sched.h 74.6 KB
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#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

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/*
 * cloning flags:
 */
#define CSIGNAL		0x000000ff	/* signal mask to be sent at exit */
#define CLONE_VM	0x00000100	/* set if VM shared between processes */
#define CLONE_FS	0x00000200	/* set if fs info shared between processes */
#define CLONE_FILES	0x00000400	/* set if open files shared between processes */
#define CLONE_SIGHAND	0x00000800	/* set if signal handlers and blocked signals shared */
#define CLONE_PTRACE	0x00002000	/* set if we want to let tracing continue on the child too */
#define CLONE_VFORK	0x00004000	/* set if the parent wants the child to wake it up on mm_release */
#define CLONE_PARENT	0x00008000	/* set if we want to have the same parent as the cloner */
#define CLONE_THREAD	0x00010000	/* Same thread group? */
#define CLONE_NEWNS	0x00020000	/* New namespace group? */
#define CLONE_SYSVSEM	0x00040000	/* share system V SEM_UNDO semantics */
#define CLONE_SETTLS	0x00080000	/* create a new TLS for the child */
#define CLONE_PARENT_SETTID	0x00100000	/* set the TID in the parent */
#define CLONE_CHILD_CLEARTID	0x00200000	/* clear the TID in the child */
#define CLONE_DETACHED		0x00400000	/* Unused, ignored */
#define CLONE_UNTRACED		0x00800000	/* set if the tracing process can't force CLONE_PTRACE on this clone */
#define CLONE_CHILD_SETTID	0x01000000	/* set the TID in the child */
#define CLONE_STOPPED		0x02000000	/* Start in stopped state */
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#define CLONE_NEWUTS		0x04000000	/* New utsname group? */
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#define CLONE_NEWIPC		0x08000000	/* New ipcs */
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#define CLONE_NEWUSER		0x10000000	/* New user namespace */
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#define CLONE_NEWPID		0x20000000	/* New pid namespace */
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#define CLONE_NEWNET		0x40000000	/* New network namespace */
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#define CLONE_IO		0x80000000	/* Clone io context */
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/*
 * Scheduling policies
 */
#define SCHED_NORMAL		0
#define SCHED_FIFO		1
#define SCHED_RR		2
#define SCHED_BATCH		3
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/* SCHED_ISO: reserved but not implemented yet */
#define SCHED_IDLE		5
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/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
#define SCHED_RESET_ON_FORK     0x40000000
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#ifdef __KERNEL__
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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>
#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 <asm/system.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/cputime.h>

#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/signal.h>
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#include <linux/path.h>
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#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/kobject.h>
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#include <linux/latencytop.h>
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#include <linux/cred.h>
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#include <asm/processor.h>
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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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/*
 * 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_uninterruptible(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(void);
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extern unsigned long get_parent_ip(unsigned long addr);

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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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#else
static inline void
proc_sched_show_task(struct task_struct *p, struct seq_file *m)
{
}
static inline void proc_sched_set_task(struct task_struct *p)
{
}
static inline 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 */
#define EXIT_ZOMBIE		16
#define EXIT_DEAD		32
/* 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_STATE_MAX		512
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#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
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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 | \
				 __TASK_TRACED)
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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_dead(task)	((task)->exit_state != 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_FREEZING) == 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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extern cpumask_var_t nohz_cpu_mask;
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
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extern void select_nohz_load_balancer(int stop_tick);
extern int get_nohz_timer_target(void);
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#else
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static inline void select_nohz_load_balancer(int stop_tick) { }
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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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extern int softlockup_thresh;
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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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#endif

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#ifdef CONFIG_DETECT_HUNG_TASK
extern unsigned int  sysctl_hung_task_panic;
extern unsigned long sysctl_hung_task_check_count;
extern unsigned long sysctl_hung_task_timeout_secs;
extern unsigned long sysctl_hung_task_warnings;
extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
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					 void __user *buffer,
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					 size_t *lenp, loff_t *ppos);
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#else
/* Avoid need for ifdefs elsewhere in the code */
enum { sysctl_hung_task_timeout_secs = 0 };
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#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 int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
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struct nsproxy;
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struct user_namespace;
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/*
 * Default maximum number of active map areas, this limits the number of vmas
 * per mm struct. Users can overwrite this number by sysctl but there is a
 * problem.
 *
 * When a program's coredump is generated as ELF format, a section is created
 * per a vma. In ELF, the number of sections is represented in unsigned short.
 * This means the number of sections should be smaller than 65535 at coredump.
 * Because the kernel adds some informative sections to a image of program at
 * generating coredump, we need some margin. The number of extra sections is
 * 1-3 now and depends on arch. We use "5" as safe margin, here.
 */
#define MAPCOUNT_ELF_CORE_MARGIN	(5)
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#define DEFAULT_MAX_MAP_COUNT	(USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
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extern int sysctl_max_map_count;

#include <linux/aio.h>

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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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extern void arch_unmap_area(struct mm_struct *, unsigned long);
extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
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#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
#endif
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extern void set_dumpable(struct mm_struct *mm, int value);
extern int get_dumpable(struct mm_struct *mm);

/* mm flags */
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/* dumpable bits */
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#define MMF_DUMPABLE      0  /* core dump is permitted */
#define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
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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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/* 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 */

#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 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 structure groups together three kinds of CPU time that are
 * tracked for threads and thread groups.  Most things considering
 * CPU time want to group these counts together and treat all three
 * of them in parallel.
 */
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) {					\
		.utime = cputime_zero,				\
		.stime = cputime_zero,				\
		.sum_exec_runtime = 0,				\
	}

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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	(1 + 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
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 * used for thread group CPU timer calculations.
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 */
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struct thread_group_cputimer {
	struct task_cputime cputime;
	int running;
	spinlock_t lock;
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};

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/*
 * NOTE! "signal_struct" does not have it's own
 * 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 {
520
	atomic_t		sigcnt;
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	atomic_t		live;
522
	int			nr_threads;
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	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */
527
	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;
540
	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 */

	/* POSIX.1b Interval Timers */
	struct list_head posix_timers;

	/* ITIMER_REAL timer for the process */
550
	struct hrtimer real_timer;
551
	struct pid *leader_pid;
552
	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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561
	/*
562 563
	 * Thread group totals for process CPU timers.
	 * See thread_group_cputimer(), et al, for details.
564
	 */
565
	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;
573

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

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

	/*
	 * 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.
	 */
585
	cputime_t utime, stime, cutime, cstime;
586 587
	cputime_t gtime;
	cputime_t cgtime;
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING
	cputime_t prev_utime, prev_stime;
#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;
	struct tty_audit_buf *tty_audit_buf;
#endif
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	int oom_adj;		/* OOM kill score adjustment (bit shift) */
	int oom_score_adj;	/* OOM kill score adjustment */
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	struct mutex cred_guard_mutex;	/* guard against foreign influences on
					 * credential calculations
					 * (notably. ptrace) */
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};

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/* Context switch must be unlocked if interrupts are to be enabled */
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
# define __ARCH_WANT_UNLOCKED_CTXSW
#endif

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/*
 * Bits in flags field of signal_struct.
 */
#define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */
#define SIGNAL_STOP_DEQUEUED	0x00000002 /* stop signal dequeued */
#define SIGNAL_STOP_CONTINUED	0x00000004 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT	0x00000008 /* group exit 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
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#ifdef CONFIG_EPOLL
	atomic_t epoll_watches;	/* The number of file descriptors currently watched */
#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;
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	uid_t uid;
695
	struct user_namespace *user_ns;
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697
#ifdef CONFIG_PERF_EVENTS
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	atomic_long_t locked_vm;
#endif
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};

702
extern int uids_sysfs_init(void);
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extern struct user_struct *find_user(uid_t);

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 */
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	unsigned long pcount;	      /* # of times run on this cpu */
717
	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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#ifdef CONFIG_SCHEDSTATS
	/* BKL stats */
724
	unsigned int bkl_count;
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#endif
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};
727
#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 */
760
};
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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;
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#endif
773
}
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enum cpu_idle_type {
	CPU_IDLE,
	CPU_NOT_IDLE,
	CPU_NEWLY_IDLE,
	CPU_MAX_IDLE_TYPES
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};

/*
 * sched-domains (multiprocessor balancing) declarations:
 */
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/*
 * Increase resolution of nice-level calculations:
 */
#define SCHED_LOAD_SHIFT	10
#define SCHED_LOAD_SCALE	(1L << SCHED_LOAD_SHIFT)

792
#define SCHED_LOAD_SCALE_FUZZ	SCHED_LOAD_SCALE
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#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 */
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#define SD_PREFER_LOCAL		0x0040  /* Prefer to keep tasks local to this domain */
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#define SD_SHARE_CPUPOWER	0x0080	/* Domain members share cpu power */
#define SD_POWERSAVINGS_BALANCE	0x0100	/* Balance for power savings */
#define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
#define SD_SERIALIZE		0x0400	/* Only a single load balancing instance */
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#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 */
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enum powersavings_balance_level {
	POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
	POWERSAVINGS_BALANCE_BASIC,	/* Fill one thread/core/package
					 * first for long running threads
					 */
	POWERSAVINGS_BALANCE_WAKEUP,	/* Also bias task wakeups to semi-idle
					 * cpu package for power savings
					 */
	MAX_POWERSAVINGS_BALANCE_LEVELS
};
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820
extern int sched_mc_power_savings, sched_smt_power_savings;
821

822 823 824 825
static inline int sd_balance_for_mc_power(void)
{
	if (sched_smt_power_savings)
		return SD_POWERSAVINGS_BALANCE;
826

827 828 829 830
	if (!sched_mc_power_savings)
		return SD_PREFER_SIBLING;

	return 0;
831
}
832

833 834 835 836 837
static inline int sd_balance_for_package_power(void)
{
	if (sched_mc_power_savings | sched_smt_power_savings)
		return SD_POWERSAVINGS_BALANCE;

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	return SD_PREFER_SIBLING;
839
}
840

841 842
extern int __weak arch_sd_sibiling_asym_packing(void);

843 844 845 846 847 848 849 850 851 852 853 854 855
/*
 * Optimise SD flags for power savings:
 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
 * Keep default SD flags if sched_{smt,mc}_power_saving=0
 */

static inline int sd_power_saving_flags(void)
{
	if (sched_mc_power_savings | sched_smt_power_savings)
		return SD_BALANCE_NEWIDLE;

	return 0;
}
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struct sched_group {
	struct sched_group *next;	/* Must be a circular list */

	/*
	 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
862
	 * single CPU.
863
	 */
864
	unsigned int cpu_power, cpu_power_orig;
865

866 867 868 869 870 871 872 873 874 875 876
	/*
	 * The CPUs this group covers.
	 *
	 * 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)
	 *
	 * It is also be embedded into static data structures at build
	 * time. (See 'struct static_sched_group' in kernel/sched.c)
	 */
	unsigned long cpumask[0];
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};

879 880
static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
{
881
	return to_cpumask(sg->cpumask);
882 883
}

884 885 886 887
enum sched_domain_level {
	SD_LV_NONE = 0,
	SD_LV_SIBLING,
	SD_LV_MC,
888
	SD_LV_BOOK,
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	SD_LV_CPU,
	SD_LV_NODE,
	SD_LV_ALLNODES,
	SD_LV_MAX
};

struct sched_domain_attr {
	int relax_domain_level;
};

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

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struct sched_domain {
	/* These fields must be setup */
	struct sched_domain *parent;	/* top domain must be null terminated */
906
	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 flags;			/* See SD_* */
920
	enum sched_domain_level 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 */

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	u64 last_update;

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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 */
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	unsigned int alb_count;
	unsigned int alb_failed;
	unsigned int alb_pushed;
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945
	/* SD_BALANCE_EXEC stats */
946 947 948
	unsigned int sbe_count;
	unsigned int sbe_balanced;
	unsigned int sbe_pushed;
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950
	/* SD_BALANCE_FORK stats */
951 952 953
	unsigned int sbf_count;
	unsigned int sbf_balanced;
	unsigned int sbf_pushed;
954

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	/* try_to_wake_up() stats */
956 957 958
	unsigned int ttwu_wake_remote;
	unsigned int ttwu_move_affine;
	unsigned int ttwu_move_balance;
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#endif
960 961 962
#ifdef CONFIG_SCHED_DEBUG
	char *name;
#endif
963

964
	unsigned int span_weight;
965 966 967 968 969 970 971 972 973 974 975
	/*
	 * 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)
	 *
	 * It is also be embedded into static data structures at build
	 * time. (See 'struct static_sched_domain' in kernel/sched.c)
	 */
	unsigned long span[0];
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};

978 979
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
980
	return to_cpumask(sd->span);
981 982
}

983
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
984
				    struct sched_domain_attr *dattr_new);
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/* 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);

990 991 992 993 994 995 996 997
/* Test a flag in parent sched domain */
static inline int test_sd_parent(struct sched_domain *sd, int flag)
{
	if (sd->parent && (sd->parent->flags & flag))
		return 1;

	return 0;
}
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999 1000 1001
unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);

1002
#else /* CONFIG_SMP */
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1004
struct sched_domain_attr;
1005

1006
static inline void
1007
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1008 1009
			struct sched_domain_attr *dattr_new)
{
1010
}
1011
#endif	/* !CONFIG_SMP */
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struct io_context;			/* See blkdev.h */


1017
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1018
extern void prefetch_stack(struct task_struct *t);
1019 1020 1021
#else
static inline void prefetch_stack(struct task_struct *t) { }
#endif
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struct audit_context;		/* See audit.c */
struct mempolicy;
1025
struct pipe_inode_info;
1026
struct uts_namespace;
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struct rq;
struct sched_domain;

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/*
 * wake flags
 */
#define WF_SYNC		0x01		/* waker goes to sleep after wakup */
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#define WF_FORK		0x02		/* child wakeup after fork */
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#define ENQUEUE_WAKEUP		1
#define ENQUEUE_WAKING		2
#define ENQUEUE_HEAD		4

#define DEQUEUE_SLEEP		1

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struct sched_class {
1044
	const struct sched_class *next;
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1046 1047
	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1048
	void (*yield_task) (struct rq *rq);
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	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
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1052
	struct task_struct * (*pick_next_task) (struct rq *rq);
1053
	void (*put_prev_task) (struct rq *rq, struct task_struct *p);
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1055
#ifdef CONFIG_SMP
1056 1057
	int  (*select_task_rq)(struct rq *rq, struct task_struct *p,
			       int sd_flag, int flags);
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1059 1060
	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
	void (*post_schedule) (struct rq *this_rq);
1061 1062
	void (*task_waking) (struct rq *this_rq, struct task_struct *task);
	void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1063

1064
	void (*set_cpus_allowed)(struct task_struct *p,
1065
				 const struct cpumask *newmask);
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1067 1068
	void (*rq_online)(struct rq *rq);
	void (*rq_offline)(struct rq *rq);
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#endif

	void (*set_curr_task) (struct rq *rq);
	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
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	void (*task_fork) (struct task_struct *p);
1074 1075 1076 1077 1078 1079 1080

	void (*switched_from) (struct rq *this_rq, struct task_struct *task,
			       int running);
	void (*switched_to) (struct rq *this_rq, struct task_struct *task,
			     int running);
	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
			     int oldprio, int running);
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1082 1083
	unsigned int (*get_rr_interval) (struct rq *rq,
					 struct task_struct *task);
1084

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#ifdef CONFIG_FAIR_GROUP_SCHED
1086
	void (*task_move_group) (struct task_struct *p, int on_rq);
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#endif
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};

struct load_weight {
	unsigned long weight, inv_weight;
};

1094
#ifdef CONFIG_SCHEDSTATS
1095
struct sched_statistics {
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	u64			wait_start;
1097
	u64			wait_max;
1098 1099
	u64			wait_count;
	u64			wait_sum;
1100 1101
	u64			iowait_count;
	u64			iowait_sum;
1102

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	u64			sleep_start;
	u64			sleep_max;
1105 1106 1107
	s64			sum_sleep_runtime;

	u64			block_start;
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	u64			block_max;
	u64			exec_max;
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	u64			slice_max;
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126

	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;
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
};
#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;
1145 1146
#endif

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#ifdef CONFIG_FAIR_GROUP_SCHED
	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
};
1155

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struct sched_rt_entity {
	struct list_head run_list;
1158
	unsigned long timeout;
1159
	unsigned int time_slice;
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	int nr_cpus_allowed;

1162
	struct sched_rt_entity *back;
1163
#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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};

1172 1173
struct rcu_node;

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enum perf_event_task_context {
	perf_invalid_context = -1,
	perf_hw_context = 0,
1177
	perf_sw_context,
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	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;
1185 1186
	unsigned int flags;	/* per process flags, defined below */
	unsigned int ptrace;
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1188
	int lock_depth;		/* BKL lock depth */
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1190 1191
#ifdef CONFIG_SMP
#ifdef __ARCH_WANT_UNLOCKED_CTXSW
1192 1193
	int oncpu;
#endif
1194
#endif
1195

1196
	int prio, static_prio, normal_prio;
1197
	unsigned int rt_priority;
1198
	const struct sched_class *sched_class;
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	struct sched_entity se;
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	struct sched_rt_entity rt;
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1202 1203 1204 1205 1206
#ifdef CONFIG_PREEMPT_NOTIFIERS
	/* list of struct preempt_notifier: */
	struct hlist_head preempt_notifiers;
#endif

1207 1208 1209 1210 1211 1212 1213 1214 1215
	/*
	 * fpu_counter contains the number of consecutive context switches
	 * that the FPU is used. If this is over a threshold, the lazy fpu
	 * saving becomes unlazy to save the trap. This is an unsigned char
	 * so that after 256 times the counter wraps and the behavior turns
	 * lazy again; this to deal with bursty apps that only use FPU for
	 * a short time
	 */
	unsigned char fpu_counter;
1216
#ifdef CONFIG_BLK_DEV_IO_TRACE
1217
	unsigned int btrace_seq;
1218
#endif
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1220
	unsigned int policy;
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	cpumask_t cpus_allowed;

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#ifdef CONFIG_PREEMPT_RCU
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	int rcu_read_lock_nesting;
1225 1226
	char rcu_read_unlock_special;
	struct list_head rcu_node_entry;
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#endif /* #ifdef CONFIG_PREEMPT_RCU */
#ifdef CONFIG_TREE_PREEMPT_RCU
	struct rcu_node *rcu_blocked_node;
1230
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
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1232
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
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	struct sched_info sched_info;
#endif

	struct list_head tasks;
1237
	struct plist_node pushable_tasks;
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	struct mm_struct *mm, *active_mm;
1240 1241 1242
#if defined(SPLIT_RSS_COUNTING)
	struct task_rss_stat	rss_stat;
#endif
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/* task state */
1244
	int exit_state;
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	int exit_code, exit_signal;
	int pdeath_signal;  /*  The signal sent when the parent dies  */
	/* ??? */
1248
	unsigned int personality;
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	unsigned did_exec:1;
1250 1251
	unsigned in_execve:1;	/* Tell the LSMs that the process is doing an
				 * execve */
1252 1253
	unsigned in_iowait:1;

1254 1255 1256 1257

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

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	pid_t pid;
	pid_t tgid;
1260

1261
#ifdef CONFIG_CC_STACKPROTECTOR
1262 1263
	/* Canary value for the -fstack-protector gcc feature */
	unsigned long stack_canary;
1264
#endif
1265

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	/* 
	 * pointers to (original) parent process, youngest child, younger sibling,
	 * older sibling, respectively.  (p->father can be replaced with 
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	 * p->real_parent->pid)
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	 */
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	struct task_struct *real_parent; /* real parent process */
	struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
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	/*
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	 * children/sibling forms the list of my natural children
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	 */
	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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	/* PID/PID hash table linkage. */
1289
	struct pid_link pids[PIDTYPE_MAX];
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	struct list_head thread_group;
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	struct completion *vfork_done;		/* for vfork() */
	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */

1296
	cputime_t utime, stime, utimescaled, stimescaled;
1297
	cputime_t gtime;
1298
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
1299
	cputime_t prev_utime, prev_stime;
1300
#endif
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	unsigned long nvcsw, nivcsw; /* context switch counts */
1302 1303
	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;

1307
	struct task_cputime cputime_expires;
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	struct list_head cpu_timers[3];

/* process credentials */
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	const struct cred __rcu *real_cred; /* objective and real subjective task
1312
					 * credentials (COW) */
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	const struct cred __rcu *cred;	/* effective (overridable) subjective task
1314
					 * credentials (COW) */
1315
	struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1316

1317 1318 1319
	char comm[TASK_COMM_LEN]; /* executable name excluding path
				     - access with [gs]et_task_comm (which lock
				       it with task_lock())
1320
				     - initialized normally by setup_new_exec */
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/* file system info */
	int link_count, total_link_count;
1323
#ifdef CONFIG_SYSVIPC
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/* ipc stuff */
	struct sysv_sem sysvsem;
1326
#endif
1327
#ifdef CONFIG_DETECT_HUNG_TASK
1328 1329 1330
/* 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;
1337
/* namespaces */
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	struct nsproxy *nsproxy;
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/* signal handlers */
	struct signal_struct *signal;
	struct sighand_struct *sighand;

	sigset_t blocked, real_blocked;
1344
	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
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	struct sigpending pending;

	unsigned long sas_ss_sp;
	size_t sas_ss_size;
	int (*notifier)(void *priv);
	void *notifier_data;
	sigset_t *notifier_mask;
	struct audit_context *audit_context;
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#ifdef CONFIG_AUDITSYSCALL
	uid_t loginuid;
1355
	unsigned int sessionid;
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#endif
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	seccomp_t seccomp;

/* Thread group tracking */
   	u32 parent_exec_id;
   	u32 self_exec_id;
1362 1363
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
 * mempolicy */
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	spinlock_t alloc_lock;

1366 1367 1368 1369 1370
#ifdef CONFIG_GENERIC_HARDIRQS
	/* IRQ handler threads */
	struct irqaction *irqaction;
#endif

1371
	/* Protection of the PI data structures: */
1372
	raw_spinlock_t pi_lock;
1373

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#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task */
	struct plist_head pi_waiters;
	/* Deadlock detection and priority inheritance handling */
	struct rt_mutex_waiter *pi_blocked_on;
#endif

1381 1382 1383 1384
#ifdef CONFIG_DEBUG_MUTEXES
	/* mutex deadlock detection */
	struct mutex_waiter *blocked_on;
#endif
1385 1386 1387 1388
#ifdef CONFIG_TRACE_IRQFLAGS
	unsigned int irq_events;
	unsigned long hardirq_enable_ip;
	unsigned long hardirq_disable_ip;
1389
	unsigned int hardirq_enable_event;
1390
	unsigned int hardirq_disable_event;
1391 1392
	int hardirqs_enabled;
	int hardirq_context;
1393 1394
	unsigned long softirq_disable_ip;
	unsigned long softirq_enable_ip;
1395
	unsigned int softirq_disable_event;
1396
	unsigned int softirq_enable_event;
1397
	int softirqs_enabled;
1398 1399
	int softirq_context;
#endif
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#ifdef CONFIG_LOCKDEP
1401
# define MAX_LOCK_DEPTH 48UL
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	u64 curr_chain_key;
	int lockdep_depth;
	unsigned int lockdep_recursion;
1405
	struct held_lock held_locks[MAX_LOCK_DEPTH];
1406
	gfp_t lockdep_reclaim_gfp;
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#endif
1408

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/* journalling filesystem info */
	void *journal_info;

1412
/* stacked block device info */
1413
	struct bio_list *bio_list;
1414

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/* 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.  */
1424
	struct task_io_accounting ioac;
1425
#if defined(CONFIG_TASK_XACCT)
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	u64 acct_rss_mem1;	/* accumulated rss usage */
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
1428
	cputime_t acct_timexpd;	/* stime + utime since last update */
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#endif
#ifdef CONFIG_CPUSETS
1431
	nodemask_t mems_allowed;	/* Protected by alloc_lock */
1432
	int mems_allowed_change_disable;
1433
	int cpuset_mem_spread_rotor;
1434
	int cpuset_slab_spread_rotor;
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#endif
1436
#ifdef CONFIG_CGROUPS
1437
	/* Control Group info protected by css_set_lock */
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	struct css_set __rcu *cgroups;
1439 1440
	/* cg_list protected by css_set_lock and tsk->alloc_lock */
	struct list_head cg_list;
1441
#endif
1442
#ifdef CONFIG_FUTEX
1443
	struct robust_list_head __user *robust_list;
1444 1445 1446
#ifdef CONFIG_COMPAT
	struct compat_robust_list_head __user *compat_robust_list;
#endif
1447 1448
	struct list_head pi_state_list;
	struct futex_pi_state *pi_state_cache;
1449
#endif
1450
#ifdef CONFIG_PERF_EVENTS
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	struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1452 1453
	struct mutex perf_event_mutex;
	struct list_head perf_event_list;
1454
#endif
1455
#ifdef CONFIG_NUMA
1456
	struct mempolicy *mempolicy;	/* Protected by alloc_lock */
1457
	short il_next;
1458
#endif
1459
	atomic_t fs_excl;	/* holding fs exclusive resources */
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	struct rcu_head rcu;
1461 1462 1463 1464 1465

	/*
	 * cache last used pipe for splice
	 */
	struct pipe_inode_info *splice_pipe;
1466 1467
#ifdef	CONFIG_TASK_DELAY_ACCT
	struct task_delay_info *delays;
1468 1469 1470
#endif
#ifdef CONFIG_FAULT_INJECTION
	int make_it_fail;
1471
#endif
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	struct prop_local_single dirties;
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#ifdef CONFIG_LATENCYTOP
	int latency_record_count;
	struct latency_record latency_record[LT_SAVECOUNT];
#endif
1477 1478 1479 1480 1481 1482
	/*
	 * 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;
1483 1484

	struct list_head	*scm_work_list;
1485
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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	/* Index of current stored address in ret_stack */
1487 1488 1489
	int curr_ret_stack;
	/* Stack of return addresses for return function tracing */
	struct ftrace_ret_stack	*ret_stack;
1490 1491
	/* time stamp for last schedule */
	unsigned long long ftrace_timestamp;
1492 1493 1494 1495 1496
	/*
	 * Number of functions that haven't been traced
	 * because of depth overrun.
	 */
	atomic_t trace_overrun;
1497 1498
	/* Pause for the tracing */
	atomic_t tracing_graph_pause;
1499
#endif
1500 1501 1502
#ifdef CONFIG_TRACING
	/* state flags for use by tracers */
	unsigned long trace;
1503 1504 1505
	/* bitmask of trace recursion */
	unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
1506 1507 1508 1509 1510 1511 1512 1513
#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
	struct memcg_batch_info {
		int do_batch;	/* incremented when batch uncharge started */
		struct mem_cgroup *memcg; /* target memcg of uncharge */
		unsigned long bytes; 		/* uncharged usage */
		unsigned long memsw_bytes; /* uncharged mem+swap usage */
	} memcg_batch;
#endif
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};

1516
/* Future-safe accessor for struct task_struct's cpus_allowed. */
1517
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1518

1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
/*
 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
 * values are inverted: lower p->prio value means higher priority.
 *
 * The MAX_USER_RT_PRIO value allows the actual maximum
 * RT priority to be separate from the value exported to
 * user-space.  This allows kernel threads to set their
 * priority to a value higher than any user task. Note:
 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
 */

#define MAX_USER_RT_PRIO	100
#define MAX_RT_PRIO		MAX_USER_RT_PRIO

#define MAX_PRIO		(MAX_RT_PRIO + 40)
#define DEFAULT_PRIO		(MAX_RT_PRIO + 20)

static inline int rt_prio(int prio)
{
	if (unlikely(prio < MAX_RT_PRIO))
		return 1;
	return 0;
}

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static inline int rt_task(struct task_struct *p)
1546 1547 1548 1549
{
	return rt_prio(p->prio);
}

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static inline struct pid *task_pid(struct task_struct *task)
1551 1552 1553 1554
{
	return task->pids[PIDTYPE_PID].pid;
}

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static inline struct pid *task_tgid(struct task_struct *task)
1556 1557 1558 1559
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}

1560 1561 1562 1563 1564
/*
 * 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.
 */
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static inline struct pid *task_pgrp(struct task_struct *task)
1566 1567 1568 1569
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}

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1570
static inline struct pid *task_session(struct task_struct *task)
1571 1572 1573 1574
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}

1575 1576 1577 1578 1579 1580 1581
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
1582 1583
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
1584 1585 1586 1587 1588 1589
 * 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
 */
1590 1591
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
			struct pid_namespace *ns);
1592

A
Alexey Dobriyan 已提交
1593
static inline pid_t task_pid_nr(struct task_struct *tsk)
1594 1595 1596 1597
{
	return tsk->pid;
}

1598 1599 1600 1601 1602
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);
}
1603 1604 1605

static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
1606
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1607 1608 1609
}


A
Alexey Dobriyan 已提交
1610
static inline pid_t task_tgid_nr(struct task_struct *tsk)
1611 1612 1613 1614
{
	return tsk->tgid;
}

1615
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1616 1617 1618 1619 1620 1621 1622

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


1623 1624
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
1625
{
1626
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1627 1628 1629 1630
}

static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
1631
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1632 1633 1634
}


1635 1636
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
1637
{
1638
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1639 1640 1641 1642
}

static inline pid_t task_session_vnr(struct task_struct *tsk)
{
1643
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1644 1645
}

1646 1647 1648 1649 1650
/* obsolete, do not use */
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
	return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
1651

L
Linus Torvalds 已提交
1652 1653 1654 1655 1656 1657 1658 1659
/**
 * 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.
 */
A
Alexey Dobriyan 已提交
1660
static inline int pid_alive(struct task_struct *p)
L
Linus Torvalds 已提交
1661
{
1662
	return p->pids[PIDTYPE_PID].pid != NULL;
L
Linus Torvalds 已提交
1663 1664
}

1665
/**
1666
 * is_global_init - check if a task structure is init
1667 1668 1669
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
1670
 */
A
Alexey Dobriyan 已提交
1671
static inline int is_global_init(struct task_struct *tsk)
1672 1673 1674
{
	return tsk->pid == 1;
}
1675 1676 1677 1678

/*
 * is_container_init:
 * check whether in the task is init in its own pid namespace.
1679
 */
1680
extern int is_container_init(struct task_struct *tsk);
1681

1682 1683
extern struct pid *cad_pid;

L
Linus Torvalds 已提交
1684 1685
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
1686

1687
extern void __put_task_struct(struct task_struct *t);
I
Ingo Molnar 已提交
1688 1689 1690 1691

static inline void put_task_struct(struct task_struct *t)
{
	if (atomic_dec_and_test(&t->usage))
1692
		__put_task_struct(t);
I
Ingo Molnar 已提交
1693
}
L
Linus Torvalds 已提交
1694

1695
extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1696
extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1697

L
Linus Torvalds 已提交
1698 1699 1700
/*
 * Per process flags
 */
1701
#define PF_KSOFTIRQD	0x00000001	/* I am ksoftirqd */
L
Linus Torvalds 已提交
1702 1703
#define PF_STARTING	0x00000002	/* being created */
#define PF_EXITING	0x00000004	/* getting shut down */
1704
#define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
1705
#define PF_VCPU		0x00000010	/* I'm a virtual CPU */
T
Tejun Heo 已提交
1706
#define PF_WQ_WORKER	0x00000020	/* I'm a workqueue worker */
L
Linus Torvalds 已提交
1707
#define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
1708
#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
L
Linus Torvalds 已提交
1709 1710 1711 1712 1713
#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 */
#define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
1714
#define PF_FREEZING	0x00004000	/* freeze in progress. do not account to load */
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Linus Torvalds 已提交
1715 1716 1717 1718
#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 */
H
Hugh Dickins 已提交
1719
#define PF_OOM_ORIGIN	0x00080000	/* Allocating much memory to others */
L
Linus Torvalds 已提交
1720
#define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
1721
#define PF_KTHREAD	0x00200000	/* I am a kernel thread */
J
Jens Axboe 已提交
1722 1723 1724 1725
#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 */
1726
#define PF_THREAD_BOUND	0x04000000	/* Thread bound to specific cpu */
1727
#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
1728
#define PF_MEMPOLICY	0x10000000	/* Non-default NUMA mempolicy */
1729
#define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
R
Rafael J. Wysocki 已提交
1730
#define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezeable */
1731
#define PF_FREEZER_NOSIG 0x80000000	/* Freezer won't send signals to it */
L
Linus Torvalds 已提交
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757

/*
 * 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)

P
Paul E. McKenney 已提交
1758
#ifdef CONFIG_PREEMPT_RCU
1759 1760 1761 1762 1763 1764 1765 1766

#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */

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
1767
#ifdef CONFIG_TREE_PREEMPT_RCU
1768
	p->rcu_blocked_node = NULL;
P
Paul E. McKenney 已提交
1769
#endif
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
	INIT_LIST_HEAD(&p->rcu_node_entry);
}

#else

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

#endif

L
Linus Torvalds 已提交
1781
#ifdef CONFIG_SMP
1782
extern int set_cpus_allowed_ptr(struct task_struct *p,
1783
				const struct cpumask *new_mask);
L
Linus Torvalds 已提交
1784
#else
1785
static inline int set_cpus_allowed_ptr(struct task_struct *p,
1786
				       const struct cpumask *new_mask)
L
Linus Torvalds 已提交
1787
{
1788
	if (!cpumask_test_cpu(0, new_mask))
L
Linus Torvalds 已提交
1789 1790 1791 1792
		return -EINVAL;
	return 0;
}
#endif
1793 1794

#ifndef CONFIG_CPUMASK_OFFSTACK
1795 1796 1797 1798
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
{
	return set_cpus_allowed_ptr(p, &new_mask);
}
1799
#endif
L
Linus Torvalds 已提交
1800

1801
/*
1802 1803 1804 1805 1806 1807
 * 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.
1808
 */
1809
extern unsigned long long notrace sched_clock(void);
1810 1811 1812 1813 1814 1815 1816
/*
 * See the comment in kernel/sched_clock.c
 */
extern u64 cpu_clock(int cpu);
extern u64 local_clock(void);
extern u64 sched_clock_cpu(int cpu);

1817

1818
extern void sched_clock_init(void);
1819

1820
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
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
1833 1834 1835 1836 1837 1838 1839 1840
/*
 * 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:
 */
extern int sched_clock_stable;

1841 1842 1843 1844 1845
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

1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
#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

1859
extern unsigned long long
1860
task_sched_runtime(struct task_struct *task);
1861
extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
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Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867 1868 1869

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

1870 1871
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1872

L
Linus Torvalds 已提交
1873
#ifdef CONFIG_HOTPLUG_CPU
1874
extern void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p);
L
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1875 1876 1877 1878 1879 1880
extern void idle_task_exit(void);
#else
static inline void idle_task_exit(void) {}
#endif

extern void sched_idle_next(void);
1881

1882 1883 1884 1885 1886 1887
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
extern void wake_up_idle_cpu(int cpu);
#else
static inline void wake_up_idle_cpu(int cpu) { }
#endif

1888
extern unsigned int sysctl_sched_latency;
1889
extern unsigned int sysctl_sched_min_granularity;
1890
extern unsigned int sysctl_sched_wakeup_granularity;
1891 1892
extern unsigned int sysctl_sched_shares_ratelimit;
extern unsigned int sysctl_sched_shares_thresh;
1893
extern unsigned int sysctl_sched_child_runs_first;
1894 1895 1896 1897 1898 1899 1900 1901 1902

enum sched_tunable_scaling {
	SCHED_TUNABLESCALING_NONE,
	SCHED_TUNABLESCALING_LOG,
	SCHED_TUNABLESCALING_LINEAR,
	SCHED_TUNABLESCALING_END,
};
extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;

1903
#ifdef CONFIG_SCHED_DEBUG
1904
extern unsigned int sysctl_sched_migration_cost;
1905
extern unsigned int sysctl_sched_nr_migrate;
1906
extern unsigned int sysctl_sched_time_avg;
1907
extern unsigned int sysctl_timer_migration;
1908

1909
int sched_proc_update_handler(struct ctl_table *table, int write,
1910
		void __user *buffer, size_t *length,
1911
		loff_t *ppos);
1912
#endif
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
#ifdef CONFIG_SCHED_DEBUG
static inline unsigned int get_sysctl_timer_migration(void)
{
	return sysctl_timer_migration;
}
#else
static inline unsigned int get_sysctl_timer_migration(void)
{
	return 1;
}
#endif
P
Peter Zijlstra 已提交
1924 1925
extern unsigned int sysctl_sched_rt_period;
extern int sysctl_sched_rt_runtime;
1926

1927
int sched_rt_handler(struct ctl_table *table, int write,
1928
		void __user *buffer, size_t *lenp,
1929 1930
		loff_t *ppos);

1931
extern unsigned int sysctl_sched_compat_yield;
1932

1933
#ifdef CONFIG_RT_MUTEXES
1934 1935 1936
extern int rt_mutex_getprio(struct task_struct *p);
extern void rt_mutex_setprio(struct task_struct *p, int prio);
extern void rt_mutex_adjust_pi(struct task_struct *p);
1937
#else
A
Alexey Dobriyan 已提交
1938
static inline int rt_mutex_getprio(struct task_struct *p)
1939 1940 1941
{
	return p->normal_prio;
}
1942
# define rt_mutex_adjust_pi(p)		do { } while (0)
1943 1944
#endif

1945 1946 1947 1948 1949
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
extern int task_nice(const struct task_struct *p);
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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Linus Torvalds 已提交
1950 1951
extern int idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1952 1953
extern int sched_setscheduler_nocheck(struct task_struct *, int,
				      struct sched_param *);
1954 1955 1956
extern struct task_struct *idle_task(int cpu);
extern struct task_struct *curr_task(int cpu);
extern void set_curr_task(int cpu, struct task_struct *p);
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Linus Torvalds 已提交
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984

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;

1985 1986 1987 1988 1989 1990 1991
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
1992 1993
 * find_task_by_vpid():
 *      finds a task by its virtual pid
1994
 *
1995
 * see also find_vpid() etc in include/linux/pid.h
1996 1997
 */

1998 1999 2000
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);
2001

2002
extern void __set_special_pids(struct pid *pid);
L
Linus Torvalds 已提交
2003 2004

/* per-UID process charging. */
2005
extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
L
Linus Torvalds 已提交
2006 2007 2008 2009 2010 2011
static inline struct user_struct *get_uid(struct user_struct *u)
{
	atomic_inc(&u->__count);
	return u;
}
extern void free_uid(struct user_struct *);
2012
extern void release_uids(struct user_namespace *ns);
L
Linus Torvalds 已提交
2013 2014 2015

#include <asm/current.h>

2016
extern void do_timer(unsigned long ticks);
L
Linus Torvalds 已提交
2017

2018 2019 2020 2021
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
extern void wake_up_new_task(struct task_struct *tsk,
				unsigned long clone_flags);
L
Linus Torvalds 已提交
2022 2023 2024 2025 2026
#ifdef CONFIG_SMP
 extern void kick_process(struct task_struct *tsk);
#else
 static inline void kick_process(struct task_struct *tsk) { }
#endif
2027 2028
extern void sched_fork(struct task_struct *p, int clone_flags);
extern void sched_dead(struct task_struct *p);
L
Linus Torvalds 已提交
2029 2030 2031

extern void proc_caches_init(void);
extern void flush_signals(struct task_struct *);
2032
extern void __flush_signals(struct task_struct *);
2033
extern void ignore_signals(struct task_struct *);
L
Linus Torvalds 已提交
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055
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;
}	

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 *);
2056 2057
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);
2058
extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2059 2060
extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
2061
extern int kill_proc_info(int, struct siginfo *, pid_t);
R
Roland McGrath 已提交
2062
extern int do_notify_parent(struct task_struct *, int);
2063
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
L
Linus Torvalds 已提交
2064 2065
extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
2066
extern int zap_other_threads(struct task_struct *p);
L
Linus Torvalds 已提交
2067 2068
extern struct sigqueue *sigqueue_alloc(void);
extern void sigqueue_free(struct sigqueue *);
2069
extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2070
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
L
Linus Torvalds 已提交
2071 2072
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);

2073 2074 2075 2076 2077
static inline int kill_cad_pid(int sig, int priv)
{
	return kill_pid(cad_pid, sig, priv);
}

L
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2078 2079 2080 2081 2082
/* 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)

2083 2084 2085
/*
 * True if we are on the alternate signal stack.
 */
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Linus Torvalds 已提交
2086 2087
static inline int on_sig_stack(unsigned long sp)
{
2088 2089 2090 2091 2092 2093 2094
#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);
}

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

/* mmdrop drops the mm and the page tables */
2109
extern void __mmdrop(struct mm_struct *);
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static inline void mmdrop(struct mm_struct * mm)
{
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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);
/* Remove the current tasks stale references to the old mm_struct */
extern void mm_release(struct task_struct *, struct mm_struct *);
2122 2123
/* Allocate a new mm structure and copy contents from tsk->mm */
extern struct mm_struct *dup_mm(struct task_struct *tsk);
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extern int copy_thread(unsigned long, unsigned long, unsigned long,
			struct task_struct *, struct pt_regs *);
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extern void flush_thread(void);
extern void exit_thread(void);

extern void exit_files(struct task_struct *);
2131
extern void __cleanup_sighand(struct sighand_struct *);
2132

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extern void exit_itimers(struct signal_struct *);
2134
extern void flush_itimer_signals(void);
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extern NORET_TYPE void do_group_exit(int);

extern void daemonize(const char *, ...);
extern int allow_signal(int);
extern int disallow_signal(int);

2142 2143 2144
extern int do_execve(const char *,
		     const char __user * const __user *,
		     const char __user * const __user *, struct pt_regs *);
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extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2146
struct task_struct *fork_idle(int);
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extern void set_task_comm(struct task_struct *tsk, char *from);
2149
extern char *get_task_comm(char *to, struct task_struct *tsk);
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#ifdef CONFIG_SMP
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extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
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#else
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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

2161 2162
#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 ; )

2167
extern bool current_is_single_threaded(void);
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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)

2179 2180
static inline int get_nr_threads(struct task_struct *tsk)
{
2181
	return tsk->signal->nr_threads;
2182 2183
}

2184 2185
/* de_thread depends on thread_group_leader not being a pid based check */
#define thread_group_leader(p)	(p == p->group_leader)
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2187 2188 2189 2190 2191 2192
/* 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.
 */
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static inline int has_group_leader_pid(struct task_struct *p)
2194 2195 2196 2197
{
	return p->pid == p->tgid;
}

2198 2199 2200 2201 2202 2203
static inline
int same_thread_group(struct task_struct *p1, struct task_struct *p2)
{
	return p1->tgid == p2->tgid;
}

2204
static inline struct task_struct *next_thread(const struct task_struct *p)
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Oleg Nesterov 已提交
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{
2206 2207
	return list_entry_rcu(p->thread_group.next,
			      struct task_struct, thread_group);
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}

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static inline int thread_group_empty(struct task_struct *p)
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{
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	return list_empty(&p->thread_group);
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}

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

2218 2219 2220 2221 2222
static inline int task_detached(struct task_struct *p)
{
	return p->exit_signal == -1;
}

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/*
2224
 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2225
 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2226 2227
 * pins the final release of task.io_context.  Also protects ->cpuset and
 * ->cgroup.subsys[].
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 *
 * 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);
}

2243
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2244 2245
							unsigned long *flags);

2246 2247 2248 2249 2250 2251 2252
#define lock_task_sighand(tsk, flags)					\
({	struct sighand_struct *__ss;					\
	__cond_lock(&(tsk)->sighand->siglock,				\
		    (__ss = __lock_task_sighand(tsk, flags)));		\
	__ss;								\
})									\

2253 2254 2255 2256 2257 2258
static inline void unlock_task_sighand(struct task_struct *tsk,
						unsigned long *flags)
{
	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
}

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#ifndef __HAVE_THREAD_FUNCTIONS

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#define task_thread_info(task)	((struct thread_info *)(task)->stack)
#define task_stack_page(task)	((task)->stack)
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2264 2265 2266 2267 2268 2269 2270 2271
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)
{
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	return (unsigned long *)(task_thread_info(p) + 1);
2273 2274
}

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#endif

2277 2278 2279 2280 2281 2282 2283
static inline int object_is_on_stack(void *obj)
{
	void *stack = task_stack_page(current);

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

2284 2285
extern void thread_info_cache_init(void);

2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298
#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);
}

2337 2338 2339 2340 2341
static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}

2342 2343 2344 2345 2346 2347
static inline int restart_syscall(void)
{
	set_tsk_thread_flag(current, TIF_SIGPENDING);
	return -ERESTARTNOINTR;
}

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static inline int signal_pending(struct task_struct *p)
{
	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
}
M
Matthew Wilcox 已提交
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2353 2354 2355 2356
static inline int __fatal_signal_pending(struct task_struct *p)
{
	return unlikely(sigismember(&p->pending.signal, SIGKILL));
}
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static inline int fatal_signal_pending(struct task_struct *p)
{
	return signal_pending(p) && __fatal_signal_pending(p);
}

2363 2364 2365 2366 2367 2368 2369 2370 2371 2372
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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static inline int need_resched(void)
{
2375
	return unlikely(test_thread_flag(TIF_NEED_RESCHED));
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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.
 */
2385
extern int _cond_resched(void);
2386

2387 2388 2389 2390
#define cond_resched() ({			\
	__might_sleep(__FILE__, __LINE__, 0);	\
	_cond_resched();			\
})
2391

2392 2393
extern int __cond_resched_lock(spinlock_t *lock);

2394 2395
#ifdef CONFIG_PREEMPT
#define PREEMPT_LOCK_OFFSET	PREEMPT_OFFSET
2396
#else
2397
#define PREEMPT_LOCK_OFFSET	0
2398
#endif
2399

2400
#define cond_resched_lock(lock) ({				\
2401
	__might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);	\
2402 2403 2404 2405 2406
	__cond_resched_lock(lock);				\
})

extern int __cond_resched_softirq(void);

2407 2408 2409
#define cond_resched_softirq() ({					\
	__might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);	\
	__cond_resched_softirq();					\
2410
})
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Linus Torvalds 已提交
2411 2412 2413

/*
 * Does a critical section need to be broken due to another
N
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2414 2415
 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
L
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2416
 */
N
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2417
static inline int spin_needbreak(spinlock_t *lock)
L
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2418
{
N
Nick Piggin 已提交
2419 2420 2421
#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
L
Linus Torvalds 已提交
2422
	return 0;
N
Nick Piggin 已提交
2423
#endif
L
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2424 2425
}

2426 2427 2428
/*
 * Thread group CPU time accounting.
 */
2429
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2430
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2431

2432
static inline void thread_group_cputime_init(struct signal_struct *sig)
2433
{
2434
	spin_lock_init(&sig->cputimer.lock);
2435 2436
}

R
Roland McGrath 已提交
2437 2438 2439 2440 2441 2442 2443
/*
 * 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);

extern void signal_wake_up(struct task_struct *t, int resume_stopped);

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

static inline unsigned int task_cpu(const struct task_struct *p)
{
A
Al Viro 已提交
2455
	return task_thread_info(p)->cpu;
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2456 2457
}

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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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2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472

#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 */

2473 2474
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2475

L
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2476 2477
extern void normalize_rt_tasks(void);

D
Dhaval Giani 已提交
2478
#ifdef CONFIG_CGROUP_SCHED
2479

2480
extern struct task_group init_task_group;
2481

2482
extern struct task_group *sched_create_group(struct task_group *parent);
2483
extern void sched_destroy_group(struct task_group *tg);
2484
extern void sched_move_task(struct task_struct *tsk);
2485
#ifdef CONFIG_FAIR_GROUP_SCHED
2486
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2487
extern unsigned long sched_group_shares(struct task_group *tg);
2488 2489
#endif
#ifdef CONFIG_RT_GROUP_SCHED
P
Peter Zijlstra 已提交
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extern int sched_group_set_rt_runtime(struct task_group *tg,
				      long rt_runtime_us);
extern long sched_group_rt_runtime(struct task_group *tg);
2493 2494 2495
extern int sched_group_set_rt_period(struct task_group *tg,
				      long rt_period_us);
extern long sched_group_rt_period(struct task_group *tg);
2496
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2497
#endif
2498 2499
#endif

2500 2501 2502
extern int task_can_switch_user(struct user_struct *up,
					struct task_struct *tsk);

2503 2504 2505
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
2506
	tsk->ioac.rchar += amt;
2507 2508 2509 2510
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
2511
	tsk->ioac.wchar += amt;
2512 2513 2514 2515
}

static inline void inc_syscr(struct task_struct *tsk)
{
2516
	tsk->ioac.syscr++;
2517 2518 2519 2520
}

static inline void inc_syscw(struct task_struct *tsk)
{
2521
	tsk->ioac.syscw++;
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
}
#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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2541 2542 2543 2544
#ifndef TASK_SIZE_OF
#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

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2545 2546 2547 2548 2549 2550 2551
/*
 * Call the function if the target task is executing on a CPU right now:
 */
extern void task_oncpu_function_call(struct task_struct *p,
				     void (*func) (void *info), void *info);


2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564
#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 */

2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
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 /* __KERNEL__ */

#endif