sched.h 92.5 KB
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#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

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#include <uapi/linux/sched.h>
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#include <linux/sched/prio.h>

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struct sched_param {
	int sched_priority;
};

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#include <asm/param.h>	/* for HZ */

#include <linux/capability.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
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#include <linux/plist.h>
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#include <linux/rbtree.h>
#include <linux/thread_info.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/nodemask.h>
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#include <linux/mm_types.h>
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#include <linux/preempt.h>
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#include <asm/page.h>
#include <asm/ptrace.h>
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#include <linux/cputime.h>
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#include <linux/smp.h>
#include <linux/sem.h>
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#include <linux/shm.h>
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#include <linux/signal.h>
#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/pid.h>
#include <linux/percpu.h>
#include <linux/topology.h>
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#include <linux/proportions.h>
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#include <linux/seccomp.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist.h>
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#include <linux/rtmutex.h>
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#include <linux/time.h>
#include <linux/param.h>
#include <linux/resource.h>
#include <linux/timer.h>
#include <linux/hrtimer.h>
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#include <linux/kcov.h>
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#include <linux/task_io_accounting.h>
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#include <linux/latencytop.h>
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#include <linux/cred.h>
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#include <linux/llist.h>
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#include <linux/uidgid.h>
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#include <linux/gfp.h>
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#include <linux/magic.h>
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#include <linux/cgroup-defs.h>
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#include <asm/processor.h>
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#define SCHED_ATTR_SIZE_VER0	48	/* sizeof first published struct */

/*
 * Extended scheduling parameters data structure.
 *
 * This is needed because the original struct sched_param can not be
 * altered without introducing ABI issues with legacy applications
 * (e.g., in sched_getparam()).
 *
 * However, the possibility of specifying more than just a priority for
 * the tasks may be useful for a wide variety of application fields, e.g.,
 * multimedia, streaming, automation and control, and many others.
 *
 * This variant (sched_attr) is meant at describing a so-called
 * sporadic time-constrained task. In such model a task is specified by:
 *  - the activation period or minimum instance inter-arrival time;
 *  - the maximum (or average, depending on the actual scheduling
 *    discipline) computation time of all instances, a.k.a. runtime;
 *  - the deadline (relative to the actual activation time) of each
 *    instance.
 * Very briefly, a periodic (sporadic) task asks for the execution of
 * some specific computation --which is typically called an instance--
 * (at most) every period. Moreover, each instance typically lasts no more
 * than the runtime and must be completed by time instant t equal to
 * the instance activation time + the deadline.
 *
 * This is reflected by the actual fields of the sched_attr structure:
 *
 *  @size		size of the structure, for fwd/bwd compat.
 *
 *  @sched_policy	task's scheduling policy
 *  @sched_flags	for customizing the scheduler behaviour
 *  @sched_nice		task's nice value      (SCHED_NORMAL/BATCH)
 *  @sched_priority	task's static priority (SCHED_FIFO/RR)
 *  @sched_deadline	representative of the task's deadline
 *  @sched_runtime	representative of the task's runtime
 *  @sched_period	representative of the task's period
 *
 * Given this task model, there are a multiplicity of scheduling algorithms
 * and policies, that can be used to ensure all the tasks will make their
 * timing constraints.
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 *
 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
 * only user of this new interface. More information about the algorithm
 * available in the scheduling class file or in Documentation/.
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 */
struct sched_attr {
	u32 size;

	u32 sched_policy;
	u64 sched_flags;

	/* SCHED_NORMAL, SCHED_BATCH */
	s32 sched_nice;

	/* SCHED_FIFO, SCHED_RR */
	u32 sched_priority;

	/* SCHED_DEADLINE */
	u64 sched_runtime;
	u64 sched_deadline;
	u64 sched_period;
};

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struct futex_pi_state;
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struct robust_list_head;
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struct bio_list;
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struct fs_struct;
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struct perf_event_context;
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struct blk_plug;
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struct filename;
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struct nameidata;
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#define VMACACHE_BITS 2
#define VMACACHE_SIZE (1U << VMACACHE_BITS)
#define VMACACHE_MASK (VMACACHE_SIZE - 1)

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/*
 * These are the constant used to fake the fixed-point load-average
 * counting. Some notes:
 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 *    a load-average precision of 10 bits integer + 11 bits fractional
 *  - if you want to count load-averages more often, you need more
 *    precision, or rounding will get you. With 2-second counting freq,
 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 *    11 bit fractions.
 */
extern unsigned long avenrun[];		/* Load averages */
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extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
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#define FSHIFT		11		/* nr of bits of precision */
#define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */
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#define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */
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#define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
#define EXP_5		2014		/* 1/exp(5sec/5min) */
#define EXP_15		2037		/* 1/exp(5sec/15min) */

#define CALC_LOAD(load,exp,n) \
	load *= exp; \
	load += n*(FIXED_1-exp); \
	load >>= FSHIFT;

extern unsigned long total_forks;
extern int nr_threads;
DECLARE_PER_CPU(unsigned long, process_counts);
extern int nr_processes(void);
extern unsigned long nr_running(void);
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extern bool single_task_running(void);
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extern unsigned long nr_iowait(void);
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extern unsigned long nr_iowait_cpu(int cpu);
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extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
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extern void calc_global_load(unsigned long ticks);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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extern void update_cpu_load_nohz(int active);
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#else
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static inline void update_cpu_load_nohz(int active) { }
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#endif
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extern void dump_cpu_task(int cpu);

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struct seq_file;
struct cfs_rq;
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struct task_group;
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#ifdef CONFIG_SCHED_DEBUG
extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
extern void proc_sched_set_task(struct task_struct *p);
#endif
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/*
 * Task state bitmask. NOTE! These bits are also
 * encoded in fs/proc/array.c: get_task_state().
 *
 * We have two separate sets of flags: task->state
 * is about runnability, while task->exit_state are
 * about the task exiting. Confusing, but this way
 * modifying one set can't modify the other one by
 * mistake.
 */
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#define TASK_RUNNING		0
#define TASK_INTERRUPTIBLE	1
#define TASK_UNINTERRUPTIBLE	2
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#define __TASK_STOPPED		4
#define __TASK_TRACED		8
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/* in tsk->exit_state */
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#define EXIT_DEAD		16
#define EXIT_ZOMBIE		32
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#define EXIT_TRACE		(EXIT_ZOMBIE | EXIT_DEAD)
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/* in tsk->state again */
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#define TASK_DEAD		64
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#define TASK_WAKEKILL		128
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#define TASK_WAKING		256
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#define TASK_PARKED		512
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#define TASK_NOLOAD		1024
#define TASK_STATE_MAX		2048
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#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPN"
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extern char ___assert_task_state[1 - 2*!!(
		sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
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/* Convenience macros for the sake of set_task_state */
#define TASK_KILLABLE		(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
#define TASK_STOPPED		(TASK_WAKEKILL | __TASK_STOPPED)
#define TASK_TRACED		(TASK_WAKEKILL | __TASK_TRACED)
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#define TASK_IDLE		(TASK_UNINTERRUPTIBLE | TASK_NOLOAD)

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/* Convenience macros for the sake of wake_up */
#define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
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#define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
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/* get_task_state() */
#define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \
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				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
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				 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
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#define task_is_traced(task)	((task->state & __TASK_TRACED) != 0)
#define task_is_stopped(task)	((task->state & __TASK_STOPPED) != 0)
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#define task_is_stopped_or_traced(task)	\
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			((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
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#define task_contributes_to_load(task)	\
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				((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
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				 (task->flags & PF_FROZEN) == 0 && \
				 (task->state & TASK_NOLOAD) == 0)
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP

#define __set_task_state(tsk, state_value)			\
	do {							\
		(tsk)->task_state_change = _THIS_IP_;		\
		(tsk)->state = (state_value);			\
	} while (0)
#define set_task_state(tsk, state_value)			\
	do {							\
		(tsk)->task_state_change = _THIS_IP_;		\
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		smp_store_mb((tsk)->state, (state_value));		\
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	} while (0)

/*
 * set_current_state() includes a barrier so that the write of current->state
 * is correctly serialised wrt the caller's subsequent test of whether to
 * actually sleep:
 *
 *	set_current_state(TASK_UNINTERRUPTIBLE);
 *	if (do_i_need_to_sleep())
 *		schedule();
 *
 * If the caller does not need such serialisation then use __set_current_state()
 */
#define __set_current_state(state_value)			\
	do {							\
		current->task_state_change = _THIS_IP_;		\
		current->state = (state_value);			\
	} while (0)
#define set_current_state(state_value)				\
	do {							\
		current->task_state_change = _THIS_IP_;		\
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		smp_store_mb(current->state, (state_value));		\
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	} while (0)

#else

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#define __set_task_state(tsk, state_value)		\
	do { (tsk)->state = (state_value); } while (0)
#define set_task_state(tsk, state_value)		\
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	smp_store_mb((tsk)->state, (state_value))
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/*
 * set_current_state() includes a barrier so that the write of current->state
 * is correctly serialised wrt the caller's subsequent test of whether to
 * actually sleep:
 *
 *	set_current_state(TASK_UNINTERRUPTIBLE);
 *	if (do_i_need_to_sleep())
 *		schedule();
 *
 * If the caller does not need such serialisation then use __set_current_state()
 */
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#define __set_current_state(state_value)		\
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	do { current->state = (state_value); } while (0)
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#define set_current_state(state_value)			\
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	smp_store_mb(current->state, (state_value))
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#endif

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/* Task command name length */
#define TASK_COMM_LEN 16

#include <linux/spinlock.h>

/*
 * This serializes "schedule()" and also protects
 * the run-queue from deletions/modifications (but
 * _adding_ to the beginning of the run-queue has
 * a separate lock).
 */
extern rwlock_t tasklist_lock;
extern spinlock_t mmlist_lock;

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struct task_struct;
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#ifdef CONFIG_PROVE_RCU
extern int lockdep_tasklist_lock_is_held(void);
#endif /* #ifdef CONFIG_PROVE_RCU */

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extern void sched_init(void);
extern void sched_init_smp(void);
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extern asmlinkage void schedule_tail(struct task_struct *prev);
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extern void init_idle(struct task_struct *idle, int cpu);
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extern void init_idle_bootup_task(struct task_struct *idle);
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extern cpumask_var_t cpu_isolated_map;

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extern int runqueue_is_locked(int cpu);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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extern void nohz_balance_enter_idle(int cpu);
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extern void set_cpu_sd_state_idle(void);
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extern int get_nohz_timer_target(void);
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#else
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static inline void nohz_balance_enter_idle(int cpu) { }
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static inline void set_cpu_sd_state_idle(void) { }
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#endif
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/*
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 * Only dump TASK_* tasks. (0 for all tasks)
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 */
extern void show_state_filter(unsigned long state_filter);

static inline void show_state(void)
{
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	show_state_filter(0);
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}

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extern void show_regs(struct pt_regs *);

/*
 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 * task), SP is the stack pointer of the first frame that should be shown in the back
 * trace (or NULL if the entire call-chain of the task should be shown).
 */
extern void show_stack(struct task_struct *task, unsigned long *sp);

extern void cpu_init (void);
extern void trap_init(void);
extern void update_process_times(int user);
extern void scheduler_tick(void);

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extern void sched_show_task(struct task_struct *p);

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#ifdef CONFIG_LOCKUP_DETECTOR
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extern void touch_softlockup_watchdog_sched(void);
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extern void touch_softlockup_watchdog(void);
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extern void touch_softlockup_watchdog_sync(void);
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extern void touch_all_softlockup_watchdogs(void);
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extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
				  void __user *buffer,
				  size_t *lenp, loff_t *ppos);
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extern unsigned int  softlockup_panic;
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extern unsigned int  hardlockup_panic;
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void lockup_detector_init(void);
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#else
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static inline void touch_softlockup_watchdog_sched(void)
{
}
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static inline void touch_softlockup_watchdog(void)
{
}
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static inline void touch_softlockup_watchdog_sync(void)
{
}
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static inline void touch_all_softlockup_watchdogs(void)
{
}
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static inline void lockup_detector_init(void)
{
}
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#endif

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#ifdef CONFIG_DETECT_HUNG_TASK
void reset_hung_task_detector(void);
#else
static inline void reset_hung_task_detector(void)
{
}
#endif

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/* Attach to any functions which should be ignored in wchan output. */
#define __sched		__attribute__((__section__(".sched.text")))
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/* Linker adds these: start and end of __sched functions */
extern char __sched_text_start[], __sched_text_end[];

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/* Is this address in the __sched functions? */
extern int in_sched_functions(unsigned long addr);

#define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
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extern signed long schedule_timeout(signed long timeout);
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extern signed long schedule_timeout_interruptible(signed long timeout);
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extern signed long schedule_timeout_killable(signed long timeout);
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extern signed long schedule_timeout_uninterruptible(signed long timeout);
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extern signed long schedule_timeout_idle(signed long timeout);
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asmlinkage void schedule(void);
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extern void schedule_preempt_disabled(void);
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extern long io_schedule_timeout(long timeout);

static inline void io_schedule(void)
{
	io_schedule_timeout(MAX_SCHEDULE_TIMEOUT);
}

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struct nsproxy;
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struct user_namespace;
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#ifdef CONFIG_MMU
extern void arch_pick_mmap_layout(struct mm_struct *mm);
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extern unsigned long
arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
		       unsigned long, unsigned long);
extern unsigned long
arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
			  unsigned long len, unsigned long pgoff,
			  unsigned long flags);
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#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
#endif
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#define SUID_DUMP_DISABLE	0	/* No setuid dumping */
#define SUID_DUMP_USER		1	/* Dump as user of process */
#define SUID_DUMP_ROOT		2	/* Dump as root */

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/* mm flags */
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/* for SUID_DUMP_* above */
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#define MMF_DUMPABLE_BITS 2
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#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
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extern void set_dumpable(struct mm_struct *mm, int value);
/*
 * This returns the actual value of the suid_dumpable flag. For things
 * that are using this for checking for privilege transitions, it must
 * test against SUID_DUMP_USER rather than treating it as a boolean
 * value.
 */
static inline int __get_dumpable(unsigned long mm_flags)
{
	return mm_flags & MMF_DUMPABLE_MASK;
}

static inline int get_dumpable(struct mm_struct *mm)
{
	return __get_dumpable(mm->flags);
}

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/* coredump filter bits */
#define MMF_DUMP_ANON_PRIVATE	2
#define MMF_DUMP_ANON_SHARED	3
#define MMF_DUMP_MAPPED_PRIVATE	4
#define MMF_DUMP_MAPPED_SHARED	5
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#define MMF_DUMP_ELF_HEADERS	6
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#define MMF_DUMP_HUGETLB_PRIVATE 7
#define MMF_DUMP_HUGETLB_SHARED  8
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#define MMF_DUMP_DAX_PRIVATE	9
#define MMF_DUMP_DAX_SHARED	10
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#define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS
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#define MMF_DUMP_FILTER_BITS	9
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#define MMF_DUMP_FILTER_MASK \
	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
#define MMF_DUMP_FILTER_DEFAULT \
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	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\
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	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)

#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
# define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
#else
# define MMF_DUMP_MASK_DEFAULT_ELF	0
#endif
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					/* leave room for more dump flags */
#define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */
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#define MMF_VM_HUGEPAGE		17	/* set when VM_HUGEPAGE is set on vma */
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#define MMF_EXE_FILE_CHANGED	18	/* see prctl_set_mm_exe_file() */
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#define MMF_HAS_UPROBES		19	/* has uprobes */
#define MMF_RECALC_UPROBES	20	/* MMF_HAS_UPROBES can be wrong */
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#define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
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struct sighand_struct {
	atomic_t		count;
	struct k_sigaction	action[_NSIG];
	spinlock_t		siglock;
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	wait_queue_head_t	signalfd_wqh;
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};

524
struct pacct_struct {
525 526
	int			ac_flag;
	long			ac_exitcode;
527
	unsigned long		ac_mem;
528 529
	cputime_t		ac_utime, ac_stime;
	unsigned long		ac_minflt, ac_majflt;
530 531
};

532 533 534
struct cpu_itimer {
	cputime_t expires;
	cputime_t incr;
535 536
	u32 error;
	u32 incr_error;
537 538
};

539
/**
540
 * struct prev_cputime - snaphsot of system and user cputime
541 542
 * @utime: time spent in user mode
 * @stime: time spent in system mode
543
 * @lock: protects the above two fields
544
 *
545 546
 * Stores previous user/system time values such that we can guarantee
 * monotonicity.
547
 */
548 549
struct prev_cputime {
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
550 551
	cputime_t utime;
	cputime_t stime;
552 553
	raw_spinlock_t lock;
#endif
554 555
};

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static inline void prev_cputime_init(struct prev_cputime *prev)
{
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	prev->utime = prev->stime = 0;
	raw_spin_lock_init(&prev->lock);
#endif
}

564 565 566 567 568
/**
 * struct task_cputime - collected CPU time counts
 * @utime:		time spent in user mode, in &cputime_t units
 * @stime:		time spent in kernel mode, in &cputime_t units
 * @sum_exec_runtime:	total time spent on the CPU, in nanoseconds
569
 *
570 571 572
 * This structure groups together three kinds of CPU time that are tracked for
 * threads and thread groups.  Most things considering CPU time want to group
 * these counts together and treat all three of them in parallel.
573 574 575 576 577 578
 */
struct task_cputime {
	cputime_t utime;
	cputime_t stime;
	unsigned long long sum_exec_runtime;
};
579

580 581
/* Alternate field names when used to cache expirations. */
#define virt_exp	utime
582
#define prof_exp	stime
583 584
#define sched_exp	sum_exec_runtime

585 586
#define INIT_CPUTIME	\
	(struct task_cputime) {					\
587 588
		.utime = 0,					\
		.stime = 0,					\
589 590 591
		.sum_exec_runtime = 0,				\
	}

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/*
 * This is the atomic variant of task_cputime, which can be used for
 * storing and updating task_cputime statistics without locking.
 */
struct task_cputime_atomic {
	atomic64_t utime;
	atomic64_t stime;
	atomic64_t sum_exec_runtime;
};

#define INIT_CPUTIME_ATOMIC \
	(struct task_cputime_atomic) {				\
		.utime = ATOMIC64_INIT(0),			\
		.stime = ATOMIC64_INIT(0),			\
		.sum_exec_runtime = ATOMIC64_INIT(0),		\
	}

609
#define PREEMPT_DISABLED	(PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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/*
612 613
 * Disable preemption until the scheduler is running -- use an unconditional
 * value so that it also works on !PREEMPT_COUNT kernels.
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 *
615
 * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count().
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 */
617
#define INIT_PREEMPT_COUNT	PREEMPT_OFFSET
618

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/*
620 621
 * Initial preempt_count value; reflects the preempt_count schedule invariant
 * which states that during context switches:
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 *
623 624 625 626
 *    preempt_count() == 2*PREEMPT_DISABLE_OFFSET
 *
 * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.
 * Note: See finish_task_switch().
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 */
628
#define FORK_PREEMPT_COUNT	(2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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630
/**
631
 * struct thread_group_cputimer - thread group interval timer counts
632
 * @cputime_atomic:	atomic thread group interval timers.
633 634
 * @running:		true when there are timers running and
 *			@cputime_atomic receives updates.
635 636
 * @checking_timer:	true when a thread in the group is in the
 *			process of checking for thread group timers.
637 638
 *
 * This structure contains the version of task_cputime, above, that is
639
 * used for thread group CPU timer calculations.
640
 */
641
struct thread_group_cputimer {
642
	struct task_cputime_atomic cputime_atomic;
643
	bool running;
644
	bool checking_timer;
645 646
};

647
#include <linux/rwsem.h>
648 649
struct autogroup;

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/*
651
 * NOTE! "signal_struct" does not have its own
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 * locking, because a shared signal_struct always
 * implies a shared sighand_struct, so locking
 * sighand_struct is always a proper superset of
 * the locking of signal_struct.
 */
struct signal_struct {
658
	atomic_t		sigcnt;
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	atomic_t		live;
660
	int			nr_threads;
661
	struct list_head	thread_head;
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	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */
666
	struct task_struct	*curr_target;
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	/* shared signal handling: */
	struct sigpending	shared_pending;

	/* thread group exit support */
	int			group_exit_code;
	/* overloaded:
	 * - notify group_exit_task when ->count is equal to notify_count
	 * - everyone except group_exit_task is stopped during signal delivery
	 *   of fatal signals, group_exit_task processes the signal.
	 */
	int			notify_count;
679
	struct task_struct	*group_exit_task;
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	/* thread group stop support, overloads group_exit_code too */
	int			group_stop_count;
	unsigned int		flags; /* see SIGNAL_* flags below */

685 686 687 688 689 690 691 692 693 694 695 696
	/*
	 * PR_SET_CHILD_SUBREAPER marks a process, like a service
	 * manager, to re-parent orphan (double-forking) child processes
	 * to this process instead of 'init'. The service manager is
	 * able to receive SIGCHLD signals and is able to investigate
	 * the process until it calls wait(). All children of this
	 * process will inherit a flag if they should look for a
	 * child_subreaper process at exit.
	 */
	unsigned int		is_child_subreaper:1;
	unsigned int		has_child_subreaper:1;

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	/* POSIX.1b Interval Timers */
698 699
	int			posix_timer_id;
	struct list_head	posix_timers;
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	/* ITIMER_REAL timer for the process */
702
	struct hrtimer real_timer;
703
	struct pid *leader_pid;
704
	ktime_t it_real_incr;
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706 707 708 709 710 711
	/*
	 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
	 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
	 * values are defined to 0 and 1 respectively
	 */
	struct cpu_itimer it[2];
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713
	/*
714 715
	 * Thread group totals for process CPU timers.
	 * See thread_group_cputimer(), et al, for details.
716
	 */
717
	struct thread_group_cputimer cputimer;
718 719 720 721

	/* Earliest-expiration cache. */
	struct task_cputime cputime_expires;

722 723 724 725
#ifdef CONFIG_NO_HZ_FULL
	unsigned long tick_dep_mask;
#endif

726 727
	struct list_head cpu_timers[3];

728
	struct pid *tty_old_pgrp;
729

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	/* boolean value for session group leader */
	int leader;

	struct tty_struct *tty; /* NULL if no tty */

735 736 737
#ifdef CONFIG_SCHED_AUTOGROUP
	struct autogroup *autogroup;
#endif
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	/*
	 * Cumulative resource counters for dead threads in the group,
	 * and for reaped dead child processes forked by this group.
	 * Live threads maintain their own counters and add to these
	 * in __exit_signal, except for the group leader.
	 */
744
	seqlock_t stats_lock;
745
	cputime_t utime, stime, cutime, cstime;
746 747
	cputime_t gtime;
	cputime_t cgtime;
748
	struct prev_cputime prev_cputime;
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	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
751
	unsigned long inblock, oublock, cinblock, coublock;
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	unsigned long maxrss, cmaxrss;
753
	struct task_io_accounting ioac;
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755 756 757 758 759 760 761 762
	/*
	 * Cumulative ns of schedule CPU time fo dead threads in the
	 * group, not including a zombie group leader, (This only differs
	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
	 * other than jiffies.)
	 */
	unsigned long long sum_sched_runtime;

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	/*
	 * We don't bother to synchronize most readers of this at all,
	 * because there is no reader checking a limit that actually needs
	 * to get both rlim_cur and rlim_max atomically, and either one
	 * alone is a single word that can safely be read normally.
	 * getrlimit/setrlimit use task_lock(current->group_leader) to
	 * protect this instead of the siglock, because they really
	 * have no need to disable irqs.
	 */
	struct rlimit rlim[RLIM_NLIMITS];

774 775 776
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct pacct_struct pacct;	/* per-process accounting information */
#endif
777 778 779
#ifdef CONFIG_TASKSTATS
	struct taskstats *stats;
#endif
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#ifdef CONFIG_AUDIT
	unsigned audit_tty;
	struct tty_audit_buf *tty_audit_buf;
#endif
784

785
	oom_flags_t oom_flags;
786 787 788
	short oom_score_adj;		/* OOM kill score adjustment */
	short oom_score_adj_min;	/* OOM kill score adjustment min value.
					 * Only settable by CAP_SYS_RESOURCE. */
789 790 791 792

	struct mutex cred_guard_mutex;	/* guard against foreign influences on
					 * credential calculations
					 * (notably. ptrace) */
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};

/*
 * Bits in flags field of signal_struct.
 */
#define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */
799 800
#define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */
801
#define SIGNAL_GROUP_COREDUMP	0x00000008 /* coredump in progress */
802 803 804 805 806 807
/*
 * Pending notifications to parent.
 */
#define SIGNAL_CLD_STOPPED	0x00000010
#define SIGNAL_CLD_CONTINUED	0x00000020
#define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
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809 810
#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

811 812 813 814 815 816 817
/* If true, all threads except ->group_exit_task have pending SIGKILL */
static inline int signal_group_exit(const struct signal_struct *sig)
{
	return	(sig->flags & SIGNAL_GROUP_EXIT) ||
		(sig->group_exit_task != NULL);
}

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/*
 * Some day this will be a full-fledged user tracking system..
 */
struct user_struct {
	atomic_t __count;	/* reference count */
	atomic_t processes;	/* How many processes does this user have? */
	atomic_t sigpending;	/* How many pending signals does this user have? */
825
#ifdef CONFIG_INOTIFY_USER
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	atomic_t inotify_watches; /* How many inotify watches does this user have? */
	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
#endif
829 830 831
#ifdef CONFIG_FANOTIFY
	atomic_t fanotify_listeners;
#endif
832
#ifdef CONFIG_EPOLL
833
	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
834
#endif
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#ifdef CONFIG_POSIX_MQUEUE
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836 837
	/* protected by mq_lock	*/
	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
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#endif
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	unsigned long locked_shm; /* How many pages of mlocked shm ? */
840
	unsigned long unix_inflight;	/* How many files in flight in unix sockets */
841
	atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
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#ifdef CONFIG_KEYS
	struct key *uid_keyring;	/* UID specific keyring */
	struct key *session_keyring;	/* UID's default session keyring */
#endif

	/* Hash table maintenance information */
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	struct hlist_node uidhash_node;
850
	kuid_t uid;
851

852
#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
853 854
	atomic_long_t locked_vm;
#endif
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};

857
extern int uids_sysfs_init(void);
858

859
extern struct user_struct *find_user(kuid_t);
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extern struct user_struct root_user;
#define INIT_USER (&root_user)

864

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struct backing_dev_info;
struct reclaim_state;

868
#ifdef CONFIG_SCHED_INFO
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struct sched_info {
	/* cumulative counters */
871
	unsigned long pcount;	      /* # of times run on this cpu */
872
	unsigned long long run_delay; /* time spent waiting on a runqueue */
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	/* timestamps */
875 876
	unsigned long long last_arrival,/* when we last ran on a cpu */
			   last_queued;	/* when we were last queued to run */
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};
878
#endif /* CONFIG_SCHED_INFO */
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880 881 882 883 884 885 886 887 888 889 890 891 892 893
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info {
	spinlock_t	lock;
	unsigned int	flags;	/* Private per-task flags */

	/* For each stat XXX, add following, aligned appropriately
	 *
	 * struct timespec XXX_start, XXX_end;
	 * u64 XXX_delay;
	 * u32 XXX_count;
	 *
	 * Atomicity of updates to XXX_delay, XXX_count protected by
	 * single lock above (split into XXX_lock if contention is an issue).
	 */
894 895 896 897 898 899

	/*
	 * XXX_count is incremented on every XXX operation, the delay
	 * associated with the operation is added to XXX_delay.
	 * XXX_delay contains the accumulated delay time in nanoseconds.
	 */
900
	u64 blkio_start;	/* Shared by blkio, swapin */
901 902 903 904 905 906
	u64 blkio_delay;	/* wait for sync block io completion */
	u64 swapin_delay;	/* wait for swapin block io completion */
	u32 blkio_count;	/* total count of the number of sync block */
				/* io operations performed */
	u32 swapin_count;	/* total count of the number of swapin block */
				/* io operations performed */
907

908
	u64 freepages_start;
909 910
	u64 freepages_delay;	/* wait for memory reclaim */
	u32 freepages_count;	/* total count of memory reclaim */
911
};
912 913 914 915 916 917 918 919 920 921 922
#endif	/* CONFIG_TASK_DELAY_ACCT */

static inline int sched_info_on(void)
{
#ifdef CONFIG_SCHEDSTATS
	return 1;
#elif defined(CONFIG_TASK_DELAY_ACCT)
	extern int delayacct_on;
	return delayacct_on;
#else
	return 0;
923
#endif
924
}
925

926 927 928 929
#ifdef CONFIG_SCHEDSTATS
void force_schedstat_enabled(void);
#endif

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enum cpu_idle_type {
	CPU_IDLE,
	CPU_NOT_IDLE,
	CPU_NEWLY_IDLE,
	CPU_MAX_IDLE_TYPES
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};

937
/*
938
 * Increase resolution of cpu_capacity calculations
939
 */
940 941
#define SCHED_CAPACITY_SHIFT	10
#define SCHED_CAPACITY_SCALE	(1L << SCHED_CAPACITY_SHIFT)
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943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
/*
 * Wake-queues are lists of tasks with a pending wakeup, whose
 * callers have already marked the task as woken internally,
 * and can thus carry on. A common use case is being able to
 * do the wakeups once the corresponding user lock as been
 * released.
 *
 * We hold reference to each task in the list across the wakeup,
 * thus guaranteeing that the memory is still valid by the time
 * the actual wakeups are performed in wake_up_q().
 *
 * One per task suffices, because there's never a need for a task to be
 * in two wake queues simultaneously; it is forbidden to abandon a task
 * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
 * already in a wake queue, the wakeup will happen soon and the second
 * waker can just skip it.
 *
 * The WAKE_Q macro declares and initializes the list head.
 * wake_up_q() does NOT reinitialize the list; it's expected to be
 * called near the end of a function, where the fact that the queue is
 * not used again will be easy to see by inspection.
 *
 * Note that this can cause spurious wakeups. schedule() callers
 * must ensure the call is done inside a loop, confirming that the
 * wakeup condition has in fact occurred.
 */
struct wake_q_node {
	struct wake_q_node *next;
};

struct wake_q_head {
	struct wake_q_node *first;
	struct wake_q_node **lastp;
};

#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)

#define WAKE_Q(name)					\
	struct wake_q_head name = { WAKE_Q_TAIL, &name.first }

extern void wake_q_add(struct wake_q_head *head,
		       struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);

987 988 989
/*
 * sched-domains (multiprocessor balancing) declarations:
 */
990
#ifdef CONFIG_SMP
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#define SD_LOAD_BALANCE		0x0001	/* Do load balancing on this domain. */
#define SD_BALANCE_NEWIDLE	0x0002	/* Balance when about to become idle */
#define SD_BALANCE_EXEC		0x0004	/* Balance on exec */
#define SD_BALANCE_FORK		0x0008	/* Balance on fork, clone */
995
#define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */
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#define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */
997
#define SD_SHARE_CPUCAPACITY	0x0080	/* Domain members share cpu power */
998
#define SD_SHARE_POWERDOMAIN	0x0100	/* Domain members share power domain */
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#define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
#define SD_SERIALIZE		0x0400	/* Only a single load balancing instance */
1001
#define SD_ASYM_PACKING		0x0800  /* Place busy groups earlier in the domain */
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#define SD_PREFER_SIBLING	0x1000	/* Prefer to place tasks in a sibling domain */
1003
#define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */
1004
#define SD_NUMA			0x4000	/* cross-node balancing */
1005

1006
#ifdef CONFIG_SCHED_SMT
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static inline int cpu_smt_flags(void)
1008
{
1009
	return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
1010 1011 1012 1013
}
#endif

#ifdef CONFIG_SCHED_MC
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static inline int cpu_core_flags(void)
1015 1016 1017 1018 1019 1020
{
	return SD_SHARE_PKG_RESOURCES;
}
#endif

#ifdef CONFIG_NUMA
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static inline int cpu_numa_flags(void)
1022 1023 1024 1025
{
	return SD_NUMA;
}
#endif
1026

1027 1028 1029 1030 1031 1032 1033 1034
struct sched_domain_attr {
	int relax_domain_level;
};

#define SD_ATTR_INIT	(struct sched_domain_attr) {	\
	.relax_domain_level = -1,			\
}

1035 1036
extern int sched_domain_level_max;

1037 1038
struct sched_group;

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struct sched_domain {
	/* These fields must be setup */
	struct sched_domain *parent;	/* top domain must be null terminated */
1042
	struct sched_domain *child;	/* bottom domain must be null terminated */
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	struct sched_group *groups;	/* the balancing groups of the domain */
	unsigned long min_interval;	/* Minimum balance interval ms */
	unsigned long max_interval;	/* Maximum balance interval ms */
	unsigned int busy_factor;	/* less balancing by factor if busy */
	unsigned int imbalance_pct;	/* No balance until over watermark */
	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */
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	unsigned int busy_idx;
	unsigned int idle_idx;
	unsigned int newidle_idx;
	unsigned int wake_idx;
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	unsigned int forkexec_idx;
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	unsigned int smt_gain;
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	int nohz_idle;			/* NOHZ IDLE status */
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	int flags;			/* See SD_* */
1058
	int level;
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	/* Runtime fields. */
	unsigned long last_balance;	/* init to jiffies. units in jiffies */
	unsigned int balance_interval;	/* initialise to 1. units in ms. */
	unsigned int nr_balance_failed; /* initialise to 0 */

1065
	/* idle_balance() stats */
1066
	u64 max_newidle_lb_cost;
1067
	unsigned long next_decay_max_lb_cost;
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#ifdef CONFIG_SCHEDSTATS
	/* load_balance() stats */
1071 1072 1073 1074 1075 1076 1077 1078
	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
	unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
	unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
	unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
	unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
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	/* Active load balancing */
1081 1082 1083
	unsigned int alb_count;
	unsigned int alb_failed;
	unsigned int alb_pushed;
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1085
	/* SD_BALANCE_EXEC stats */
1086 1087 1088
	unsigned int sbe_count;
	unsigned int sbe_balanced;
	unsigned int sbe_pushed;
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1090
	/* SD_BALANCE_FORK stats */
1091 1092 1093
	unsigned int sbf_count;
	unsigned int sbf_balanced;
	unsigned int sbf_pushed;
1094

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	/* try_to_wake_up() stats */
1096 1097 1098
	unsigned int ttwu_wake_remote;
	unsigned int ttwu_move_affine;
	unsigned int ttwu_move_balance;
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#endif
1100 1101 1102
#ifdef CONFIG_SCHED_DEBUG
	char *name;
#endif
1103 1104 1105 1106
	union {
		void *private;		/* used during construction */
		struct rcu_head rcu;	/* used during destruction */
	};
1107

1108
	unsigned int span_weight;
1109 1110 1111 1112 1113 1114 1115 1116
	/*
	 * Span of all CPUs in this domain.
	 *
	 * NOTE: this field is variable length. (Allocated dynamically
	 * by attaching extra space to the end of the structure,
	 * depending on how many CPUs the kernel has booted up with)
	 */
	unsigned long span[0];
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};

1119 1120
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
1121
	return to_cpumask(sd->span);
1122 1123
}

1124
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1125
				    struct sched_domain_attr *dattr_new);
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1127 1128 1129 1130
/* Allocate an array of sched domains, for partition_sched_domains(). */
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);

1131 1132
bool cpus_share_cache(int this_cpu, int that_cpu);

1133
typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
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typedef int (*sched_domain_flags_f)(void);
1135 1136 1137 1138 1139 1140

#define SDTL_OVERLAP	0x01

struct sd_data {
	struct sched_domain **__percpu sd;
	struct sched_group **__percpu sg;
1141
	struct sched_group_capacity **__percpu sgc;
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
};

struct sched_domain_topology_level {
	sched_domain_mask_f mask;
	sched_domain_flags_f sd_flags;
	int		    flags;
	int		    numa_level;
	struct sd_data      data;
#ifdef CONFIG_SCHED_DEBUG
	char                *name;
#endif
};

extern void set_sched_topology(struct sched_domain_topology_level *tl);
1156
extern void wake_up_if_idle(int cpu);
1157 1158 1159 1160 1161 1162 1163

#ifdef CONFIG_SCHED_DEBUG
# define SD_INIT_NAME(type)		.name = #type
#else
# define SD_INIT_NAME(type)
#endif

1164
#else /* CONFIG_SMP */
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1166
struct sched_domain_attr;
1167

1168
static inline void
1169
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1170 1171
			struct sched_domain_attr *dattr_new)
{
1172
}
1173 1174 1175 1176 1177 1178

static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
	return true;
}

1179
#endif	/* !CONFIG_SMP */
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1181

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struct io_context;			/* See blkdev.h */


1185
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1186
extern void prefetch_stack(struct task_struct *t);
1187 1188 1189
#else
static inline void prefetch_stack(struct task_struct *t) { }
#endif
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struct audit_context;		/* See audit.c */
struct mempolicy;
1193
struct pipe_inode_info;
1194
struct uts_namespace;
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struct load_weight {
1197 1198
	unsigned long weight;
	u32 inv_weight;
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1199 1200
};

1201 1202
/*
 * The load_avg/util_avg accumulates an infinite geometric series.
1203 1204 1205
 * 1) load_avg factors frequency scaling into the amount of time that a
 * sched_entity is runnable on a rq into its weight. For cfs_rq, it is the
 * aggregated such weights of all runnable and blocked sched_entities.
1206
 * 2) util_avg factors frequency and cpu scaling into the amount of time
1207 1208 1209 1210 1211 1212 1213 1214
 * that a sched_entity is running on a CPU, in the range [0..SCHED_LOAD_SCALE].
 * For cfs_rq, it is the aggregated such times of all runnable and
 * blocked sched_entities.
 * The 64 bit load_sum can:
 * 1) for cfs_rq, afford 4353082796 (=2^64/47742/88761) entities with
 * the highest weight (=88761) always runnable, we should not overflow
 * 2) for entity, support any load.weight always runnable
 */
1215
struct sched_avg {
1216 1217 1218
	u64 last_update_time, load_sum;
	u32 util_sum, period_contrib;
	unsigned long load_avg, util_avg;
1219 1220
};

1221
#ifdef CONFIG_SCHEDSTATS
1222
struct sched_statistics {
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1223
	u64			wait_start;
1224
	u64			wait_max;
1225 1226
	u64			wait_count;
	u64			wait_sum;
1227 1228
	u64			iowait_count;
	u64			iowait_sum;
1229

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1230 1231
	u64			sleep_start;
	u64			sleep_max;
1232 1233 1234
	s64			sum_sleep_runtime;

	u64			block_start;
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1235 1236
	u64			block_max;
	u64			exec_max;
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1237
	u64			slice_max;
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253

	u64			nr_migrations_cold;
	u64			nr_failed_migrations_affine;
	u64			nr_failed_migrations_running;
	u64			nr_failed_migrations_hot;
	u64			nr_forced_migrations;

	u64			nr_wakeups;
	u64			nr_wakeups_sync;
	u64			nr_wakeups_migrate;
	u64			nr_wakeups_local;
	u64			nr_wakeups_remote;
	u64			nr_wakeups_affine;
	u64			nr_wakeups_affine_attempts;
	u64			nr_wakeups_passive;
	u64			nr_wakeups_idle;
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
};
#endif

struct sched_entity {
	struct load_weight	load;		/* for load-balancing */
	struct rb_node		run_node;
	struct list_head	group_node;
	unsigned int		on_rq;

	u64			exec_start;
	u64			sum_exec_runtime;
	u64			vruntime;
	u64			prev_sum_exec_runtime;

	u64			nr_migrations;

#ifdef CONFIG_SCHEDSTATS
	struct sched_statistics statistics;
1272 1273
#endif

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#ifdef CONFIG_FAIR_GROUP_SCHED
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1275
	int			depth;
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1276 1277 1278 1279 1280 1281
	struct sched_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct cfs_rq		*cfs_rq;
	/* rq "owned" by this entity/group: */
	struct cfs_rq		*my_q;
#endif
1282

1283
#ifdef CONFIG_SMP
1284 1285 1286 1287 1288 1289 1290
	/*
	 * Per entity load average tracking.
	 *
	 * Put into separate cache line so it does not
	 * collide with read-mostly values above.
	 */
	struct sched_avg	avg ____cacheline_aligned_in_smp;
1291
#endif
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1292
};
1293

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1294 1295
struct sched_rt_entity {
	struct list_head run_list;
1296
	unsigned long timeout;
1297
	unsigned long watchdog_stamp;
1298
	unsigned int time_slice;
1299 1300
	unsigned short on_rq;
	unsigned short on_list;
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1301

1302
	struct sched_rt_entity *back;
1303
#ifdef CONFIG_RT_GROUP_SCHED
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1304 1305 1306 1307 1308 1309
	struct sched_rt_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct rt_rq		*rt_rq;
	/* rq "owned" by this entity/group: */
	struct rt_rq		*my_q;
#endif
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1310 1311
};

1312 1313 1314 1315 1316
struct sched_dl_entity {
	struct rb_node	rb_node;

	/*
	 * Original scheduling parameters. Copied here from sched_attr
1317 1318
	 * during sched_setattr(), they will remain the same until
	 * the next sched_setattr().
1319 1320 1321
	 */
	u64 dl_runtime;		/* maximum runtime for each instance	*/
	u64 dl_deadline;	/* relative deadline of each instance	*/
1322
	u64 dl_period;		/* separation of two instances (period) */
1323
	u64 dl_bw;		/* dl_runtime / dl_deadline		*/
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340

	/*
	 * Actual scheduling parameters. Initialized with the values above,
	 * they are continously updated during task execution. Note that
	 * the remaining runtime could be < 0 in case we are in overrun.
	 */
	s64 runtime;		/* remaining runtime for this instance	*/
	u64 deadline;		/* absolute deadline for this instance	*/
	unsigned int flags;	/* specifying the scheduler behaviour	*/

	/*
	 * Some bool flags:
	 *
	 * @dl_throttled tells if we exhausted the runtime. If so, the
	 * task has to wait for a replenishment to be performed at the
	 * next firing of dl_timer.
	 *
1341 1342
	 * @dl_boosted tells if we are boosted due to DI. If so we are
	 * outside bandwidth enforcement mechanism (but only until we
1343 1344 1345 1346
	 * exit the critical section);
	 *
	 * @dl_yielded tells if task gave up the cpu before consuming
	 * all its available runtime during the last job.
1347
	 */
1348
	int dl_throttled, dl_boosted, dl_yielded;
1349 1350 1351 1352 1353 1354 1355

	/*
	 * Bandwidth enforcement timer. Each -deadline task has its
	 * own bandwidth to be enforced, thus we need one timer per task.
	 */
	struct hrtimer dl_timer;
};
1356

1357 1358
union rcu_special {
	struct {
1359 1360 1361 1362 1363 1364
		u8 blocked;
		u8 need_qs;
		u8 exp_need_qs;
		u8 pad;	/* Otherwise the compiler can store garbage here. */
	} b; /* Bits. */
	u32 s; /* Set of bits. */
1365
};
1366 1367
struct rcu_node;

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1368 1369 1370
enum perf_event_task_context {
	perf_invalid_context = -1,
	perf_hw_context = 0,
1371
	perf_sw_context,
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1372 1373 1374
	perf_nr_task_contexts,
};

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
/* Track pages that require TLB flushes */
struct tlbflush_unmap_batch {
	/*
	 * Each bit set is a CPU that potentially has a TLB entry for one of
	 * the PFNs being flushed. See set_tlb_ubc_flush_pending().
	 */
	struct cpumask cpumask;

	/* True if any bit in cpumask is set */
	bool flush_required;
1385 1386 1387 1388 1389 1390 1391

	/*
	 * If true then the PTE was dirty when unmapped. The entry must be
	 * flushed before IO is initiated or a stale TLB entry potentially
	 * allows an update without redirtying the page.
	 */
	bool writable;
1392 1393
};

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1394 1395
struct task_struct {
	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
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1396
	void *stack;
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1397
	atomic_t usage;
1398 1399
	unsigned int flags;	/* per process flags, defined below */
	unsigned int ptrace;
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1400

1401
#ifdef CONFIG_SMP
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1402
	struct llist_node wake_entry;
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1403
	int on_cpu;
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1404
	unsigned int wakee_flips;
1405
	unsigned long wakee_flip_decay_ts;
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1406
	struct task_struct *last_wakee;
1407 1408

	int wake_cpu;
1409
#endif
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1410
	int on_rq;
1411

1412
	int prio, static_prio, normal_prio;
1413
	unsigned int rt_priority;
1414
	const struct sched_class *sched_class;
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1415
	struct sched_entity se;
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1416
	struct sched_rt_entity rt;
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1417 1418 1419
#ifdef CONFIG_CGROUP_SCHED
	struct task_group *sched_task_group;
#endif
1420
	struct sched_dl_entity dl;
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1421

1422 1423 1424 1425 1426
#ifdef CONFIG_PREEMPT_NOTIFIERS
	/* list of struct preempt_notifier: */
	struct hlist_head preempt_notifiers;
#endif

1427
#ifdef CONFIG_BLK_DEV_IO_TRACE
1428
	unsigned int btrace_seq;
1429
#endif
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1430

1431
	unsigned int policy;
1432
	int nr_cpus_allowed;
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1433 1434
	cpumask_t cpus_allowed;

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1435
#ifdef CONFIG_PREEMPT_RCU
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1436
	int rcu_read_lock_nesting;
1437
	union rcu_special rcu_read_unlock_special;
1438
	struct list_head rcu_node_entry;
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1439
	struct rcu_node *rcu_blocked_node;
1440
#endif /* #ifdef CONFIG_PREEMPT_RCU */
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1441 1442 1443 1444
#ifdef CONFIG_TASKS_RCU
	unsigned long rcu_tasks_nvcsw;
	bool rcu_tasks_holdout;
	struct list_head rcu_tasks_holdout_list;
1445
	int rcu_tasks_idle_cpu;
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1446
#endif /* #ifdef CONFIG_TASKS_RCU */
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1447

1448
#ifdef CONFIG_SCHED_INFO
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1449 1450 1451 1452
	struct sched_info sched_info;
#endif

	struct list_head tasks;
1453
#ifdef CONFIG_SMP
1454
	struct plist_node pushable_tasks;
1455
	struct rb_node pushable_dl_tasks;
1456
#endif
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1457 1458

	struct mm_struct *mm, *active_mm;
D
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1459 1460 1461
	/* per-thread vma caching */
	u32 vmacache_seqnum;
	struct vm_area_struct *vmacache[VMACACHE_SIZE];
1462 1463 1464
#if defined(SPLIT_RSS_COUNTING)
	struct task_rss_stat	rss_stat;
#endif
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1465
/* task state */
1466
	int exit_state;
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1467 1468
	int exit_code, exit_signal;
	int pdeath_signal;  /*  The signal sent when the parent dies  */
1469
	unsigned long jobctl;	/* JOBCTL_*, siglock protected */
1470 1471

	/* Used for emulating ABI behavior of previous Linux versions */
1472
	unsigned int personality;
1473

1474
	/* scheduler bits, serialized by scheduler locks */
1475
	unsigned sched_reset_on_fork:1;
1476
	unsigned sched_contributes_to_load:1;
1477
	unsigned sched_migrated:1;
1478 1479 1480 1481 1482
	unsigned :0; /* force alignment to the next boundary */

	/* unserialized, strictly 'current' */
	unsigned in_execve:1; /* bit to tell LSMs we're in execve */
	unsigned in_iowait:1;
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1483 1484
#ifdef CONFIG_MEMCG
	unsigned memcg_may_oom:1;
1485
#ifndef CONFIG_SLOB
1486 1487
	unsigned memcg_kmem_skip_account:1;
#endif
1488
#endif
1489 1490 1491
#ifdef CONFIG_COMPAT_BRK
	unsigned brk_randomized:1;
#endif
1492

1493 1494
	unsigned long atomic_flags; /* Flags needing atomic access. */

1495 1496
	struct restart_block restart_block;

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1497 1498
	pid_t pid;
	pid_t tgid;
1499

1500
#ifdef CONFIG_CC_STACKPROTECTOR
1501 1502
	/* Canary value for the -fstack-protector gcc feature */
	unsigned long stack_canary;
1503
#endif
1504
	/*
L
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1505
	 * pointers to (original) parent process, youngest child, younger sibling,
1506
	 * older sibling, respectively.  (p->father can be replaced with
R
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1507
	 * p->real_parent->pid)
L
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1508
	 */
1509 1510
	struct task_struct __rcu *real_parent; /* real parent process */
	struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
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1511
	/*
R
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1512
	 * children/sibling forms the list of my natural children
L
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1513 1514 1515 1516 1517
	 */
	struct list_head children;	/* list of my children */
	struct list_head sibling;	/* linkage in my parent's children list */
	struct task_struct *group_leader;	/* threadgroup leader */

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1518 1519 1520 1521 1522 1523 1524 1525
	/*
	 * ptraced is the list of tasks this task is using ptrace on.
	 * This includes both natural children and PTRACE_ATTACH targets.
	 * p->ptrace_entry is p's link on the p->parent->ptraced list.
	 */
	struct list_head ptraced;
	struct list_head ptrace_entry;

L
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1526
	/* PID/PID hash table linkage. */
1527
	struct pid_link pids[PIDTYPE_MAX];
O
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1528
	struct list_head thread_group;
1529
	struct list_head thread_node;
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1530 1531 1532 1533 1534

	struct completion *vfork_done;		/* for vfork() */
	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */

1535
	cputime_t utime, stime, utimescaled, stimescaled;
1536
	cputime_t gtime;
1537
	struct prev_cputime prev_cputime;
1538
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1539
	seqcount_t vtime_seqcount;
1540 1541
	unsigned long long vtime_snap;
	enum {
1542 1543 1544
		/* Task is sleeping or running in a CPU with VTIME inactive */
		VTIME_INACTIVE = 0,
		/* Task runs in userspace in a CPU with VTIME active */
1545
		VTIME_USER,
1546
		/* Task runs in kernelspace in a CPU with VTIME active */
1547 1548
		VTIME_SYS,
	} vtime_snap_whence;
1549
#endif
1550 1551 1552 1553

#ifdef CONFIG_NO_HZ_FULL
	unsigned long tick_dep_mask;
#endif
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	unsigned long nvcsw, nivcsw; /* context switch counts */
1555
	u64 start_time;		/* monotonic time in nsec */
1556
	u64 real_start_time;	/* boot based time in nsec */
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1557 1558 1559
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
	unsigned long min_flt, maj_flt;

1560
	struct task_cputime cputime_expires;
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1561 1562 1563
	struct list_head cpu_timers[3];

/* process credentials */
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1564
	const struct cred __rcu *real_cred; /* objective and real subjective task
1565
					 * credentials (COW) */
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1566
	const struct cred __rcu *cred;	/* effective (overridable) subjective task
1567
					 * credentials (COW) */
1568 1569 1570
	char comm[TASK_COMM_LEN]; /* executable name excluding path
				     - access with [gs]et_task_comm (which lock
				       it with task_lock())
1571
				     - initialized normally by setup_new_exec */
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1572
/* file system info */
1573
	struct nameidata *nameidata;
1574
#ifdef CONFIG_SYSVIPC
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1575 1576
/* ipc stuff */
	struct sysv_sem sysvsem;
1577
	struct sysv_shm sysvshm;
1578
#endif
1579
#ifdef CONFIG_DETECT_HUNG_TASK
1580 1581 1582
/* hung task detection */
	unsigned long last_switch_count;
#endif
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1583 1584 1585 1586
/* filesystem information */
	struct fs_struct *fs;
/* open file information */
	struct files_struct *files;
1587
/* namespaces */
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1588
	struct nsproxy *nsproxy;
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1589 1590 1591 1592 1593
/* signal handlers */
	struct signal_struct *signal;
	struct sighand_struct *sighand;

	sigset_t blocked, real_blocked;
1594
	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
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1595 1596 1597 1598
	struct sigpending pending;

	unsigned long sas_ss_sp;
	size_t sas_ss_size;
1599

1600
	struct callback_head *task_works;
1601

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1602
	struct audit_context *audit_context;
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1603
#ifdef CONFIG_AUDITSYSCALL
1604
	kuid_t loginuid;
1605
	unsigned int sessionid;
A
Al Viro 已提交
1606
#endif
1607
	struct seccomp seccomp;
L
Linus Torvalds 已提交
1608 1609 1610 1611

/* Thread group tracking */
   	u32 parent_exec_id;
   	u32 self_exec_id;
1612 1613
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
 * mempolicy */
L
Linus Torvalds 已提交
1614 1615
	spinlock_t alloc_lock;

1616
	/* Protection of the PI data structures: */
1617
	raw_spinlock_t pi_lock;
1618

1619 1620
	struct wake_q_node wake_q;

I
Ingo Molnar 已提交
1621 1622
#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task */
1623 1624
	struct rb_root pi_waiters;
	struct rb_node *pi_waiters_leftmost;
I
Ingo Molnar 已提交
1625 1626 1627 1628
	/* Deadlock detection and priority inheritance handling */
	struct rt_mutex_waiter *pi_blocked_on;
#endif

1629 1630 1631 1632
#ifdef CONFIG_DEBUG_MUTEXES
	/* mutex deadlock detection */
	struct mutex_waiter *blocked_on;
#endif
1633 1634 1635 1636
#ifdef CONFIG_TRACE_IRQFLAGS
	unsigned int irq_events;
	unsigned long hardirq_enable_ip;
	unsigned long hardirq_disable_ip;
1637
	unsigned int hardirq_enable_event;
1638
	unsigned int hardirq_disable_event;
1639 1640
	int hardirqs_enabled;
	int hardirq_context;
1641 1642
	unsigned long softirq_disable_ip;
	unsigned long softirq_enable_ip;
1643
	unsigned int softirq_disable_event;
1644
	unsigned int softirq_enable_event;
1645
	int softirqs_enabled;
1646 1647
	int softirq_context;
#endif
I
Ingo Molnar 已提交
1648
#ifdef CONFIG_LOCKDEP
1649
# define MAX_LOCK_DEPTH 48UL
I
Ingo Molnar 已提交
1650 1651 1652
	u64 curr_chain_key;
	int lockdep_depth;
	unsigned int lockdep_recursion;
1653
	struct held_lock held_locks[MAX_LOCK_DEPTH];
1654
	gfp_t lockdep_reclaim_gfp;
I
Ingo Molnar 已提交
1655
#endif
1656 1657 1658
#ifdef CONFIG_UBSAN
	unsigned int in_ubsan;
#endif
1659

L
Linus Torvalds 已提交
1660 1661 1662
/* journalling filesystem info */
	void *journal_info;

1663
/* stacked block device info */
1664
	struct bio_list *bio_list;
1665

1666 1667 1668 1669 1670
#ifdef CONFIG_BLOCK
/* stack plugging */
	struct blk_plug *plug;
#endif

L
Linus Torvalds 已提交
1671 1672 1673 1674 1675 1676 1677 1678 1679
/* VM state */
	struct reclaim_state *reclaim_state;

	struct backing_dev_info *backing_dev_info;

	struct io_context *io_context;

	unsigned long ptrace_message;
	siginfo_t *last_siginfo; /* For ptrace use.  */
1680
	struct task_io_accounting ioac;
1681
#if defined(CONFIG_TASK_XACCT)
L
Linus Torvalds 已提交
1682 1683
	u64 acct_rss_mem1;	/* accumulated rss usage */
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
1684
	cputime_t acct_timexpd;	/* stime + utime since last update */
L
Linus Torvalds 已提交
1685 1686
#endif
#ifdef CONFIG_CPUSETS
1687
	nodemask_t mems_allowed;	/* Protected by alloc_lock */
1688
	seqcount_t mems_allowed_seq;	/* Seqence no to catch updates */
1689
	int cpuset_mem_spread_rotor;
1690
	int cpuset_slab_spread_rotor;
L
Linus Torvalds 已提交
1691
#endif
1692
#ifdef CONFIG_CGROUPS
1693
	/* Control Group info protected by css_set_lock */
A
Arnd Bergmann 已提交
1694
	struct css_set __rcu *cgroups;
1695 1696
	/* cg_list protected by css_set_lock and tsk->alloc_lock */
	struct list_head cg_list;
1697
#endif
1698
#ifdef CONFIG_FUTEX
1699
	struct robust_list_head __user *robust_list;
1700 1701 1702
#ifdef CONFIG_COMPAT
	struct compat_robust_list_head __user *compat_robust_list;
#endif
1703 1704
	struct list_head pi_state_list;
	struct futex_pi_state *pi_state_cache;
1705
#endif
1706
#ifdef CONFIG_PERF_EVENTS
P
Peter Zijlstra 已提交
1707
	struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1708 1709
	struct mutex perf_event_mutex;
	struct list_head perf_event_list;
1710
#endif
1711 1712 1713
#ifdef CONFIG_DEBUG_PREEMPT
	unsigned long preempt_disable_ip;
#endif
1714
#ifdef CONFIG_NUMA
1715
	struct mempolicy *mempolicy;	/* Protected by alloc_lock */
1716
	short il_next;
1717
	short pref_node_fork;
1718
#endif
1719 1720 1721
#ifdef CONFIG_NUMA_BALANCING
	int numa_scan_seq;
	unsigned int numa_scan_period;
1722
	unsigned int numa_scan_period_max;
1723
	int numa_preferred_nid;
1724
	unsigned long numa_migrate_retry;
1725
	u64 node_stamp;			/* migration stamp  */
1726 1727
	u64 last_task_numa_placement;
	u64 last_sum_exec_runtime;
1728
	struct callback_head numa_work;
1729

1730 1731 1732
	struct list_head numa_entry;
	struct numa_group *numa_group;

1733
	/*
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745
	 * numa_faults is an array split into four regions:
	 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
	 * in this precise order.
	 *
	 * faults_memory: Exponential decaying average of faults on a per-node
	 * basis. Scheduling placement decisions are made based on these
	 * counts. The values remain static for the duration of a PTE scan.
	 * faults_cpu: Track the nodes the process was running on when a NUMA
	 * hinting fault was incurred.
	 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
	 * during the current scan window. When the scan completes, the counts
	 * in faults_memory and faults_cpu decay and these values are copied.
1746
	 */
1747
	unsigned long *numa_faults;
1748
	unsigned long total_numa_faults;
1749

1750 1751
	/*
	 * numa_faults_locality tracks if faults recorded during the last
1752 1753 1754
	 * scan window were remote/local or failed to migrate. The task scan
	 * period is adapted based on the locality of the faults with different
	 * weights depending on whether they were shared or private faults
1755
	 */
1756
	unsigned long numa_faults_locality[3];
1757

I
Ingo Molnar 已提交
1758
	unsigned long numa_pages_migrated;
1759 1760
#endif /* CONFIG_NUMA_BALANCING */

1761 1762 1763 1764
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
	struct tlbflush_unmap_batch tlb_ubc;
#endif

I
Ingo Molnar 已提交
1765
	struct rcu_head rcu;
1766 1767 1768 1769 1770

	/*
	 * cache last used pipe for splice
	 */
	struct pipe_inode_info *splice_pipe;
1771 1772 1773

	struct page_frag task_frag;

1774 1775
#ifdef	CONFIG_TASK_DELAY_ACCT
	struct task_delay_info *delays;
1776 1777 1778
#endif
#ifdef CONFIG_FAULT_INJECTION
	int make_it_fail;
1779
#endif
1780 1781 1782 1783 1784 1785
	/*
	 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
	 * balance_dirty_pages() for some dirty throttling pause
	 */
	int nr_dirtied;
	int nr_dirtied_pause;
1786
	unsigned long dirty_paused_when; /* start of a write-and-pause period */
1787

A
Arjan van de Ven 已提交
1788 1789 1790 1791
#ifdef CONFIG_LATENCYTOP
	int latency_record_count;
	struct latency_record latency_record[LT_SAVECOUNT];
#endif
1792 1793 1794 1795
	/*
	 * time slack values; these are used to round up poll() and
	 * select() etc timeout values. These are in nanoseconds.
	 */
1796 1797
	u64 timer_slack_ns;
	u64 default_timer_slack_ns;
1798

1799 1800 1801
#ifdef CONFIG_KASAN
	unsigned int kasan_depth;
#endif
1802
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
D
Daniel Mack 已提交
1803
	/* Index of current stored address in ret_stack */
1804 1805 1806
	int curr_ret_stack;
	/* Stack of return addresses for return function tracing */
	struct ftrace_ret_stack	*ret_stack;
1807 1808
	/* time stamp for last schedule */
	unsigned long long ftrace_timestamp;
1809 1810 1811 1812 1813
	/*
	 * Number of functions that haven't been traced
	 * because of depth overrun.
	 */
	atomic_t trace_overrun;
1814 1815
	/* Pause for the tracing */
	atomic_t tracing_graph_pause;
1816
#endif
1817 1818 1819
#ifdef CONFIG_TRACING
	/* state flags for use by tracers */
	unsigned long trace;
1820
	/* bitmask and counter of trace recursion */
1821 1822
	unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
D
Dmitry Vyukov 已提交
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
#ifdef CONFIG_KCOV
	/* Coverage collection mode enabled for this task (0 if disabled). */
	enum kcov_mode kcov_mode;
	/* Size of the kcov_area. */
	unsigned	kcov_size;
	/* Buffer for coverage collection. */
	void		*kcov_area;
	/* kcov desciptor wired with this task or NULL. */
	struct kcov	*kcov;
#endif
1833
#ifdef CONFIG_MEMCG
T
Tejun Heo 已提交
1834 1835 1836
	struct mem_cgroup *memcg_in_oom;
	gfp_t memcg_oom_gfp_mask;
	int memcg_oom_order;
1837 1838 1839

	/* number of pages to reclaim on returning to userland */
	unsigned int memcg_nr_pages_over_high;
1840
#endif
1841 1842 1843
#ifdef CONFIG_UPROBES
	struct uprobe_task *utask;
#endif
K
Kent Overstreet 已提交
1844 1845 1846 1847
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
	unsigned int	sequential_io;
	unsigned int	sequential_io_avg;
#endif
P
Peter Zijlstra 已提交
1848 1849 1850
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
	unsigned long	task_state_change;
#endif
1851
	int pagefault_disabled;
1852
#ifdef CONFIG_MMU
1853
	struct task_struct *oom_reaper_list;
1854
#endif
1855 1856 1857 1858 1859 1860 1861 1862
/* CPU-specific state of this task */
	struct thread_struct thread;
/*
 * WARNING: on x86, 'thread_struct' contains a variable-sized
 * structure.  It *MUST* be at the end of 'task_struct'.
 *
 * Do not put anything below here!
 */
L
Linus Torvalds 已提交
1863 1864
};

1865 1866 1867 1868 1869
#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
extern int arch_task_struct_size __read_mostly;
#else
# define arch_task_struct_size (sizeof(struct task_struct))
#endif
1870

1871
/* Future-safe accessor for struct task_struct's cpus_allowed. */
1872
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1873

1874 1875
#define TNF_MIGRATED	0x01
#define TNF_NO_GROUP	0x02
1876
#define TNF_SHARED	0x04
1877
#define TNF_FAULT_LOCAL	0x08
1878
#define TNF_MIGRATE_FAIL 0x10
1879

1880
#ifdef CONFIG_NUMA_BALANCING
1881
extern void task_numa_fault(int last_node, int node, int pages, int flags);
1882
extern pid_t task_numa_group_id(struct task_struct *p);
1883
extern void set_numabalancing_state(bool enabled);
1884
extern void task_numa_free(struct task_struct *p);
1885 1886
extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
					int src_nid, int dst_cpu);
1887
#else
1888
static inline void task_numa_fault(int last_node, int node, int pages,
1889
				   int flags)
1890 1891
{
}
1892 1893 1894 1895
static inline pid_t task_numa_group_id(struct task_struct *p)
{
	return 0;
}
1896 1897 1898
static inline void set_numabalancing_state(bool enabled)
{
}
1899 1900 1901
static inline void task_numa_free(struct task_struct *p)
{
}
1902 1903 1904 1905 1906
static inline bool should_numa_migrate_memory(struct task_struct *p,
				struct page *page, int src_nid, int dst_cpu)
{
	return true;
}
1907 1908
#endif

A
Alexey Dobriyan 已提交
1909
static inline struct pid *task_pid(struct task_struct *task)
1910 1911 1912 1913
{
	return task->pids[PIDTYPE_PID].pid;
}

A
Alexey Dobriyan 已提交
1914
static inline struct pid *task_tgid(struct task_struct *task)
1915 1916 1917 1918
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}

1919 1920 1921 1922 1923
/*
 * Without tasklist or rcu lock it is not safe to dereference
 * the result of task_pgrp/task_session even if task == current,
 * we can race with another thread doing sys_setsid/sys_setpgid.
 */
A
Alexey Dobriyan 已提交
1924
static inline struct pid *task_pgrp(struct task_struct *task)
1925 1926 1927 1928
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}

A
Alexey Dobriyan 已提交
1929
static inline struct pid *task_session(struct task_struct *task)
1930 1931 1932 1933
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}

1934 1935 1936 1937 1938 1939 1940
struct pid_namespace;

/*
 * the helpers to get the task's different pids as they are seen
 * from various namespaces
 *
 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
E
Eric W. Biederman 已提交
1941 1942
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
1943 1944 1945 1946 1947 1948
 * task_xid_nr_ns()  : id seen from the ns specified;
 *
 * set_task_vxid()   : assigns a virtual id to a task;
 *
 * see also pid_nr() etc in include/linux/pid.h
 */
1949 1950
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
			struct pid_namespace *ns);
1951

A
Alexey Dobriyan 已提交
1952
static inline pid_t task_pid_nr(struct task_struct *tsk)
1953 1954 1955 1956
{
	return tsk->pid;
}

1957 1958 1959 1960 1961
static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
}
1962 1963 1964

static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
1965
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1966 1967 1968
}


A
Alexey Dobriyan 已提交
1969
static inline pid_t task_tgid_nr(struct task_struct *tsk)
1970 1971 1972 1973
{
	return tsk->tgid;
}

1974
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1975 1976 1977 1978 1979 1980 1981

static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_tgid(tsk));
}


1982
static inline int pid_alive(const struct task_struct *p);
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
{
	pid_t pid = 0;

	rcu_read_lock();
	if (pid_alive(tsk))
		pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
	rcu_read_unlock();

	return pid;
}

static inline pid_t task_ppid_nr(const struct task_struct *tsk)
{
	return task_ppid_nr_ns(tsk, &init_pid_ns);
}

2000 2001
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
2002
{
2003
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
2004 2005 2006 2007
}

static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
2008
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
2009 2010 2011
}


2012 2013
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
2014
{
2015
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
2016 2017 2018 2019
}

static inline pid_t task_session_vnr(struct task_struct *tsk)
{
2020
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
2021 2022
}

2023 2024 2025 2026 2027
/* obsolete, do not use */
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
	return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
2028

L
Linus Torvalds 已提交
2029 2030 2031 2032 2033 2034 2035
/**
 * pid_alive - check that a task structure is not stale
 * @p: Task structure to be checked.
 *
 * Test if a process is not yet dead (at most zombie state)
 * If pid_alive fails, then pointers within the task structure
 * can be stale and must not be dereferenced.
2036 2037
 *
 * Return: 1 if the process is alive. 0 otherwise.
L
Linus Torvalds 已提交
2038
 */
2039
static inline int pid_alive(const struct task_struct *p)
L
Linus Torvalds 已提交
2040
{
2041
	return p->pids[PIDTYPE_PID].pid != NULL;
L
Linus Torvalds 已提交
2042 2043
}

2044
/**
2045 2046
 * is_global_init - check if a task structure is init. Since init
 * is free to have sub-threads we need to check tgid.
2047 2048 2049
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
2050 2051
 *
 * Return: 1 if the task structure is init. 0 otherwise.
2052
 */
A
Alexey Dobriyan 已提交
2053
static inline int is_global_init(struct task_struct *tsk)
2054
{
2055
	return task_tgid_nr(tsk) == 1;
2056
}
2057

2058 2059
extern struct pid *cad_pid;

L
Linus Torvalds 已提交
2060 2061
extern void free_task(struct task_struct *tsk);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
I
Ingo Molnar 已提交
2062

2063
extern void __put_task_struct(struct task_struct *t);
I
Ingo Molnar 已提交
2064 2065 2066 2067

static inline void put_task_struct(struct task_struct *t)
{
	if (atomic_dec_and_test(&t->usage))
2068
		__put_task_struct(t);
I
Ingo Molnar 已提交
2069
}
L
Linus Torvalds 已提交
2070

2071 2072 2073 2074 2075 2076 2077
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
extern void task_cputime(struct task_struct *t,
			 cputime_t *utime, cputime_t *stime);
extern void task_cputime_scaled(struct task_struct *t,
				cputime_t *utimescaled, cputime_t *stimescaled);
extern cputime_t task_gtime(struct task_struct *t);
#else
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
static inline void task_cputime(struct task_struct *t,
				cputime_t *utime, cputime_t *stime)
{
	if (utime)
		*utime = t->utime;
	if (stime)
		*stime = t->stime;
}

static inline void task_cputime_scaled(struct task_struct *t,
				       cputime_t *utimescaled,
				       cputime_t *stimescaled)
{
	if (utimescaled)
		*utimescaled = t->utimescaled;
	if (stimescaled)
		*stimescaled = t->stimescaled;
}
2096 2097 2098 2099 2100 2101

static inline cputime_t task_gtime(struct task_struct *t)
{
	return t->gtime;
}
#endif
2102 2103
extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
2104

L
Linus Torvalds 已提交
2105 2106 2107 2108
/*
 * Per process flags
 */
#define PF_EXITING	0x00000004	/* getting shut down */
2109
#define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
2110
#define PF_VCPU		0x00000010	/* I'm a virtual CPU */
T
Tejun Heo 已提交
2111
#define PF_WQ_WORKER	0x00000020	/* I'm a workqueue worker */
L
Linus Torvalds 已提交
2112
#define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
2113
#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
L
Linus Torvalds 已提交
2114 2115 2116 2117
#define PF_SUPERPRIV	0x00000100	/* used super-user privileges */
#define PF_DUMPCORE	0x00000200	/* dumped core */
#define PF_SIGNALED	0x00000400	/* killed by a signal */
#define PF_MEMALLOC	0x00000800	/* Allocating memory */
2118
#define PF_NPROC_EXCEEDED 0x00001000	/* set_user noticed that RLIMIT_NPROC was exceeded */
L
Linus Torvalds 已提交
2119
#define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
2120
#define PF_USED_ASYNC	0x00004000	/* used async_schedule*(), used by module init */
L
Linus Torvalds 已提交
2121 2122 2123 2124
#define PF_NOFREEZE	0x00008000	/* this thread should not be frozen */
#define PF_FROZEN	0x00010000	/* frozen for system suspend */
#define PF_FSTRANS	0x00020000	/* inside a filesystem transaction */
#define PF_KSWAPD	0x00040000	/* I am kswapd */
2125
#define PF_MEMALLOC_NOIO 0x00080000	/* Allocating memory without IO involved */
L
Linus Torvalds 已提交
2126
#define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
2127
#define PF_KTHREAD	0x00200000	/* I am a kernel thread */
J
Jens Axboe 已提交
2128 2129
#define PF_RANDOMIZE	0x00400000	/* randomize virtual address space */
#define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
2130
#define PF_NO_SETAFFINITY 0x04000000	/* Userland is not allowed to meddle with cpus_allowed */
2131
#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
2132
#define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
2133
#define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezable */
2134
#define PF_SUSPEND_TASK 0x80000000      /* this thread called freeze_processes and should not be frozen */
L
Linus Torvalds 已提交
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160

/*
 * Only the _current_ task can read/write to tsk->flags, but other
 * tasks can access tsk->flags in readonly mode for example
 * with tsk_used_math (like during threaded core dumping).
 * There is however an exception to this rule during ptrace
 * or during fork: the ptracer task is allowed to write to the
 * child->flags of its traced child (same goes for fork, the parent
 * can write to the child->flags), because we're guaranteed the
 * child is not running and in turn not changing child->flags
 * at the same time the parent does it.
 */
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
#define clear_used_math() clear_stopped_child_used_math(current)
#define set_used_math() set_stopped_child_used_math(current)
#define conditional_stopped_child_used_math(condition, child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
#define conditional_used_math(condition) \
	conditional_stopped_child_used_math(condition, current)
#define copy_to_stopped_child_used_math(child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
#define used_math() tsk_used_math(current)

2161 2162 2163
/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
 * __GFP_FS is also cleared as it implies __GFP_IO.
 */
2164 2165 2166
static inline gfp_t memalloc_noio_flags(gfp_t flags)
{
	if (unlikely(current->flags & PF_MEMALLOC_NOIO))
2167
		flags &= ~(__GFP_IO | __GFP_FS);
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
	return flags;
}

static inline unsigned int memalloc_noio_save(void)
{
	unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
	current->flags |= PF_MEMALLOC_NOIO;
	return flags;
}

static inline void memalloc_noio_restore(unsigned int flags)
{
	current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
}

2183
/* Per-process atomic flags. */
2184
#define PFA_NO_NEW_PRIVS 0	/* May not gain new privileges. */
2185 2186 2187
#define PFA_SPREAD_PAGE  1      /* Spread page cache over cpuset */
#define PFA_SPREAD_SLAB  2      /* Spread some slab caches over cpuset */

2188

2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200
#define TASK_PFA_TEST(name, func)					\
	static inline bool task_##func(struct task_struct *p)		\
	{ return test_bit(PFA_##name, &p->atomic_flags); }
#define TASK_PFA_SET(name, func)					\
	static inline void task_set_##func(struct task_struct *p)	\
	{ set_bit(PFA_##name, &p->atomic_flags); }
#define TASK_PFA_CLEAR(name, func)					\
	static inline void task_clear_##func(struct task_struct *p)	\
	{ clear_bit(PFA_##name, &p->atomic_flags); }

TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
2201

2202 2203 2204 2205 2206 2207 2208
TASK_PFA_TEST(SPREAD_PAGE, spread_page)
TASK_PFA_SET(SPREAD_PAGE, spread_page)
TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)

TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
TASK_PFA_SET(SPREAD_SLAB, spread_slab)
TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
2209

2210
/*
2211
 * task->jobctl flags
2212
 */
2213
#define JOBCTL_STOP_SIGMASK	0xffff	/* signr of the last group stop */
2214

2215 2216 2217
#define JOBCTL_STOP_DEQUEUED_BIT 16	/* stop signal dequeued */
#define JOBCTL_STOP_PENDING_BIT	17	/* task should stop for group stop */
#define JOBCTL_STOP_CONSUME_BIT	18	/* consume group stop count */
2218
#define JOBCTL_TRAP_STOP_BIT	19	/* trap for STOP */
2219
#define JOBCTL_TRAP_NOTIFY_BIT	20	/* trap for NOTIFY */
2220
#define JOBCTL_TRAPPING_BIT	21	/* switching to TRACED */
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#define JOBCTL_LISTENING_BIT	22	/* ptracer is listening for events */
2222

2223 2224 2225 2226 2227 2228 2229
#define JOBCTL_STOP_DEQUEUED	(1UL << JOBCTL_STOP_DEQUEUED_BIT)
#define JOBCTL_STOP_PENDING	(1UL << JOBCTL_STOP_PENDING_BIT)
#define JOBCTL_STOP_CONSUME	(1UL << JOBCTL_STOP_CONSUME_BIT)
#define JOBCTL_TRAP_STOP	(1UL << JOBCTL_TRAP_STOP_BIT)
#define JOBCTL_TRAP_NOTIFY	(1UL << JOBCTL_TRAP_NOTIFY_BIT)
#define JOBCTL_TRAPPING		(1UL << JOBCTL_TRAPPING_BIT)
#define JOBCTL_LISTENING	(1UL << JOBCTL_LISTENING_BIT)
2230

2231
#define JOBCTL_TRAP_MASK	(JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2232
#define JOBCTL_PENDING_MASK	(JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2233

2234
extern bool task_set_jobctl_pending(struct task_struct *task,
2235
				    unsigned long mask);
2236
extern void task_clear_jobctl_trapping(struct task_struct *task);
2237
extern void task_clear_jobctl_pending(struct task_struct *task,
2238
				      unsigned long mask);
2239

2240 2241
static inline void rcu_copy_process(struct task_struct *p)
{
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2242
#ifdef CONFIG_PREEMPT_RCU
2243
	p->rcu_read_lock_nesting = 0;
2244
	p->rcu_read_unlock_special.s = 0;
2245
	p->rcu_blocked_node = NULL;
2246
	INIT_LIST_HEAD(&p->rcu_node_entry);
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2247 2248 2249 2250
#endif /* #ifdef CONFIG_PREEMPT_RCU */
#ifdef CONFIG_TASKS_RCU
	p->rcu_tasks_holdout = false;
	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
2251
	p->rcu_tasks_idle_cpu = -1;
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2252
#endif /* #ifdef CONFIG_TASKS_RCU */
2253 2254
}

2255 2256 2257 2258 2259 2260 2261
static inline void tsk_restore_flags(struct task_struct *task,
				unsigned long orig_flags, unsigned long flags)
{
	task->flags &= ~flags;
	task->flags |= orig_flags & flags;
}

2262 2263
extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
				     const struct cpumask *trial);
2264 2265
extern int task_can_attach(struct task_struct *p,
			   const struct cpumask *cs_cpus_allowed);
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#ifdef CONFIG_SMP
2267 2268 2269
extern void do_set_cpus_allowed(struct task_struct *p,
			       const struct cpumask *new_mask);

2270
extern int set_cpus_allowed_ptr(struct task_struct *p,
2271
				const struct cpumask *new_mask);
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#else
2273 2274 2275 2276
static inline void do_set_cpus_allowed(struct task_struct *p,
				      const struct cpumask *new_mask)
{
}
2277
static inline int set_cpus_allowed_ptr(struct task_struct *p,
2278
				       const struct cpumask *new_mask)
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{
2280
	if (!cpumask_test_cpu(0, new_mask))
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		return -EINVAL;
	return 0;
}
#endif
2285

2286
#ifdef CONFIG_NO_HZ_COMMON
2287 2288 2289 2290 2291
void calc_load_enter_idle(void);
void calc_load_exit_idle(void);
#else
static inline void calc_load_enter_idle(void) { }
static inline void calc_load_exit_idle(void) { }
2292
#endif /* CONFIG_NO_HZ_COMMON */
2293

2294
/*
2295 2296 2297 2298 2299 2300
 * Do not use outside of architecture code which knows its limitations.
 *
 * sched_clock() has no promise of monotonicity or bounded drift between
 * CPUs, use (which you should not) requires disabling IRQs.
 *
 * Please use one of the three interfaces below.
2301
 */
2302
extern unsigned long long notrace sched_clock(void);
2303
/*
2304
 * See the comment in kernel/sched/clock.c
2305 2306 2307
 */
extern u64 cpu_clock(int cpu);
extern u64 local_clock(void);
2308
extern u64 running_clock(void);
2309 2310
extern u64 sched_clock_cpu(int cpu);

2311

2312
extern void sched_clock_init(void);
2313

2314
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
static inline void sched_clock_tick(void)
{
}

static inline void sched_clock_idle_sleep_event(void)
{
}

static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
{
}
#else
2327 2328 2329 2330 2331 2332
/*
 * Architectures can set this to 1 if they have specified
 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
 * but then during bootup it turns out that sched_clock()
 * is reliable after all:
 */
2333 2334 2335
extern int sched_clock_stable(void);
extern void set_sched_clock_stable(void);
extern void clear_sched_clock_stable(void);
2336

2337 2338 2339 2340 2341
extern void sched_clock_tick(void);
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
#endif

2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
/*
 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
 * The reason for this explicit opt-in is not to have perf penalty with
 * slow sched_clocks.
 */
extern void enable_sched_clock_irqtime(void);
extern void disable_sched_clock_irqtime(void);
#else
static inline void enable_sched_clock_irqtime(void) {}
static inline void disable_sched_clock_irqtime(void) {}
#endif

2355
extern unsigned long long
2356
task_sched_runtime(struct task_struct *task);
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/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP
extern void sched_exec(void);
#else
#define sched_exec()   {}
#endif

2365 2366
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2367

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#ifdef CONFIG_HOTPLUG_CPU
extern void idle_task_exit(void);
#else
static inline void idle_task_exit(void) {}
#endif

2374
#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2375
extern void wake_up_nohz_cpu(int cpu);
2376
#else
2377
static inline void wake_up_nohz_cpu(int cpu) { }
2378 2379
#endif

2380
#ifdef CONFIG_NO_HZ_FULL
2381
extern u64 scheduler_tick_max_deferment(void);
2382 2383
#endif

2384 2385 2386 2387 2388 2389 2390
#ifdef CONFIG_SCHED_AUTOGROUP
extern void sched_autogroup_create_attach(struct task_struct *p);
extern void sched_autogroup_detach(struct task_struct *p);
extern void sched_autogroup_fork(struct signal_struct *sig);
extern void sched_autogroup_exit(struct signal_struct *sig);
#ifdef CONFIG_PROC_FS
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2391
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2392 2393 2394 2395 2396 2397 2398 2399
#endif
#else
static inline void sched_autogroup_create_attach(struct task_struct *p) { }
static inline void sched_autogroup_detach(struct task_struct *p) { }
static inline void sched_autogroup_fork(struct signal_struct *sig) { }
static inline void sched_autogroup_exit(struct signal_struct *sig) { }
#endif

2400
extern int yield_to(struct task_struct *p, bool preempt);
2401 2402
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
/**
 * task_nice - return the nice value of a given task.
 * @p: the task in question.
 *
 * Return: The nice value [ -20 ... 0 ... 19 ].
 */
static inline int task_nice(const struct task_struct *p)
{
	return PRIO_TO_NICE((p)->static_prio);
}
2413 2414
extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
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extern int idle_cpu(int cpu);
2416 2417
extern int sched_setscheduler(struct task_struct *, int,
			      const struct sched_param *);
2418
extern int sched_setscheduler_nocheck(struct task_struct *, int,
2419
				      const struct sched_param *);
2420 2421
extern int sched_setattr(struct task_struct *,
			 const struct sched_attr *);
2422
extern struct task_struct *idle_task(int cpu);
2423 2424
/**
 * is_idle_task - is the specified task an idle task?
2425
 * @p: the task in question.
2426 2427
 *
 * Return: 1 if @p is an idle task. 0 otherwise.
2428
 */
2429
static inline bool is_idle_task(const struct task_struct *p)
2430 2431 2432
{
	return p->pid == 0;
}
2433 2434
extern struct task_struct *curr_task(int cpu);
extern void set_curr_task(int cpu, struct task_struct *p);
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void yield(void);

union thread_union {
	struct thread_info thread_info;
	unsigned long stack[THREAD_SIZE/sizeof(long)];
};

#ifndef __HAVE_ARCH_KSTACK_END
static inline int kstack_end(void *addr)
{
	/* Reliable end of stack detection:
	 * Some APM bios versions misalign the stack
	 */
	return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
}
#endif

extern union thread_union init_thread_union;
extern struct task_struct init_task;

extern struct   mm_struct init_mm;

2458 2459 2460 2461 2462 2463 2464
extern struct pid_namespace init_pid_ns;

/*
 * find a task by one of its numerical ids
 *
 * find_task_by_pid_ns():
 *      finds a task by its pid in the specified namespace
2465 2466
 * find_task_by_vpid():
 *      finds a task by its virtual pid
2467
 *
2468
 * see also find_vpid() etc in include/linux/pid.h
2469 2470
 */

2471 2472 2473
extern struct task_struct *find_task_by_vpid(pid_t nr);
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
		struct pid_namespace *ns);
2474

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2475
/* per-UID process charging. */
2476
extern struct user_struct * alloc_uid(kuid_t);
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2477 2478 2479 2480 2481 2482 2483 2484 2485
static inline struct user_struct *get_uid(struct user_struct *u)
{
	atomic_inc(&u->__count);
	return u;
}
extern void free_uid(struct user_struct *);

#include <asm/current.h>

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Torben Hohn 已提交
2486
extern void xtime_update(unsigned long ticks);
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2487

2488 2489
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
2490
extern void wake_up_new_task(struct task_struct *tsk);
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2491 2492 2493 2494 2495
#ifdef CONFIG_SMP
 extern void kick_process(struct task_struct *tsk);
#else
 static inline void kick_process(struct task_struct *tsk) { }
#endif
2496
extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
2497
extern void sched_dead(struct task_struct *p);
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extern void proc_caches_init(void);
extern void flush_signals(struct task_struct *);
2501
extern void ignore_signals(struct task_struct *);
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2502 2503 2504
extern void flush_signal_handlers(struct task_struct *, int force_default);
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);

2505
static inline int kernel_dequeue_signal(siginfo_t *info)
L
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2506
{
2507 2508
	struct task_struct *tsk = current;
	siginfo_t __info;
L
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2509 2510
	int ret;

2511 2512 2513
	spin_lock_irq(&tsk->sighand->siglock);
	ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);
	spin_unlock_irq(&tsk->sighand->siglock);
L
Linus Torvalds 已提交
2514 2515

	return ret;
2516
}
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2517

2518 2519 2520 2521 2522 2523 2524 2525 2526 2527
static inline void kernel_signal_stop(void)
{
	spin_lock_irq(&current->sighand->siglock);
	if (current->jobctl & JOBCTL_STOP_DEQUEUED)
		__set_current_state(TASK_STOPPED);
	spin_unlock_irq(&current->sighand->siglock);

	schedule();
}

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extern void release_task(struct task_struct * p);
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
extern int force_sigsegv(int, struct task_struct *);
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2532 2533
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2534 2535
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
				const struct cred *, u32);
2536 2537
extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
2538
extern int kill_proc_info(int, struct siginfo *, pid_t);
2539
extern __must_check bool do_notify_parent(struct task_struct *, int);
2540
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
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2541 2542
extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
2543
extern int zap_other_threads(struct task_struct *p);
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2544 2545
extern struct sigqueue *sigqueue_alloc(void);
extern void sigqueue_free(struct sigqueue *);
2546
extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2547
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
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2549 2550 2551
static inline void restore_saved_sigmask(void)
{
	if (test_and_clear_restore_sigmask())
2552
		__set_current_blocked(&current->saved_sigmask);
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2553 2554
}

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2555 2556 2557 2558 2559 2560 2561 2562
static inline sigset_t *sigmask_to_save(void)
{
	sigset_t *res = &current->blocked;
	if (unlikely(test_restore_sigmask()))
		res = &current->saved_sigmask;
	return res;
}

2563 2564 2565 2566 2567
static inline int kill_cad_pid(int sig, int priv)
{
	return kill_pid(cad_pid, sig, priv);
}

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/* These can be the second arg to send_sig_info/send_group_sig_info.  */
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
#define SEND_SIG_PRIV	((struct siginfo *) 1)
#define SEND_SIG_FORCED	((struct siginfo *) 2)

2573 2574 2575
/*
 * True if we are on the alternate signal stack.
 */
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2576 2577
static inline int on_sig_stack(unsigned long sp)
{
2578 2579 2580 2581 2582 2583 2584
#ifdef CONFIG_STACK_GROWSUP
	return sp >= current->sas_ss_sp &&
		sp - current->sas_ss_sp < current->sas_ss_size;
#else
	return sp > current->sas_ss_sp &&
		sp - current->sas_ss_sp <= current->sas_ss_size;
#endif
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2585 2586 2587 2588
}

static inline int sas_ss_flags(unsigned long sp)
{
2589 2590 2591 2592
	if (!current->sas_ss_size)
		return SS_DISABLE;

	return on_sig_stack(sp) ? SS_ONSTACK : 0;
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}

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2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
{
	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
#ifdef CONFIG_STACK_GROWSUP
		return current->sas_ss_sp;
#else
		return current->sas_ss_sp + current->sas_ss_size;
#endif
	return sp;
}

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/*
 * Routines for handling mm_structs
 */
extern struct mm_struct * mm_alloc(void);

/* mmdrop drops the mm and the page tables */
2612
extern void __mmdrop(struct mm_struct *);
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2613 2614
static inline void mmdrop(struct mm_struct * mm)
{
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Ingo Molnar 已提交
2615
	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
L
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2616 2617 2618 2619 2620 2621 2622
		__mmdrop(mm);
}

/* mmput gets rid of the mappings and all user-space */
extern void mmput(struct mm_struct *);
/* Grab a reference to a task's mm, if it is not already going away */
extern struct mm_struct *get_task_mm(struct task_struct *task);
2623 2624 2625 2626 2627 2628
/*
 * Grab a reference to a task's mm, if it is not already going away
 * and ptrace_may_access with the mode parameter passed to it
 * succeeds.
 */
extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
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2629 2630 2631
/* Remove the current tasks stale references to the old mm_struct */
extern void mm_release(struct task_struct *, struct mm_struct *);

2632 2633 2634 2635
#ifdef CONFIG_HAVE_COPY_THREAD_TLS
extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
			struct task_struct *, unsigned long);
#else
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Alexey Dobriyan 已提交
2636
extern int copy_thread(unsigned long, unsigned long, unsigned long,
2637
			struct task_struct *);
2638 2639 2640 2641 2642 2643 2644 2645 2646 2647

/* Architectures that haven't opted into copy_thread_tls get the tls argument
 * via pt_regs, so ignore the tls argument passed via C. */
static inline int copy_thread_tls(
		unsigned long clone_flags, unsigned long sp, unsigned long arg,
		struct task_struct *p, unsigned long tls)
{
	return copy_thread(clone_flags, sp, arg, p);
}
#endif
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extern void flush_thread(void);
extern void exit_thread(void);

extern void exit_files(struct task_struct *);
2652
extern void __cleanup_sighand(struct sighand_struct *);
2653

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2654
extern void exit_itimers(struct signal_struct *);
2655
extern void flush_itimer_signals(void);
L
Linus Torvalds 已提交
2656

2657
extern void do_group_exit(int);
L
Linus Torvalds 已提交
2658

2659
extern int do_execve(struct filename *,
2660
		     const char __user * const __user *,
2661
		     const char __user * const __user *);
2662 2663 2664 2665
extern int do_execveat(int, struct filename *,
		       const char __user * const __user *,
		       const char __user * const __user *,
		       int);
2666
extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
2667
extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2668
struct task_struct *fork_idle(int);
2669
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
L
Linus Torvalds 已提交
2670

2671 2672 2673 2674 2675
extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
static inline void set_task_comm(struct task_struct *tsk, const char *from)
{
	__set_task_comm(tsk, from, false);
}
2676
extern char *get_task_comm(char *to, struct task_struct *tsk);
L
Linus Torvalds 已提交
2677 2678

#ifdef CONFIG_SMP
2679
void scheduler_ipi(void);
R
Roland McGrath 已提交
2680
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
L
Linus Torvalds 已提交
2681
#else
2682
static inline void scheduler_ipi(void) { }
R
Roland McGrath 已提交
2683 2684 2685 2686 2687
static inline unsigned long wait_task_inactive(struct task_struct *p,
					       long match_state)
{
	return 1;
}
L
Linus Torvalds 已提交
2688 2689
#endif

2690 2691 2692
#define tasklist_empty() \
	list_empty(&init_task.tasks)

2693 2694
#define next_task(p) \
	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
L
Linus Torvalds 已提交
2695 2696 2697 2698

#define for_each_process(p) \
	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

2699
extern bool current_is_single_threaded(void);
D
David Howells 已提交
2700

L
Linus Torvalds 已提交
2701 2702 2703 2704 2705 2706 2707 2708 2709 2710
/*
 * Careful: do_each_thread/while_each_thread is a double loop so
 *          'break' will not work as expected - use goto instead.
 */
#define do_each_thread(g, t) \
	for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do

#define while_each_thread(g, t) \
	while ((t = next_thread(t)) != g)

2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
#define __for_each_thread(signal, t)	\
	list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)

#define for_each_thread(p, t)		\
	__for_each_thread((p)->signal, t)

/* Careful: this is a double loop, 'break' won't work as expected. */
#define for_each_process_thread(p, t)	\
	for_each_process(p) for_each_thread(p, t)

2721 2722
static inline int get_nr_threads(struct task_struct *tsk)
{
2723
	return tsk->signal->nr_threads;
2724 2725
}

2726 2727 2728 2729
static inline bool thread_group_leader(struct task_struct *p)
{
	return p->exit_signal >= 0;
}
L
Linus Torvalds 已提交
2730

2731 2732 2733 2734 2735 2736
/* Do to the insanities of de_thread it is possible for a process
 * to have the pid of the thread group leader without actually being
 * the thread group leader.  For iteration through the pids in proc
 * all we care about is that we have a task with the appropriate
 * pid, we don't actually care if we have the right task.
 */
2737
static inline bool has_group_leader_pid(struct task_struct *p)
2738
{
2739
	return task_pid(p) == p->signal->leader_pid;
2740 2741
}

2742
static inline
2743
bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
2744
{
2745
	return p1->signal == p2->signal;
2746 2747
}

2748
static inline struct task_struct *next_thread(const struct task_struct *p)
O
Oleg Nesterov 已提交
2749
{
2750 2751
	return list_entry_rcu(p->thread_group.next,
			      struct task_struct, thread_group);
O
Oleg Nesterov 已提交
2752 2753
}

A
Alexey Dobriyan 已提交
2754
static inline int thread_group_empty(struct task_struct *p)
L
Linus Torvalds 已提交
2755
{
O
Oleg Nesterov 已提交
2756
	return list_empty(&p->thread_group);
L
Linus Torvalds 已提交
2757 2758 2759 2760 2761 2762
}

#define delay_group_leader(p) \
		(thread_group_leader(p) && !thread_group_empty(p))

/*
2763
 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2764
 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2765
 * pins the final release of task.io_context.  Also protects ->cpuset and
O
Oleg Nesterov 已提交
2766
 * ->cgroup.subsys[]. And ->vfork_done.
L
Linus Torvalds 已提交
2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781
 *
 * Nests both inside and outside of read_lock(&tasklist_lock).
 * It must not be nested with write_lock_irq(&tasklist_lock),
 * neither inside nor outside.
 */
static inline void task_lock(struct task_struct *p)
{
	spin_lock(&p->alloc_lock);
}

static inline void task_unlock(struct task_struct *p)
{
	spin_unlock(&p->alloc_lock);
}

2782
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2783 2784
							unsigned long *flags);

2785 2786 2787 2788 2789 2790 2791 2792 2793
static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
						       unsigned long *flags)
{
	struct sighand_struct *ret;

	ret = __lock_task_sighand(tsk, flags);
	(void)__cond_lock(&tsk->sighand->siglock, ret);
	return ret;
}
2794

2795 2796 2797 2798 2799 2800
static inline void unlock_task_sighand(struct task_struct *tsk,
						unsigned long *flags)
{
	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
}

2801
/**
2802 2803
 * threadgroup_change_begin - mark the beginning of changes to a threadgroup
 * @tsk: task causing the changes
2804
 *
2805 2806 2807 2808 2809 2810
 * All operations which modify a threadgroup - a new thread joining the
 * group, death of a member thread (the assertion of PF_EXITING) and
 * exec(2) dethreading the process and replacing the leader - are wrapped
 * by threadgroup_change_{begin|end}().  This is to provide a place which
 * subsystems needing threadgroup stability can hook into for
 * synchronization.
2811
 */
2812
static inline void threadgroup_change_begin(struct task_struct *tsk)
2813
{
2814 2815
	might_sleep();
	cgroup_threadgroup_change_begin(tsk);
2816
}
2817 2818

/**
2819 2820
 * threadgroup_change_end - mark the end of changes to a threadgroup
 * @tsk: task causing the changes
2821
 *
2822
 * See threadgroup_change_begin().
2823
 */
2824
static inline void threadgroup_change_end(struct task_struct *tsk)
2825
{
2826
	cgroup_threadgroup_change_end(tsk);
2827 2828
}

A
Al Viro 已提交
2829 2830
#ifndef __HAVE_THREAD_FUNCTIONS

R
Roman Zippel 已提交
2831 2832
#define task_thread_info(task)	((struct thread_info *)(task)->stack)
#define task_stack_page(task)	((task)->stack)
A
Al Viro 已提交
2833

2834 2835 2836 2837 2838 2839
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
{
	*task_thread_info(p) = *task_thread_info(org);
	task_thread_info(p)->task = p;
}

2840 2841 2842 2843 2844 2845 2846 2847 2848
/*
 * Return the address of the last usable long on the stack.
 *
 * When the stack grows down, this is just above the thread
 * info struct. Going any lower will corrupt the threadinfo.
 *
 * When the stack grows up, this is the highest address.
 * Beyond that position, we corrupt data on the next page.
 */
2849 2850
static inline unsigned long *end_of_stack(struct task_struct *p)
{
2851 2852 2853
#ifdef CONFIG_STACK_GROWSUP
	return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
#else
R
Roman Zippel 已提交
2854
	return (unsigned long *)(task_thread_info(p) + 1);
2855
#endif
2856 2857
}

A
Al Viro 已提交
2858
#endif
2859 2860
#define task_stack_end_corrupted(task) \
		(*(end_of_stack(task)) != STACK_END_MAGIC)
A
Al Viro 已提交
2861

2862 2863 2864 2865 2866 2867 2868
static inline int object_is_on_stack(void *obj)
{
	void *stack = task_stack_page(current);

	return (obj >= stack) && (obj < (stack + THREAD_SIZE));
}

2869 2870
extern void thread_info_cache_init(void);

2871 2872 2873 2874 2875 2876
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long stack_not_used(struct task_struct *p)
{
	unsigned long *n = end_of_stack(p);

	do { 	/* Skip over canary */
2877 2878 2879
# ifdef CONFIG_STACK_GROWSUP
		n--;
# else
2880
		n++;
2881
# endif
2882 2883
	} while (!*n);

2884 2885 2886
# ifdef CONFIG_STACK_GROWSUP
	return (unsigned long)end_of_stack(p) - (unsigned long)n;
# else
2887
	return (unsigned long)n - (unsigned long)end_of_stack(p);
2888
# endif
2889 2890
}
#endif
2891
extern void set_task_stack_end_magic(struct task_struct *tsk);
2892

L
Linus Torvalds 已提交
2893 2894 2895 2896 2897
/* set thread flags in other task's structures
 * - see asm/thread_info.h for TIF_xxxx flags available
 */
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2898
	set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2899 2900 2901 2902
}

static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2903
	clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2904 2905 2906 2907
}

static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2908
	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2909 2910 2911 2912
}

static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2913
	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2914 2915 2916 2917
}

static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
2918
	return test_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930
}

static inline void set_tsk_need_resched(struct task_struct *tsk)
{
	set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

static inline void clear_tsk_need_resched(struct task_struct *tsk)
{
	clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

2931 2932 2933 2934 2935
static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}

2936 2937 2938 2939 2940 2941
static inline int restart_syscall(void)
{
	set_tsk_thread_flag(current, TIF_SIGPENDING);
	return -ERESTARTNOINTR;
}

L
Linus Torvalds 已提交
2942 2943 2944 2945
static inline int signal_pending(struct task_struct *p)
{
	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
}
M
Matthew Wilcox 已提交
2946

2947 2948 2949 2950
static inline int __fatal_signal_pending(struct task_struct *p)
{
	return unlikely(sigismember(&p->pending.signal, SIGKILL));
}
M
Matthew Wilcox 已提交
2951 2952 2953 2954 2955 2956

static inline int fatal_signal_pending(struct task_struct *p)
{
	return signal_pending(p) && __fatal_signal_pending(p);
}

2957 2958 2959 2960 2961 2962 2963 2964 2965 2966
static inline int signal_pending_state(long state, struct task_struct *p)
{
	if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
		return 0;
	if (!signal_pending(p))
		return 0;

	return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
}

L
Linus Torvalds 已提交
2967 2968 2969 2970 2971 2972 2973
/*
 * cond_resched() and cond_resched_lock(): latency reduction via
 * explicit rescheduling in places that are safe. The return
 * value indicates whether a reschedule was done in fact.
 * cond_resched_lock() will drop the spinlock before scheduling,
 * cond_resched_softirq() will enable bhs before scheduling.
 */
2974
extern int _cond_resched(void);
2975

2976
#define cond_resched() ({			\
2977
	___might_sleep(__FILE__, __LINE__, 0);	\
2978 2979
	_cond_resched();			\
})
2980

2981 2982 2983
extern int __cond_resched_lock(spinlock_t *lock);

#define cond_resched_lock(lock) ({				\
2984
	___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
2985 2986 2987 2988 2989
	__cond_resched_lock(lock);				\
})

extern int __cond_resched_softirq(void);

2990
#define cond_resched_softirq() ({					\
2991
	___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);	\
2992
	__cond_resched_softirq();					\
2993
})
L
Linus Torvalds 已提交
2994

2995 2996 2997 2998 2999 3000 3001 3002 3003
static inline void cond_resched_rcu(void)
{
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
	rcu_read_unlock();
	cond_resched();
	rcu_read_lock();
#endif
}

L
Linus Torvalds 已提交
3004 3005
/*
 * Does a critical section need to be broken due to another
N
Nick Piggin 已提交
3006 3007
 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
L
Linus Torvalds 已提交
3008
 */
N
Nick Piggin 已提交
3009
static inline int spin_needbreak(spinlock_t *lock)
L
Linus Torvalds 已提交
3010
{
N
Nick Piggin 已提交
3011 3012 3013
#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
L
Linus Torvalds 已提交
3014
	return 0;
N
Nick Piggin 已提交
3015
#endif
L
Linus Torvalds 已提交
3016 3017
}

3018 3019
/*
 * Idle thread specific functions to determine the need_resched
3020
 * polling state.
3021
 */
3022
#ifdef TIF_POLLING_NRFLAG
3023 3024 3025 3026
static inline int tsk_is_polling(struct task_struct *p)
{
	return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
}
3027 3028

static inline void __current_set_polling(void)
3029 3030 3031 3032
{
	set_thread_flag(TIF_POLLING_NRFLAG);
}

3033 3034 3035 3036 3037 3038
static inline bool __must_check current_set_polling_and_test(void)
{
	__current_set_polling();

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
3039
	 * paired by resched_curr()
3040
	 */
3041
	smp_mb__after_atomic();
3042 3043 3044 3045 3046

	return unlikely(tif_need_resched());
}

static inline void __current_clr_polling(void)
3047 3048 3049
{
	clear_thread_flag(TIF_POLLING_NRFLAG);
}
3050 3051 3052 3053 3054 3055 3056

static inline bool __must_check current_clr_polling_and_test(void)
{
	__current_clr_polling();

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
3057
	 * paired by resched_curr()
3058
	 */
3059
	smp_mb__after_atomic();
3060 3061 3062 3063

	return unlikely(tif_need_resched());
}

3064 3065
#else
static inline int tsk_is_polling(struct task_struct *p) { return 0; }
3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076
static inline void __current_set_polling(void) { }
static inline void __current_clr_polling(void) { }

static inline bool __must_check current_set_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
static inline bool __must_check current_clr_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
3077 3078
#endif

3079 3080 3081 3082 3083 3084 3085 3086 3087 3088
static inline void current_clr_polling(void)
{
	__current_clr_polling();

	/*
	 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
	 * Once the bit is cleared, we'll get IPIs with every new
	 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
	 * fold.
	 */
3089
	smp_mb(); /* paired with resched_curr() */
3090 3091 3092 3093

	preempt_fold_need_resched();
}

3094 3095 3096 3097 3098
static __always_inline bool need_resched(void)
{
	return unlikely(tif_need_resched());
}

3099 3100 3101
/*
 * Thread group CPU time accounting.
 */
3102
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
3103
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
3104

R
Roland McGrath 已提交
3105 3106 3107 3108 3109 3110 3111
/*
 * Reevaluate whether the task has signals pending delivery.
 * Wake the task if so.
 * This is required every time the blocked sigset_t changes.
 * callers must hold sighand->siglock.
 */
extern void recalc_sigpending_and_wake(struct task_struct *t);
L
Linus Torvalds 已提交
3112 3113
extern void recalc_sigpending(void);

3114 3115 3116 3117 3118 3119 3120 3121 3122 3123
extern void signal_wake_up_state(struct task_struct *t, unsigned int state);

static inline void signal_wake_up(struct task_struct *t, bool resume)
{
	signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
}
static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
{
	signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
}
L
Linus Torvalds 已提交
3124 3125 3126 3127 3128 3129 3130 3131

/*
 * Wrappers for p->thread_info->cpu access. No-op on UP.
 */
#ifdef CONFIG_SMP

static inline unsigned int task_cpu(const struct task_struct *p)
{
A
Al Viro 已提交
3132
	return task_thread_info(p)->cpu;
L
Linus Torvalds 已提交
3133 3134
}

I
Ingo Molnar 已提交
3135 3136 3137 3138 3139
static inline int task_node(const struct task_struct *p)
{
	return cpu_to_node(task_cpu(p));
}

I
Ingo Molnar 已提交
3140
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
L
Linus Torvalds 已提交
3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154

#else

static inline unsigned int task_cpu(const struct task_struct *p)
{
	return 0;
}

static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
{
}

#endif /* CONFIG_SMP */

3155 3156
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
3157

D
Dhaval Giani 已提交
3158
#ifdef CONFIG_CGROUP_SCHED
3159
extern struct task_group root_task_group;
P
Peter Zijlstra 已提交
3160
#endif /* CONFIG_CGROUP_SCHED */
3161

3162 3163 3164
extern int task_can_switch_user(struct user_struct *up,
					struct task_struct *tsk);

3165 3166 3167
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
3168
	tsk->ioac.rchar += amt;
3169 3170 3171 3172
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
3173
	tsk->ioac.wchar += amt;
3174 3175 3176 3177
}

static inline void inc_syscr(struct task_struct *tsk)
{
3178
	tsk->ioac.syscr++;
3179 3180 3181 3182
}

static inline void inc_syscw(struct task_struct *tsk)
{
3183
	tsk->ioac.syscw++;
3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202
}
#else
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void inc_syscr(struct task_struct *tsk)
{
}

static inline void inc_syscw(struct task_struct *tsk)
{
}
#endif

D
Dave Hansen 已提交
3203 3204 3205 3206
#ifndef TASK_SIZE_OF
#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

O
Oleg Nesterov 已提交
3207
#ifdef CONFIG_MEMCG
3208 3209 3210 3211 3212
extern void mm_update_next_owner(struct mm_struct *mm);
#else
static inline void mm_update_next_owner(struct mm_struct *mm)
{
}
O
Oleg Nesterov 已提交
3213
#endif /* CONFIG_MEMCG */
3214

3215 3216 3217
static inline unsigned long task_rlimit(const struct task_struct *tsk,
		unsigned int limit)
{
3218
	return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
3219 3220 3221 3222 3223
}

static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
		unsigned int limit)
{
3224
	return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236
}

static inline unsigned long rlimit(unsigned int limit)
{
	return task_rlimit(current, limit);
}

static inline unsigned long rlimit_max(unsigned int limit)
{
	return task_rlimit_max(current, limit);
}

3237 3238 3239 3240 3241 3242 3243 3244 3245
#ifdef CONFIG_CPU_FREQ
struct update_util_data {
	void (*func)(struct update_util_data *data,
		     u64 time, unsigned long util, unsigned long max);
};

void cpufreq_set_update_util_data(int cpu, struct update_util_data *data);
#endif /* CONFIG_CPU_FREQ */

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#endif