sched.h 85.2 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_mask.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>
#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/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 <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 exec_domain;
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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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#define VMACACHE_BITS 2
#define VMACACHE_SIZE (1U << VMACACHE_BITS)
#define VMACACHE_MASK (VMACACHE_SIZE - 1)

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/*
 * List of flags we want to share for kernel threads,
 * if only because they are not used by them anyway.
 */
#define CLONE_KERNEL	(CLONE_FS | CLONE_FILES | CLONE_SIGHAND)

/*
 * 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);
extern unsigned long nr_iowait(void);
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extern unsigned long nr_iowait_cpu(int cpu);
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extern unsigned long this_cpu_load(void);


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extern void calc_global_load(unsigned long ticks);
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extern void update_cpu_load_nohz(void);
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extern unsigned long get_parent_ip(unsigned long addr);

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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);
extern void
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print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
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#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
#define TASK_STATE_MAX		1024
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#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
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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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/* 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)
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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)		\
	set_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)			\
	do { current->state = (state_value); } while (0)
#define set_current_state(state_value)		\
	set_mb(current->state, (state_value))

/* 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 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(int pinned);
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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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static inline int get_nohz_timer_target(int pinned)
{
	return smp_processor_id();
}
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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);

void io_schedule(void);
long io_schedule_timeout(long timeout);

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(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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void lockup_detector_init(void);
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#else
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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asmlinkage void schedule(void);
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extern void schedule_preempt_disabled(void);
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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_FILTER_SHIFT	MMF_DUMPABLE_BITS
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#define MMF_DUMP_FILTER_BITS	7
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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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};

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struct pacct_struct {
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	int			ac_flag;
	long			ac_exitcode;
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	unsigned long		ac_mem;
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	cputime_t		ac_utime, ac_stime;
	unsigned long		ac_minflt, ac_majflt;
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};

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struct cpu_itimer {
	cputime_t expires;
	cputime_t incr;
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	u32 error;
	u32 incr_error;
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};

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/**
 * struct cputime - snaphsot of system and user cputime
 * @utime: time spent in user mode
 * @stime: time spent in system mode
 *
 * Gathers a generic snapshot of user and system time.
 */
struct cputime {
	cputime_t utime;
	cputime_t stime;
};

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/**
 * 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
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 *
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 * This is an extension of struct cputime that includes the total runtime
 * spent by the task from the scheduler point of view.
 *
 * As a result, this structure groups together three kinds of CPU time
 * that are tracked for threads and thread groups.  Most things considering
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 * CPU time want to group these counts together and treat all three
 * of them in parallel.
 */
struct task_cputime {
	cputime_t utime;
	cputime_t stime;
	unsigned long long sum_exec_runtime;
};
/* Alternate field names when used to cache expirations. */
#define prof_exp	stime
#define virt_exp	utime
#define sched_exp	sum_exec_runtime

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#define INIT_CPUTIME	\
	(struct task_cputime) {					\
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		.utime = 0,					\
		.stime = 0,					\
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		.sum_exec_runtime = 0,				\
	}

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#ifdef CONFIG_PREEMPT_COUNT
#define PREEMPT_DISABLED	(1 + PREEMPT_ENABLED)
#else
#define PREEMPT_DISABLED	PREEMPT_ENABLED
#endif

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/*
 * Disable preemption until the scheduler is running.
 * Reset by start_kernel()->sched_init()->init_idle().
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 *
 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
 * before the scheduler is active -- see should_resched().
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 */
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#define INIT_PREEMPT_COUNT	(PREEMPT_DISABLED + PREEMPT_ACTIVE)
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/**
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 * struct thread_group_cputimer - thread group interval timer counts
 * @cputime:		thread group interval timers.
 * @running:		non-zero when there are timers running and
 * 			@cputime receives updates.
 * @lock:		lock for fields in this struct.
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 *
 * This structure contains the version of task_cputime, above, that is
553
 * used for thread group CPU timer calculations.
554
 */
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struct thread_group_cputimer {
	struct task_cputime cputime;
	int running;
558
	raw_spinlock_t lock;
559 560
};

561
#include <linux/rwsem.h>
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struct autogroup;

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/*
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 * 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 {
572
	atomic_t		sigcnt;
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	atomic_t		live;
574
	int			nr_threads;
575
	struct list_head	thread_head;
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	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */
580
	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;
593
	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 */

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	/*
	 * 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 */
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	int			posix_timer_id;
	struct list_head	posix_timers;
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	/* ITIMER_REAL timer for the process */
616
	struct hrtimer real_timer;
617
	struct pid *leader_pid;
618
	ktime_t it_real_incr;
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	/*
	 * 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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627
	/*
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	 * Thread group totals for process CPU timers.
	 * See thread_group_cputimer(), et al, for details.
630
	 */
631
	struct thread_group_cputimer cputimer;
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	/* Earliest-expiration cache. */
	struct task_cputime cputime_expires;

	struct list_head cpu_timers[3];

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	struct pid *tty_old_pgrp;
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	/* boolean value for session group leader */
	int leader;

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

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#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.
	 */
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	cputime_t utime, stime, cutime, cstime;
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	cputime_t gtime;
	cputime_t cgtime;
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
658
	struct cputime prev_cputime;
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#endif
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	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
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	unsigned long inblock, oublock, cinblock, coublock;
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	unsigned long maxrss, cmaxrss;
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	struct task_io_accounting ioac;
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	/*
	 * 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];

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#ifdef CONFIG_BSD_PROCESS_ACCT
	struct pacct_struct pacct;	/* per-process accounting information */
#endif
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#ifdef CONFIG_TASKSTATS
	struct taskstats *stats;
#endif
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#ifdef CONFIG_AUDIT
	unsigned audit_tty;
693
	unsigned audit_tty_log_passwd;
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	struct tty_audit_buf *tty_audit_buf;
#endif
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#ifdef CONFIG_CGROUPS
	/*
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	 * group_rwsem prevents new tasks from entering the threadgroup and
	 * member tasks from exiting,a more specifically, setting of
	 * PF_EXITING.  fork and exit paths are protected with this rwsem
	 * using threadgroup_change_begin/end().  Users which require
	 * threadgroup to remain stable should use threadgroup_[un]lock()
	 * which also takes care of exec path.  Currently, cgroup is the
	 * only user.
705
	 */
706
	struct rw_semaphore group_rwsem;
707
#endif
708

709
	oom_flags_t oom_flags;
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	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. */
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	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 */
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#define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */
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#define SIGNAL_GROUP_COREDUMP	0x00000008 /* coredump in progress */
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/*
 * 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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#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

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/* 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 files;		/* How many open files does this user have? */
	atomic_t sigpending;	/* How many pending signals does this user have? */
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#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
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#ifdef CONFIG_FANOTIFY
	atomic_t fanotify_listeners;
#endif
757
#ifdef CONFIG_EPOLL
758
	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
759
#endif
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#ifdef CONFIG_POSIX_MQUEUE
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	/* 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 ? */

#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;
773
	kuid_t uid;
774

775
#ifdef CONFIG_PERF_EVENTS
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	atomic_long_t locked_vm;
#endif
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};

780
extern int uids_sysfs_init(void);
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782
extern struct user_struct *find_user(kuid_t);
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extern struct user_struct root_user;
#define INIT_USER (&root_user)

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struct backing_dev_info;
struct reclaim_state;

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#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
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struct sched_info {
	/* cumulative counters */
794
	unsigned long pcount;	      /* # of times run on this cpu */
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	unsigned long long run_delay; /* time spent waiting on a runqueue */
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	/* timestamps */
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	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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};
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#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
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#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).
	 */
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	/*
	 * 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.
	 */
	struct timespec blkio_start, blkio_end;	/* Shared by blkio, swapin */
	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 */
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	struct timespec freepages_start, freepages_end;
	u64 freepages_delay;	/* wait for memory reclaim */
	u32 freepages_count;	/* total count of memory reclaim */
834
};
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#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;
846
#endif
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}
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enum cpu_idle_type {
	CPU_IDLE,
	CPU_NOT_IDLE,
	CPU_NEWLY_IDLE,
	CPU_MAX_IDLE_TYPES
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};

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/*
 * Increase resolution of cpu_power calculations
 */
#define SCHED_POWER_SHIFT	10
#define SCHED_POWER_SCALE	(1L << SCHED_POWER_SHIFT)
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/*
 * sched-domains (multiprocessor balancing) declarations:
 */
865
#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 */
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#define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */
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#define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */
#define SD_SHARE_CPUPOWER	0x0080	/* Domain members share cpu power */
873
#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 */
876
#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 */
878
#define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */
879
#define SD_NUMA			0x4000	/* cross-node balancing */
880

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#ifdef CONFIG_SCHED_SMT
static inline const int cpu_smt_flags(void)
{
	return SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES;
}
#endif

#ifdef CONFIG_SCHED_MC
static inline const int cpu_core_flags(void)
{
	return SD_SHARE_PKG_RESOURCES;
}
#endif

#ifdef CONFIG_NUMA
static inline const int cpu_numa_flags(void)
{
	return SD_NUMA;
}
#endif

902 903 904 905 906 907 908 909
struct sched_domain_attr {
	int relax_domain_level;
};

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

910 911
extern int sched_domain_level_max;

912 913
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 */
917
	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_* */
933
	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 */

940
	/* idle_balance() stats */
941
	u64 max_newidle_lb_cost;
942
	unsigned long next_decay_max_lb_cost;
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#ifdef CONFIG_SCHEDSTATS
	/* load_balance() stats */
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	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 */
956 957 958
	unsigned int alb_count;
	unsigned int alb_failed;
	unsigned int alb_pushed;
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960
	/* SD_BALANCE_EXEC stats */
961 962 963
	unsigned int sbe_count;
	unsigned int sbe_balanced;
	unsigned int sbe_pushed;
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	/* SD_BALANCE_FORK stats */
966 967 968
	unsigned int sbf_count;
	unsigned int sbf_balanced;
	unsigned int sbf_pushed;
969

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	/* try_to_wake_up() stats */
971 972 973
	unsigned int ttwu_wake_remote;
	unsigned int ttwu_move_affine;
	unsigned int ttwu_move_balance;
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#endif
975 976 977
#ifdef CONFIG_SCHED_DEBUG
	char *name;
#endif
978 979 980 981
	union {
		void *private;		/* used during construction */
		struct rcu_head rcu;	/* used during destruction */
	};
982

983
	unsigned int span_weight;
984 985 986 987 988 989 990 991
	/*
	 * 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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};

994 995
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
996
	return to_cpumask(sd->span);
997 998
}

999
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1000
				    struct sched_domain_attr *dattr_new);
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1002 1003 1004 1005
/* 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);

1006 1007
bool cpus_share_cache(int this_cpu, int that_cpu);

1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
typedef const int (*sched_domain_flags_f)(void);

#define SDTL_OVERLAP	0x01

struct sd_data {
	struct sched_domain **__percpu sd;
	struct sched_group **__percpu sg;
	struct sched_group_power **__percpu sgp;
};

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 struct sched_domain_topology_level *sched_domain_topology;

extern void set_sched_topology(struct sched_domain_topology_level *tl);

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

1040
#else /* CONFIG_SMP */
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1042
struct sched_domain_attr;
1043

1044
static inline void
1045
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1046 1047
			struct sched_domain_attr *dattr_new)
{
1048
}
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static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
	return true;
}

1055
#endif	/* !CONFIG_SMP */
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struct io_context;			/* See blkdev.h */


1061
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1062
extern void prefetch_stack(struct task_struct *t);
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#else
static inline void prefetch_stack(struct task_struct *t) { }
#endif
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struct audit_context;		/* See audit.c */
struct mempolicy;
1069
struct pipe_inode_info;
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struct uts_namespace;
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struct load_weight {
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	unsigned long weight;
	u32 inv_weight;
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};

1077 1078 1079
struct sched_avg {
	/*
	 * These sums represent an infinite geometric series and so are bound
1080
	 * above by 1024/(1-y).  Thus we only need a u32 to store them for all
1081 1082 1083 1084
	 * choices of y < 1-2^(-32)*1024.
	 */
	u32 runnable_avg_sum, runnable_avg_period;
	u64 last_runnable_update;
1085
	s64 decay_count;
1086
	unsigned long load_avg_contrib;
1087 1088
};

1089
#ifdef CONFIG_SCHEDSTATS
1090
struct sched_statistics {
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	u64			wait_start;
1092
	u64			wait_max;
1093 1094
	u64			wait_count;
	u64			wait_sum;
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	u64			iowait_count;
	u64			iowait_sum;
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	u64			sleep_start;
	u64			sleep_max;
1100 1101 1102
	s64			sum_sleep_runtime;

	u64			block_start;
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	u64			block_max;
	u64			exec_max;
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	u64			slice_max;
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121

	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;
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
};
#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;
1140 1141
#endif

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#ifdef CONFIG_FAIR_GROUP_SCHED
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	int			depth;
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	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
1150

1151
#ifdef CONFIG_SMP
1152
	/* Per-entity load-tracking */
1153 1154
	struct sched_avg	avg;
#endif
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1155
};
1156

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struct sched_rt_entity {
	struct list_head run_list;
1159
	unsigned long timeout;
1160
	unsigned long watchdog_stamp;
1161
	unsigned int time_slice;
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1163
	struct sched_rt_entity *back;
1164
#ifdef CONFIG_RT_GROUP_SCHED
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	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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};

1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
struct sched_dl_entity {
	struct rb_node	rb_node;

	/*
	 * Original scheduling parameters. Copied here from sched_attr
	 * during sched_setscheduler2(), they will remain the same until
	 * the next sched_setscheduler2().
	 */
	u64 dl_runtime;		/* maximum runtime for each instance	*/
	u64 dl_deadline;	/* relative deadline of each instance	*/
1183
	u64 dl_period;		/* separation of two instances (period) */
1184
	u64 dl_bw;		/* dl_runtime / dl_deadline		*/
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204

	/*
	 * 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.
	 *
	 * @dl_new tells if a new instance arrived. If so we must
	 * start executing it with full runtime and reset its absolute
	 * deadline;
1205 1206 1207
	 *
	 * @dl_boosted tells if we are boosted due to DI. If so we are
	 * outside bandwidth enforcement mechanism (but only until we
1208 1209 1210 1211
	 * exit the critical section);
	 *
	 * @dl_yielded tells if task gave up the cpu before consuming
	 * all its available runtime during the last job.
1212
	 */
1213
	int dl_throttled, dl_new, dl_boosted, dl_yielded;
1214 1215 1216 1217 1218 1219 1220

	/*
	 * Bandwidth enforcement timer. Each -deadline task has its
	 * own bandwidth to be enforced, thus we need one timer per task.
	 */
	struct hrtimer dl_timer;
};
1221

1222 1223
struct rcu_node;

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enum perf_event_task_context {
	perf_invalid_context = -1,
	perf_hw_context = 0,
1227
	perf_sw_context,
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1228 1229 1230
	perf_nr_task_contexts,
};

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struct task_struct {
	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
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	void *stack;
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	atomic_t usage;
1235 1236
	unsigned int flags;	/* per process flags, defined below */
	unsigned int ptrace;
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1237

1238
#ifdef CONFIG_SMP
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1239
	struct llist_node wake_entry;
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	int on_cpu;
1241 1242 1243
	struct task_struct *last_wakee;
	unsigned long wakee_flips;
	unsigned long wakee_flip_decay_ts;
1244 1245

	int wake_cpu;
1246
#endif
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1247
	int on_rq;
1248

1249
	int prio, static_prio, normal_prio;
1250
	unsigned int rt_priority;
1251
	const struct sched_class *sched_class;
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1252
	struct sched_entity se;
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1253
	struct sched_rt_entity rt;
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1254 1255 1256
#ifdef CONFIG_CGROUP_SCHED
	struct task_group *sched_task_group;
#endif
1257
	struct sched_dl_entity dl;
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1259 1260 1261 1262 1263
#ifdef CONFIG_PREEMPT_NOTIFIERS
	/* list of struct preempt_notifier: */
	struct hlist_head preempt_notifiers;
#endif

1264
#ifdef CONFIG_BLK_DEV_IO_TRACE
1265
	unsigned int btrace_seq;
1266
#endif
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1268
	unsigned int policy;
1269
	int nr_cpus_allowed;
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	cpumask_t cpus_allowed;

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1272
#ifdef CONFIG_PREEMPT_RCU
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1273
	int rcu_read_lock_nesting;
1274 1275
	char rcu_read_unlock_special;
	struct list_head rcu_node_entry;
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1276 1277 1278
#endif /* #ifdef CONFIG_PREEMPT_RCU */
#ifdef CONFIG_TREE_PREEMPT_RCU
	struct rcu_node *rcu_blocked_node;
1279
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1280 1281 1282
#ifdef CONFIG_RCU_BOOST
	struct rt_mutex *rcu_boost_mutex;
#endif /* #ifdef CONFIG_RCU_BOOST */
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1284
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
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1285 1286 1287 1288
	struct sched_info sched_info;
#endif

	struct list_head tasks;
1289
#ifdef CONFIG_SMP
1290
	struct plist_node pushable_tasks;
1291
	struct rb_node pushable_dl_tasks;
1292
#endif
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1293 1294

	struct mm_struct *mm, *active_mm;
1295 1296 1297
#ifdef CONFIG_COMPAT_BRK
	unsigned brk_randomized:1;
#endif
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	/* per-thread vma caching */
	u32 vmacache_seqnum;
	struct vm_area_struct *vmacache[VMACACHE_SIZE];
1301 1302 1303
#if defined(SPLIT_RSS_COUNTING)
	struct task_rss_stat	rss_stat;
#endif
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/* task state */
1305
	int exit_state;
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	int exit_code, exit_signal;
	int pdeath_signal;  /*  The signal sent when the parent dies  */
1308
	unsigned int jobctl;	/* JOBCTL_*, siglock protected */
1309 1310

	/* Used for emulating ABI behavior of previous Linux versions */
1311
	unsigned int personality;
1312

1313 1314
	unsigned in_execve:1;	/* Tell the LSMs that the process is doing an
				 * execve */
1315 1316
	unsigned in_iowait:1;

1317 1318
	/* task may not gain privileges */
	unsigned no_new_privs:1;
1319 1320 1321

	/* Revert to default priority/policy when forking */
	unsigned sched_reset_on_fork:1;
1322
	unsigned sched_contributes_to_load:1;
1323

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1324 1325
	pid_t pid;
	pid_t tgid;
1326

1327
#ifdef CONFIG_CC_STACKPROTECTOR
1328 1329
	/* Canary value for the -fstack-protector gcc feature */
	unsigned long stack_canary;
1330
#endif
1331
	/*
L
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1332
	 * pointers to (original) parent process, youngest child, younger sibling,
1333
	 * older sibling, respectively.  (p->father can be replaced with
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1334
	 * p->real_parent->pid)
L
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1335
	 */
1336 1337
	struct task_struct __rcu *real_parent; /* real parent process */
	struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
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	/*
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1339
	 * children/sibling forms the list of my natural children
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1340 1341 1342 1343 1344
	 */
	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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	/*
	 * 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;

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1353
	/* PID/PID hash table linkage. */
1354
	struct pid_link pids[PIDTYPE_MAX];
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1355
	struct list_head thread_group;
1356
	struct list_head thread_node;
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1357 1358 1359 1360 1361

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

1362
	cputime_t utime, stime, utimescaled, stimescaled;
1363
	cputime_t gtime;
1364
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1365
	struct cputime prev_cputime;
1366 1367 1368 1369 1370 1371 1372 1373 1374
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
	seqlock_t vtime_seqlock;
	unsigned long long vtime_snap;
	enum {
		VTIME_SLEEPING = 0,
		VTIME_USER,
		VTIME_SYS,
	} vtime_snap_whence;
1375
#endif
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	unsigned long nvcsw, nivcsw; /* context switch counts */
1377 1378
	struct timespec start_time; 		/* monotonic time */
	struct timespec real_start_time;	/* boot based time */
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/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
	unsigned long min_flt, maj_flt;

1382
	struct task_cputime cputime_expires;
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1383 1384 1385
	struct list_head cpu_timers[3];

/* process credentials */
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1386
	const struct cred __rcu *real_cred; /* objective and real subjective task
1387
					 * credentials (COW) */
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1388
	const struct cred __rcu *cred;	/* effective (overridable) subjective task
1389
					 * credentials (COW) */
1390 1391 1392
	char comm[TASK_COMM_LEN]; /* executable name excluding path
				     - access with [gs]et_task_comm (which lock
				       it with task_lock())
1393
				     - initialized normally by setup_new_exec */
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/* file system info */
	int link_count, total_link_count;
1396
#ifdef CONFIG_SYSVIPC
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1397 1398
/* ipc stuff */
	struct sysv_sem sysvsem;
1399
#endif
1400
#ifdef CONFIG_DETECT_HUNG_TASK
1401 1402 1403
/* hung task detection */
	unsigned long last_switch_count;
#endif
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/* CPU-specific state of this task */
	struct thread_struct thread;
/* filesystem information */
	struct fs_struct *fs;
/* open file information */
	struct files_struct *files;
1410
/* namespaces */
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1411
	struct nsproxy *nsproxy;
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1412 1413 1414 1415 1416
/* signal handlers */
	struct signal_struct *signal;
	struct sighand_struct *sighand;

	sigset_t blocked, real_blocked;
1417
	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
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1418 1419 1420 1421 1422 1423 1424
	struct sigpending pending;

	unsigned long sas_ss_sp;
	size_t sas_ss_size;
	int (*notifier)(void *priv);
	void *notifier_data;
	sigset_t *notifier_mask;
1425
	struct callback_head *task_works;
1426

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1427
	struct audit_context *audit_context;
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1428
#ifdef CONFIG_AUDITSYSCALL
1429
	kuid_t loginuid;
1430
	unsigned int sessionid;
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1431
#endif
1432
	struct seccomp seccomp;
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1433 1434 1435 1436

/* Thread group tracking */
   	u32 parent_exec_id;
   	u32 self_exec_id;
1437 1438
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
 * mempolicy */
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1439 1440
	spinlock_t alloc_lock;

1441
	/* Protection of the PI data structures: */
1442
	raw_spinlock_t pi_lock;
1443

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1444 1445
#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task */
1446 1447
	struct rb_root pi_waiters;
	struct rb_node *pi_waiters_leftmost;
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1448 1449
	/* Deadlock detection and priority inheritance handling */
	struct rt_mutex_waiter *pi_blocked_on;
1450 1451
	/* Top pi_waiters task */
	struct task_struct *pi_top_task;
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1452 1453
#endif

1454 1455 1456 1457
#ifdef CONFIG_DEBUG_MUTEXES
	/* mutex deadlock detection */
	struct mutex_waiter *blocked_on;
#endif
1458 1459 1460 1461
#ifdef CONFIG_TRACE_IRQFLAGS
	unsigned int irq_events;
	unsigned long hardirq_enable_ip;
	unsigned long hardirq_disable_ip;
1462
	unsigned int hardirq_enable_event;
1463
	unsigned int hardirq_disable_event;
1464 1465
	int hardirqs_enabled;
	int hardirq_context;
1466 1467
	unsigned long softirq_disable_ip;
	unsigned long softirq_enable_ip;
1468
	unsigned int softirq_disable_event;
1469
	unsigned int softirq_enable_event;
1470
	int softirqs_enabled;
1471 1472
	int softirq_context;
#endif
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#ifdef CONFIG_LOCKDEP
1474
# define MAX_LOCK_DEPTH 48UL
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1475 1476 1477
	u64 curr_chain_key;
	int lockdep_depth;
	unsigned int lockdep_recursion;
1478
	struct held_lock held_locks[MAX_LOCK_DEPTH];
1479
	gfp_t lockdep_reclaim_gfp;
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1480
#endif
1481

L
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1482 1483 1484
/* journalling filesystem info */
	void *journal_info;

1485
/* stacked block device info */
1486
	struct bio_list *bio_list;
1487

1488 1489 1490 1491 1492
#ifdef CONFIG_BLOCK
/* stack plugging */
	struct blk_plug *plug;
#endif

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1493 1494 1495 1496 1497 1498 1499 1500 1501
/* 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.  */
1502
	struct task_io_accounting ioac;
1503
#if defined(CONFIG_TASK_XACCT)
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1504 1505
	u64 acct_rss_mem1;	/* accumulated rss usage */
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
1506
	cputime_t acct_timexpd;	/* stime + utime since last update */
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1507 1508
#endif
#ifdef CONFIG_CPUSETS
1509
	nodemask_t mems_allowed;	/* Protected by alloc_lock */
1510
	seqcount_t mems_allowed_seq;	/* Seqence no to catch updates */
1511
	int cpuset_mem_spread_rotor;
1512
	int cpuset_slab_spread_rotor;
L
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1513
#endif
1514
#ifdef CONFIG_CGROUPS
1515
	/* Control Group info protected by css_set_lock */
A
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1516
	struct css_set __rcu *cgroups;
1517 1518
	/* cg_list protected by css_set_lock and tsk->alloc_lock */
	struct list_head cg_list;
1519
#endif
1520
#ifdef CONFIG_FUTEX
1521
	struct robust_list_head __user *robust_list;
1522 1523 1524
#ifdef CONFIG_COMPAT
	struct compat_robust_list_head __user *compat_robust_list;
#endif
1525 1526
	struct list_head pi_state_list;
	struct futex_pi_state *pi_state_cache;
1527
#endif
1528
#ifdef CONFIG_PERF_EVENTS
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1529
	struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1530 1531
	struct mutex perf_event_mutex;
	struct list_head perf_event_list;
1532
#endif
1533 1534 1535
#ifdef CONFIG_DEBUG_PREEMPT
	unsigned long preempt_disable_ip;
#endif
1536
#ifdef CONFIG_NUMA
1537
	struct mempolicy *mempolicy;	/* Protected by alloc_lock */
1538
	short il_next;
1539
	short pref_node_fork;
1540
#endif
1541 1542 1543
#ifdef CONFIG_NUMA_BALANCING
	int numa_scan_seq;
	unsigned int numa_scan_period;
1544
	unsigned int numa_scan_period_max;
1545
	int numa_preferred_nid;
1546
	unsigned long numa_migrate_retry;
1547
	u64 node_stamp;			/* migration stamp  */
1548 1549
	u64 last_task_numa_placement;
	u64 last_sum_exec_runtime;
1550
	struct callback_head numa_work;
1551

1552 1553 1554
	struct list_head numa_entry;
	struct numa_group *numa_group;

1555 1556 1557 1558 1559
	/*
	 * Exponential decaying average of faults on a per-node basis.
	 * Scheduling placement decisions are made based on the these counts.
	 * The values remain static for the duration of a PTE scan
	 */
1560
	unsigned long *numa_faults_memory;
1561
	unsigned long total_numa_faults;
1562 1563 1564

	/*
	 * numa_faults_buffer records faults per node during the current
1565 1566
	 * scan window. When the scan completes, the counts in
	 * numa_faults_memory decay and these values are copied.
1567
	 */
1568
	unsigned long *numa_faults_buffer_memory;
1569

1570 1571 1572 1573 1574 1575 1576
	/*
	 * Track the nodes the process was running on when a NUMA hinting
	 * fault was incurred.
	 */
	unsigned long *numa_faults_cpu;
	unsigned long *numa_faults_buffer_cpu;

1577 1578 1579 1580 1581 1582 1583 1584
	/*
	 * numa_faults_locality tracks if faults recorded during the last
	 * scan window were remote/local. 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
	 */
	unsigned long numa_faults_locality[2];

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1585
	unsigned long numa_pages_migrated;
1586 1587
#endif /* CONFIG_NUMA_BALANCING */

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1588
	struct rcu_head rcu;
1589 1590 1591 1592 1593

	/*
	 * cache last used pipe for splice
	 */
	struct pipe_inode_info *splice_pipe;
1594 1595 1596

	struct page_frag task_frag;

1597 1598
#ifdef	CONFIG_TASK_DELAY_ACCT
	struct task_delay_info *delays;
1599 1600 1601
#endif
#ifdef CONFIG_FAULT_INJECTION
	int make_it_fail;
1602
#endif
1603 1604 1605 1606 1607 1608
	/*
	 * 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;
1609
	unsigned long dirty_paused_when; /* start of a write-and-pause period */
1610

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1611 1612 1613 1614
#ifdef CONFIG_LATENCYTOP
	int latency_record_count;
	struct latency_record latency_record[LT_SAVECOUNT];
#endif
1615 1616 1617 1618 1619 1620
	/*
	 * time slack values; these are used to round up poll() and
	 * select() etc timeout values. These are in nanoseconds.
	 */
	unsigned long timer_slack_ns;
	unsigned long default_timer_slack_ns;
1621

1622
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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1623
	/* Index of current stored address in ret_stack */
1624 1625 1626
	int curr_ret_stack;
	/* Stack of return addresses for return function tracing */
	struct ftrace_ret_stack	*ret_stack;
1627 1628
	/* time stamp for last schedule */
	unsigned long long ftrace_timestamp;
1629 1630 1631 1632 1633
	/*
	 * Number of functions that haven't been traced
	 * because of depth overrun.
	 */
	atomic_t trace_overrun;
1634 1635
	/* Pause for the tracing */
	atomic_t tracing_graph_pause;
1636
#endif
1637 1638 1639
#ifdef CONFIG_TRACING
	/* state flags for use by tracers */
	unsigned long trace;
1640
	/* bitmask and counter of trace recursion */
1641 1642
	unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
A
Andrew Morton 已提交
1643
#ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1644 1645 1646
	struct memcg_batch_info {
		int do_batch;	/* incremented when batch uncharge started */
		struct mem_cgroup *memcg; /* target memcg of uncharge */
1647 1648
		unsigned long nr_pages;	/* uncharged usage */
		unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1649
	} memcg_batch;
1650
	unsigned int memcg_kmem_skip_account;
1651
	struct memcg_oom_info {
1652 1653 1654
		struct mem_cgroup *memcg;
		gfp_t gfp_mask;
		int order;
1655 1656
		unsigned int may_oom:1;
	} memcg_oom;
1657
#endif
1658 1659 1660
#ifdef CONFIG_UPROBES
	struct uprobe_task *utask;
#endif
K
Kent Overstreet 已提交
1661 1662 1663 1664
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
	unsigned int	sequential_io;
	unsigned int	sequential_io_avg;
#endif
L
Linus Torvalds 已提交
1665 1666
};

1667
/* Future-safe accessor for struct task_struct's cpus_allowed. */
1668
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1669

1670 1671
#define TNF_MIGRATED	0x01
#define TNF_NO_GROUP	0x02
1672
#define TNF_SHARED	0x04
1673
#define TNF_FAULT_LOCAL	0x08
1674

1675
#ifdef CONFIG_NUMA_BALANCING
1676
extern void task_numa_fault(int last_node, int node, int pages, int flags);
1677
extern pid_t task_numa_group_id(struct task_struct *p);
1678
extern void set_numabalancing_state(bool enabled);
1679
extern void task_numa_free(struct task_struct *p);
1680 1681
extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
					int src_nid, int dst_cpu);
1682
#else
1683
static inline void task_numa_fault(int last_node, int node, int pages,
1684
				   int flags)
1685 1686
{
}
1687 1688 1689 1690
static inline pid_t task_numa_group_id(struct task_struct *p)
{
	return 0;
}
1691 1692 1693
static inline void set_numabalancing_state(bool enabled)
{
}
1694 1695 1696
static inline void task_numa_free(struct task_struct *p)
{
}
1697 1698 1699 1700 1701
static inline bool should_numa_migrate_memory(struct task_struct *p,
				struct page *page, int src_nid, int dst_cpu)
{
	return true;
}
1702 1703
#endif

A
Alexey Dobriyan 已提交
1704
static inline struct pid *task_pid(struct task_struct *task)
1705 1706 1707 1708
{
	return task->pids[PIDTYPE_PID].pid;
}

A
Alexey Dobriyan 已提交
1709
static inline struct pid *task_tgid(struct task_struct *task)
1710 1711 1712 1713
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}

1714 1715 1716 1717 1718
/*
 * 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
1719
static inline struct pid *task_pgrp(struct task_struct *task)
1720 1721 1722 1723
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}

A
Alexey Dobriyan 已提交
1724
static inline struct pid *task_session(struct task_struct *task)
1725 1726 1727 1728
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}

1729 1730 1731 1732 1733 1734 1735
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
1736 1737
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
1738 1739 1740 1741 1742 1743
 * 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
 */
1744 1745
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
			struct pid_namespace *ns);
1746

A
Alexey Dobriyan 已提交
1747
static inline pid_t task_pid_nr(struct task_struct *tsk)
1748 1749 1750 1751
{
	return tsk->pid;
}

1752 1753 1754 1755 1756
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);
}
1757 1758 1759

static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
1760
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1761 1762 1763
}


A
Alexey Dobriyan 已提交
1764
static inline pid_t task_tgid_nr(struct task_struct *tsk)
1765 1766 1767 1768
{
	return tsk->tgid;
}

1769
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1770 1771 1772 1773 1774 1775 1776

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


1777
static inline int pid_alive(const struct task_struct *p);
1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
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);
}

1795 1796
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
1797
{
1798
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1799 1800 1801 1802
}

static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
1803
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1804 1805 1806
}


1807 1808
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
1809
{
1810
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1811 1812 1813 1814
}

static inline pid_t task_session_vnr(struct task_struct *tsk)
{
1815
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1816 1817
}

1818 1819 1820 1821 1822
/* obsolete, do not use */
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
	return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
1823

L
Linus Torvalds 已提交
1824 1825 1826 1827 1828 1829 1830
/**
 * 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.
1831 1832
 *
 * Return: 1 if the process is alive. 0 otherwise.
L
Linus Torvalds 已提交
1833
 */
1834
static inline int pid_alive(const struct task_struct *p)
L
Linus Torvalds 已提交
1835
{
1836
	return p->pids[PIDTYPE_PID].pid != NULL;
L
Linus Torvalds 已提交
1837 1838
}

1839
/**
1840
 * is_global_init - check if a task structure is init
1841 1842 1843
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
1844 1845
 *
 * Return: 1 if the task structure is init. 0 otherwise.
1846
 */
A
Alexey Dobriyan 已提交
1847
static inline int is_global_init(struct task_struct *tsk)
1848 1849 1850
{
	return tsk->pid == 1;
}
1851

1852 1853
extern struct pid *cad_pid;

L
Linus Torvalds 已提交
1854 1855
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
1856

1857
extern void __put_task_struct(struct task_struct *t);
I
Ingo Molnar 已提交
1858 1859 1860 1861

static inline void put_task_struct(struct task_struct *t)
{
	if (atomic_dec_and_test(&t->usage))
1862
		__put_task_struct(t);
I
Ingo Molnar 已提交
1863
}
L
Linus Torvalds 已提交
1864

1865 1866 1867 1868 1869 1870 1871
#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
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
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;
}
1890 1891 1892 1893 1894 1895

static inline cputime_t task_gtime(struct task_struct *t)
{
	return t->gtime;
}
#endif
1896 1897
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);
1898

L
Linus Torvalds 已提交
1899 1900 1901 1902
/*
 * Per process flags
 */
#define PF_EXITING	0x00000004	/* getting shut down */
1903
#define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
1904
#define PF_VCPU		0x00000010	/* I'm a virtual CPU */
T
Tejun Heo 已提交
1905
#define PF_WQ_WORKER	0x00000020	/* I'm a workqueue worker */
L
Linus Torvalds 已提交
1906
#define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
1907
#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
L
Linus Torvalds 已提交
1908 1909 1910 1911
#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 */
1912
#define PF_NPROC_EXCEEDED 0x00001000	/* set_user noticed that RLIMIT_NPROC was exceeded */
L
Linus Torvalds 已提交
1913
#define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
1914
#define PF_USED_ASYNC	0x00004000	/* used async_schedule*(), used by module init */
L
Linus Torvalds 已提交
1915 1916 1917 1918
#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 */
1919
#define PF_MEMALLOC_NOIO 0x00080000	/* Allocating memory without IO involved */
L
Linus Torvalds 已提交
1920
#define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
1921
#define PF_KTHREAD	0x00200000	/* I am a kernel thread */
J
Jens Axboe 已提交
1922 1923 1924 1925
#define PF_RANDOMIZE	0x00400000	/* randomize virtual address space */
#define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
#define PF_SPREAD_PAGE	0x01000000	/* Spread page cache over cpuset */
#define PF_SPREAD_SLAB	0x02000000	/* Spread some slab caches over cpuset */
1926
#define PF_NO_SETAFFINITY 0x04000000	/* Userland is not allowed to meddle with cpus_allowed */
1927
#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
1928
#define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
1929
#define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezable */
1930
#define PF_SUSPEND_TASK 0x80000000      /* this thread called freeze_processes and should not be frozen */
L
Linus Torvalds 已提交
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956

/*
 * 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)

1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags */
static inline gfp_t memalloc_noio_flags(gfp_t flags)
{
	if (unlikely(current->flags & PF_MEMALLOC_NOIO))
		flags &= ~__GFP_IO;
	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;
}

1977
/*
1978
 * task->jobctl flags
1979
 */
1980
#define JOBCTL_STOP_SIGMASK	0xffff	/* signr of the last group stop */
1981

1982 1983 1984
#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 */
1985
#define JOBCTL_TRAP_STOP_BIT	19	/* trap for STOP */
1986
#define JOBCTL_TRAP_NOTIFY_BIT	20	/* trap for NOTIFY */
1987
#define JOBCTL_TRAPPING_BIT	21	/* switching to TRACED */
T
Tejun Heo 已提交
1988
#define JOBCTL_LISTENING_BIT	22	/* ptracer is listening for events */
1989 1990 1991 1992

#define JOBCTL_STOP_DEQUEUED	(1 << JOBCTL_STOP_DEQUEUED_BIT)
#define JOBCTL_STOP_PENDING	(1 << JOBCTL_STOP_PENDING_BIT)
#define JOBCTL_STOP_CONSUME	(1 << JOBCTL_STOP_CONSUME_BIT)
1993
#define JOBCTL_TRAP_STOP	(1 << JOBCTL_TRAP_STOP_BIT)
1994
#define JOBCTL_TRAP_NOTIFY	(1 << JOBCTL_TRAP_NOTIFY_BIT)
1995
#define JOBCTL_TRAPPING		(1 << JOBCTL_TRAPPING_BIT)
T
Tejun Heo 已提交
1996
#define JOBCTL_LISTENING	(1 << JOBCTL_LISTENING_BIT)
1997

1998
#define JOBCTL_TRAP_MASK	(JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1999
#define JOBCTL_PENDING_MASK	(JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2000

2001 2002
extern bool task_set_jobctl_pending(struct task_struct *task,
				    unsigned int mask);
2003
extern void task_clear_jobctl_trapping(struct task_struct *task);
2004 2005
extern void task_clear_jobctl_pending(struct task_struct *task,
				      unsigned int mask);
2006

P
Paul E. McKenney 已提交
2007
#ifdef CONFIG_PREEMPT_RCU
2008 2009

#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
2010
#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
2011 2012 2013 2014 2015

static inline void rcu_copy_process(struct task_struct *p)
{
	p->rcu_read_lock_nesting = 0;
	p->rcu_read_unlock_special = 0;
P
Paul E. McKenney 已提交
2016
#ifdef CONFIG_TREE_PREEMPT_RCU
2017
	p->rcu_blocked_node = NULL;
2018 2019 2020 2021
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
#ifdef CONFIG_RCU_BOOST
	p->rcu_boost_mutex = NULL;
#endif /* #ifdef CONFIG_RCU_BOOST */
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
	INIT_LIST_HEAD(&p->rcu_node_entry);
}

#else

static inline void rcu_copy_process(struct task_struct *p)
{
}

#endif

2033 2034 2035 2036 2037 2038 2039
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;
}

L
Linus Torvalds 已提交
2040
#ifdef CONFIG_SMP
2041 2042 2043
extern void do_set_cpus_allowed(struct task_struct *p,
			       const struct cpumask *new_mask);

2044
extern int set_cpus_allowed_ptr(struct task_struct *p,
2045
				const struct cpumask *new_mask);
L
Linus Torvalds 已提交
2046
#else
2047 2048 2049 2050
static inline void do_set_cpus_allowed(struct task_struct *p,
				      const struct cpumask *new_mask)
{
}
2051
static inline int set_cpus_allowed_ptr(struct task_struct *p,
2052
				       const struct cpumask *new_mask)
L
Linus Torvalds 已提交
2053
{
2054
	if (!cpumask_test_cpu(0, new_mask))
L
Linus Torvalds 已提交
2055 2056 2057 2058
		return -EINVAL;
	return 0;
}
#endif
2059

2060
#ifdef CONFIG_NO_HZ_COMMON
2061 2062 2063 2064 2065
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) { }
2066
#endif /* CONFIG_NO_HZ_COMMON */
2067

2068
#ifndef CONFIG_CPUMASK_OFFSTACK
2069 2070 2071 2072
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
{
	return set_cpus_allowed_ptr(p, &new_mask);
}
2073
#endif
L
Linus Torvalds 已提交
2074

2075
/*
2076 2077 2078 2079 2080 2081
 * 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.
2082
 */
2083
extern unsigned long long notrace sched_clock(void);
2084
/*
2085
 * See the comment in kernel/sched/clock.c
2086 2087 2088 2089 2090
 */
extern u64 cpu_clock(int cpu);
extern u64 local_clock(void);
extern u64 sched_clock_cpu(int cpu);

2091

2092
extern void sched_clock_init(void);
2093

2094
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
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
2107 2108 2109 2110 2111 2112
/*
 * 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:
 */
2113 2114 2115
extern int sched_clock_stable(void);
extern void set_sched_clock_stable(void);
extern void clear_sched_clock_stable(void);
2116

2117 2118 2119 2120 2121
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

2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
#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

2135
extern unsigned long long
2136
task_sched_runtime(struct task_struct *task);
L
Linus Torvalds 已提交
2137 2138 2139 2140 2141 2142 2143 2144

/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP
extern void sched_exec(void);
#else
#define sched_exec()   {}
#endif

2145 2146
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2147

L
Linus Torvalds 已提交
2148 2149 2150 2151 2152 2153
#ifdef CONFIG_HOTPLUG_CPU
extern void idle_task_exit(void);
#else
static inline void idle_task_exit(void) {}
#endif

2154
#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2155
extern void wake_up_nohz_cpu(int cpu);
2156
#else
2157
static inline void wake_up_nohz_cpu(int cpu) { }
2158 2159
#endif

2160 2161
#ifdef CONFIG_NO_HZ_FULL
extern bool sched_can_stop_tick(void);
2162
extern u64 scheduler_tick_max_deferment(void);
2163 2164
#else
static inline bool sched_can_stop_tick(void) { return false; }
2165 2166
#endif

2167 2168 2169 2170 2171 2172 2173
#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);
2174
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2175 2176 2177 2178 2179 2180 2181 2182
#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

2183
extern bool yield_to(struct task_struct *p, bool preempt);
2184 2185
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
/**
 * 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);
}
2196 2197
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);
2199 2200
extern int sched_setscheduler(struct task_struct *, int,
			      const struct sched_param *);
2201
extern int sched_setscheduler_nocheck(struct task_struct *, int,
2202
				      const struct sched_param *);
2203 2204
extern int sched_setattr(struct task_struct *,
			 const struct sched_attr *);
2205
extern struct task_struct *idle_task(int cpu);
2206 2207
/**
 * is_idle_task - is the specified task an idle task?
2208
 * @p: the task in question.
2209 2210
 *
 * Return: 1 if @p is an idle task. 0 otherwise.
2211
 */
2212
static inline bool is_idle_task(const struct task_struct *p)
2213 2214 2215
{
	return p->pid == 0;
}
2216 2217
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);

/*
 * The default (Linux) execution domain.
 */
extern struct exec_domain	default_exec_domain;

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;

2246 2247 2248 2249 2250 2251 2252
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
2253 2254
 * find_task_by_vpid():
 *      finds a task by its virtual pid
2255
 *
2256
 * see also find_vpid() etc in include/linux/pid.h
2257 2258
 */

2259 2260 2261
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);
2262

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/* per-UID process charging. */
2264
extern struct user_struct * alloc_uid(kuid_t);
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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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extern void xtime_update(unsigned long ticks);
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2276 2277
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
2278
extern void wake_up_new_task(struct task_struct *tsk);
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#ifdef CONFIG_SMP
 extern void kick_process(struct task_struct *tsk);
#else
 static inline void kick_process(struct task_struct *tsk) { }
#endif
2284
extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
2285
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 *);
2289
extern void __flush_signals(struct task_struct *);
2290
extern void ignore_signals(struct task_struct *);
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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);

static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&tsk->sighand->siglock, flags);
	ret = dequeue_signal(tsk, mask, info);
	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);

	return ret;
2304
}
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extern void block_all_signals(int (*notifier)(void *priv), void *priv,
			      sigset_t *mask);
extern void unblock_all_signals(void);
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 *);
2313 2314
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);
2315 2316
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
				const struct cred *, u32);
2317 2318
extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
2319
extern int kill_proc_info(int, struct siginfo *, pid_t);
2320
extern __must_check bool do_notify_parent(struct task_struct *, int);
2321
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
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extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
2324
extern int zap_other_threads(struct task_struct *p);
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extern struct sigqueue *sigqueue_alloc(void);
extern void sigqueue_free(struct sigqueue *);
2327
extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2328
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
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static inline void restore_saved_sigmask(void)
{
	if (test_and_clear_restore_sigmask())
2333
		__set_current_blocked(&current->saved_sigmask);
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}

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static inline sigset_t *sigmask_to_save(void)
{
	sigset_t *res = &current->blocked;
	if (unlikely(test_restore_sigmask()))
		res = &current->saved_sigmask;
	return res;
}

2344 2345 2346 2347 2348
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)

2354 2355 2356
/*
 * True if we are on the alternate signal stack.
 */
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static inline int on_sig_stack(unsigned long sp)
{
2359 2360 2361 2362 2363 2364 2365
#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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}

static inline int sas_ss_flags(unsigned long sp)
{
	return (current->sas_ss_size == 0 ? SS_DISABLE
		: on_sig_stack(sp) ? SS_ONSTACK : 0);
}

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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 */
2391
extern void __mmdrop(struct mm_struct *);
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static inline void mmdrop(struct mm_struct * mm)
{
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Ingo Molnar 已提交
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	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
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		__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);
2402 2403 2404 2405 2406 2407
/*
 * 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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/* Remove the current tasks stale references to the old mm_struct */
extern void mm_release(struct task_struct *, struct mm_struct *);

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extern int copy_thread(unsigned long, unsigned long, unsigned long,
2412
			struct task_struct *);
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extern void flush_thread(void);
extern void exit_thread(void);

extern void exit_files(struct task_struct *);
2417
extern void __cleanup_sighand(struct sighand_struct *);
2418

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extern void exit_itimers(struct signal_struct *);
2420
extern void flush_itimer_signals(void);
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2421

2422
extern void do_group_exit(int);
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extern int allow_signal(int);
extern int disallow_signal(int);

2427
extern int do_execve(struct filename *,
2428
		     const char __user * const __user *,
2429
		     const char __user * const __user *);
2430
extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2431
struct task_struct *fork_idle(int);
2432
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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2434
extern void set_task_comm(struct task_struct *tsk, const char *from);
2435
extern char *get_task_comm(char *to, struct task_struct *tsk);
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2436 2437

#ifdef CONFIG_SMP
2438
void scheduler_ipi(void);
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extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
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2440
#else
2441
static inline void scheduler_ipi(void) { }
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static inline unsigned long wait_task_inactive(struct task_struct *p,
					       long match_state)
{
	return 1;
}
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#endif

2449 2450
#define next_task(p) \
	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
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#define for_each_process(p) \
	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

2455
extern bool current_is_single_threaded(void);
D
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/*
 * 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)

2467 2468 2469 2470 2471 2472 2473 2474 2475 2476
#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)

2477 2478
static inline int get_nr_threads(struct task_struct *tsk)
{
2479
	return tsk->signal->nr_threads;
2480 2481
}

2482 2483 2484 2485
static inline bool thread_group_leader(struct task_struct *p)
{
	return p->exit_signal >= 0;
}
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2487 2488 2489 2490 2491 2492
/* 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.
 */
2493
static inline bool has_group_leader_pid(struct task_struct *p)
2494
{
2495
	return task_pid(p) == p->signal->leader_pid;
2496 2497
}

2498
static inline
2499
bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
2500
{
2501
	return p1->signal == p2->signal;
2502 2503
}

2504
static inline struct task_struct *next_thread(const struct task_struct *p)
O
Oleg Nesterov 已提交
2505
{
2506 2507
	return list_entry_rcu(p->thread_group.next,
			      struct task_struct, thread_group);
O
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2508 2509
}

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2510
static inline int thread_group_empty(struct task_struct *p)
L
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2511
{
O
Oleg Nesterov 已提交
2512
	return list_empty(&p->thread_group);
L
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2513 2514 2515 2516 2517 2518
}

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

/*
2519
 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2520
 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2521
 * pins the final release of task.io_context.  Also protects ->cpuset and
O
Oleg Nesterov 已提交
2522
 * ->cgroup.subsys[]. And ->vfork_done.
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2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
 *
 * 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);
}

2538
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2539 2540
							unsigned long *flags);

2541 2542 2543 2544 2545 2546 2547 2548 2549
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;
}
2550

2551 2552 2553 2554 2555 2556
static inline void unlock_task_sighand(struct task_struct *tsk,
						unsigned long *flags)
{
	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
}

2557
#ifdef CONFIG_CGROUPS
2558
static inline void threadgroup_change_begin(struct task_struct *tsk)
2559
{
2560
	down_read(&tsk->signal->group_rwsem);
2561
}
2562
static inline void threadgroup_change_end(struct task_struct *tsk)
2563
{
2564
	up_read(&tsk->signal->group_rwsem);
2565
}
2566 2567 2568 2569 2570 2571 2572

/**
 * threadgroup_lock - lock threadgroup
 * @tsk: member task of the threadgroup to lock
 *
 * Lock the threadgroup @tsk belongs to.  No new task is allowed to enter
 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2573 2574
 * change ->group_leader/pid.  This is useful for cases where the threadgroup
 * needs to stay stable across blockable operations.
2575 2576 2577 2578 2579
 *
 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
 * synchronization.  While held, no new task will be added to threadgroup
 * and no existing live task will have its PF_EXITING set.
 *
2580 2581
 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
 * sub-thread becomes a new leader.
2582
 */
2583
static inline void threadgroup_lock(struct task_struct *tsk)
2584
{
2585
	down_write(&tsk->signal->group_rwsem);
2586
}
2587 2588 2589 2590 2591 2592 2593

/**
 * threadgroup_unlock - unlock threadgroup
 * @tsk: member task of the threadgroup to unlock
 *
 * Reverse threadgroup_lock().
 */
2594
static inline void threadgroup_unlock(struct task_struct *tsk)
2595
{
2596
	up_write(&tsk->signal->group_rwsem);
2597 2598
}
#else
2599 2600 2601 2602
static inline void threadgroup_change_begin(struct task_struct *tsk) {}
static inline void threadgroup_change_end(struct task_struct *tsk) {}
static inline void threadgroup_lock(struct task_struct *tsk) {}
static inline void threadgroup_unlock(struct task_struct *tsk) {}
2603 2604
#endif

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#ifndef __HAVE_THREAD_FUNCTIONS

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2607 2608
#define task_thread_info(task)	((struct thread_info *)(task)->stack)
#define task_stack_page(task)	((task)->stack)
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2610 2611 2612 2613 2614 2615 2616 2617
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;
}

static inline unsigned long *end_of_stack(struct task_struct *p)
{
R
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2618
	return (unsigned long *)(task_thread_info(p) + 1);
2619 2620
}

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2621 2622
#endif

2623 2624 2625 2626 2627 2628 2629
static inline int object_is_on_stack(void *obj)
{
	void *stack = task_stack_page(current);

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

2630 2631
extern void thread_info_cache_init(void);

2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644
#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 */
		n++;
	} while (!*n);

	return (unsigned long)n - (unsigned long)end_of_stack(p);
}
#endif

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/* 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)
{
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	set_ti_thread_flag(task_thread_info(tsk), flag);
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}

static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
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	clear_ti_thread_flag(task_thread_info(tsk), flag);
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}

static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
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	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
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}

static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
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	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
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}

static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
{
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	return test_ti_thread_flag(task_thread_info(tsk), flag);
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}

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);
}

2683 2684 2685 2686 2687
static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}

2688 2689 2690 2691 2692 2693
static inline int restart_syscall(void)
{
	set_tsk_thread_flag(current, TIF_SIGPENDING);
	return -ERESTARTNOINTR;
}

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Linus Torvalds 已提交
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static inline int signal_pending(struct task_struct *p)
{
	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
}
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Matthew Wilcox 已提交
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2699 2700 2701 2702
static inline int __fatal_signal_pending(struct task_struct *p)
{
	return unlikely(sigismember(&p->pending.signal, SIGKILL));
}
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Matthew Wilcox 已提交
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static inline int fatal_signal_pending(struct task_struct *p)
{
	return signal_pending(p) && __fatal_signal_pending(p);
}

2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
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);
}

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Linus Torvalds 已提交
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/*
 * 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.
 */
2726
extern int _cond_resched(void);
2727

2728 2729 2730 2731
#define cond_resched() ({			\
	__might_sleep(__FILE__, __LINE__, 0);	\
	_cond_resched();			\
})
2732

2733 2734
extern int __cond_resched_lock(spinlock_t *lock);

2735
#ifdef CONFIG_PREEMPT_COUNT
2736
#define PREEMPT_LOCK_OFFSET	PREEMPT_OFFSET
2737
#else
2738
#define PREEMPT_LOCK_OFFSET	0
2739
#endif
2740

2741
#define cond_resched_lock(lock) ({				\
2742
	__might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);	\
2743 2744 2745 2746 2747
	__cond_resched_lock(lock);				\
})

extern int __cond_resched_softirq(void);

2748 2749 2750
#define cond_resched_softirq() ({					\
	__might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);	\
	__cond_resched_softirq();					\
2751
})
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Linus Torvalds 已提交
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2753 2754 2755 2756 2757 2758 2759 2760 2761
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
}

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Linus Torvalds 已提交
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/*
 * Does a critical section need to be broken due to another
N
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 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
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 */
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static inline int spin_needbreak(spinlock_t *lock)
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Linus Torvalds 已提交
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{
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#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
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	return 0;
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#endif
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}

2776 2777
/*
 * Idle thread specific functions to determine the need_resched
2778
 * polling state.
2779
 */
2780
#ifdef TIF_POLLING_NRFLAG
2781 2782 2783 2784
static inline int tsk_is_polling(struct task_struct *p)
{
	return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
}
2785 2786

static inline void __current_set_polling(void)
2787 2788 2789 2790
{
	set_thread_flag(TIF_POLLING_NRFLAG);
}

2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806
static inline bool __must_check current_set_polling_and_test(void)
{
	__current_set_polling();

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
	 * paired by resched_task()
	 *
	 * XXX: assumes set/clear bit are identical barrier wise.
	 */
	smp_mb__after_clear_bit();

	return unlikely(tif_need_resched());
}

static inline void __current_clr_polling(void)
2807 2808 2809
{
	clear_thread_flag(TIF_POLLING_NRFLAG);
}
2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823

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

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
	 * paired by resched_task()
	 */
	smp_mb__after_clear_bit();

	return unlikely(tif_need_resched());
}

2824 2825
#else
static inline int tsk_is_polling(struct task_struct *p) { return 0; }
2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
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());
}
2837 2838
#endif

2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853
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.
	 */
	smp_mb(); /* paired with resched_task() */

	preempt_fold_need_resched();
}

2854 2855 2856 2857 2858
static __always_inline bool need_resched(void)
{
	return unlikely(tif_need_resched());
}

2859 2860 2861
/*
 * Thread group CPU time accounting.
 */
2862
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2863
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2864

2865
static inline void thread_group_cputime_init(struct signal_struct *sig)
2866
{
2867
	raw_spin_lock_init(&sig->cputimer.lock);
2868 2869
}

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Roland McGrath 已提交
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/*
 * 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);
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extern void recalc_sigpending(void);

2879 2880 2881 2882 2883 2884 2885 2886 2887 2888
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);
}
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/*
 * 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)
{
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	return task_thread_info(p)->cpu;
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}

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Ingo Molnar 已提交
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static inline int task_node(const struct task_struct *p)
{
	return cpu_to_node(task_cpu(p));
}

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Ingo Molnar 已提交
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extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
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#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 */

2920 2921
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2922

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Dhaval Giani 已提交
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#ifdef CONFIG_CGROUP_SCHED
2924
extern struct task_group root_task_group;
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#endif /* CONFIG_CGROUP_SCHED */
2926

2927 2928 2929
extern int task_can_switch_user(struct user_struct *up,
					struct task_struct *tsk);

2930 2931 2932
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
2933
	tsk->ioac.rchar += amt;
2934 2935 2936 2937
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
2938
	tsk->ioac.wchar += amt;
2939 2940 2941 2942
}

static inline void inc_syscr(struct task_struct *tsk)
{
2943
	tsk->ioac.syscr++;
2944 2945 2946 2947
}

static inline void inc_syscw(struct task_struct *tsk)
{
2948
	tsk->ioac.syscw++;
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
}
#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

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#ifndef TASK_SIZE_OF
#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
#ifdef CONFIG_MM_OWNER
extern void mm_update_next_owner(struct mm_struct *mm);
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
#else
static inline void mm_update_next_owner(struct mm_struct *mm)
{
}

static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
{
}
#endif /* CONFIG_MM_OWNER */

2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
static inline unsigned long task_rlimit(const struct task_struct *tsk,
		unsigned int limit)
{
	return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
}

static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
		unsigned int limit)
{
	return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
}

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);
}

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#endif