4 #include <uapi/linux/sched.h>
6 #include <linux/sched/prio.h>
8 #include <asm/param.h> /* for HZ */
10 #include <linux/capability.h>
11 #include <linux/threads.h>
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/timex.h>
15 #include <linux/jiffies.h>
16 #include <linux/mutex.h>
17 #include <linux/plist.h>
18 #include <linux/rbtree.h>
19 #include <linux/thread_info.h>
20 #include <linux/cpumask.h>
21 #include <linux/errno.h>
22 #include <linux/nodemask.h>
23 #include <linux/mm_types.h>
24 #include <linux/preempt.h>
27 #include <asm/ptrace.h>
29 #include <linux/smp.h>
30 #include <linux/sem.h>
31 #include <linux/shm.h>
32 #include <linux/signal.h>
33 #include <linux/compiler.h>
34 #include <linux/completion.h>
35 #include <linux/signal_types.h>
36 #include <linux/pid.h>
37 #include <linux/percpu.h>
38 #include <linux/topology.h>
39 #include <linux/seccomp.h>
40 #include <linux/rcupdate.h>
41 #include <linux/rculist.h>
42 #include <linux/rtmutex.h>
44 #include <linux/time.h>
45 #include <linux/param.h>
46 #include <linux/resource.h>
47 #include <linux/timer.h>
48 #include <linux/hrtimer.h>
49 #include <linux/kcov.h>
50 #include <linux/task_io_accounting.h>
51 #include <linux/latencytop.h>
52 #include <linux/cred.h>
53 #include <linux/llist.h>
54 #include <linux/uidgid.h>
55 #include <linux/gfp.h>
56 #include <linux/topology.h>
57 #include <linux/magic.h>
58 #include <linux/cgroup-defs.h>
60 #include <asm/processor.h>
65 struct futex_pi_state;
66 struct robust_list_head;
69 struct perf_event_context;
74 extern unsigned long total_forks;
75 extern int nr_threads;
76 DECLARE_PER_CPU(unsigned long, process_counts);
77 extern int nr_processes(void);
78 extern unsigned long nr_running(void);
79 extern bool single_task_running(void);
80 extern unsigned long nr_iowait(void);
81 extern unsigned long nr_iowait_cpu(int cpu);
82 extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
84 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
85 extern void cpu_load_update_nohz_start(void);
86 extern void cpu_load_update_nohz_stop(void);
88 static inline void cpu_load_update_nohz_start(void) { }
89 static inline void cpu_load_update_nohz_stop(void) { }
92 extern void dump_cpu_task(int cpu);
97 #ifdef CONFIG_SCHED_DEBUG
98 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
99 extern void proc_sched_set_task(struct task_struct *p);
103 * Task state bitmask. NOTE! These bits are also
104 * encoded in fs/proc/array.c: get_task_state().
106 * We have two separate sets of flags: task->state
107 * is about runnability, while task->exit_state are
108 * about the task exiting. Confusing, but this way
109 * modifying one set can't modify the other one by
112 #define TASK_RUNNING 0
113 #define TASK_INTERRUPTIBLE 1
114 #define TASK_UNINTERRUPTIBLE 2
115 #define __TASK_STOPPED 4
116 #define __TASK_TRACED 8
117 /* in tsk->exit_state */
119 #define EXIT_ZOMBIE 32
120 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
121 /* in tsk->state again */
123 #define TASK_WAKEKILL 128
124 #define TASK_WAKING 256
125 #define TASK_PARKED 512
126 #define TASK_NOLOAD 1024
127 #define TASK_NEW 2048
128 #define TASK_STATE_MAX 4096
130 #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn"
132 /* Convenience macros for the sake of set_current_state */
133 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
134 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
135 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
137 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
139 /* Convenience macros for the sake of wake_up */
140 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
141 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
143 /* get_task_state() */
144 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
145 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
146 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
148 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
149 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
150 #define task_is_stopped_or_traced(task) \
151 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
152 #define task_contributes_to_load(task) \
153 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
154 (task->flags & PF_FROZEN) == 0 && \
155 (task->state & TASK_NOLOAD) == 0)
157 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
159 #define __set_current_state(state_value) \
161 current->task_state_change = _THIS_IP_; \
162 current->state = (state_value); \
164 #define set_current_state(state_value) \
166 current->task_state_change = _THIS_IP_; \
167 smp_store_mb(current->state, (state_value)); \
172 * set_current_state() includes a barrier so that the write of current->state
173 * is correctly serialised wrt the caller's subsequent test of whether to
177 * set_current_state(TASK_UNINTERRUPTIBLE);
183 * __set_current_state(TASK_RUNNING);
185 * If the caller does not need such serialisation (because, for instance, the
186 * condition test and condition change and wakeup are under the same lock) then
187 * use __set_current_state().
189 * The above is typically ordered against the wakeup, which does:
191 * need_sleep = false;
192 * wake_up_state(p, TASK_UNINTERRUPTIBLE);
194 * Where wake_up_state() (and all other wakeup primitives) imply enough
195 * barriers to order the store of the variable against wakeup.
197 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
198 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
199 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
201 * This is obviously fine, since they both store the exact same value.
203 * Also see the comments of try_to_wake_up().
205 #define __set_current_state(state_value) \
206 do { current->state = (state_value); } while (0)
207 #define set_current_state(state_value) \
208 smp_store_mb(current->state, (state_value))
212 /* Task command name length */
213 #define TASK_COMM_LEN 16
215 #include <linux/spinlock.h>
218 * This serializes "schedule()" and also protects
219 * the run-queue from deletions/modifications (but
220 * _adding_ to the beginning of the run-queue has
223 extern rwlock_t tasklist_lock;
224 extern spinlock_t mmlist_lock;
228 #ifdef CONFIG_PROVE_RCU
229 extern int lockdep_tasklist_lock_is_held(void);
230 #endif /* #ifdef CONFIG_PROVE_RCU */
232 extern void sched_init(void);
233 extern void sched_init_smp(void);
234 extern asmlinkage void schedule_tail(struct task_struct *prev);
235 extern void init_idle(struct task_struct *idle, int cpu);
236 extern void init_idle_bootup_task(struct task_struct *idle);
238 extern cpumask_var_t cpu_isolated_map;
240 extern int runqueue_is_locked(int cpu);
242 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
243 extern void nohz_balance_enter_idle(int cpu);
244 extern void set_cpu_sd_state_idle(void);
245 extern int get_nohz_timer_target(void);
247 static inline void nohz_balance_enter_idle(int cpu) { }
248 static inline void set_cpu_sd_state_idle(void) { }
252 * Only dump TASK_* tasks. (0 for all tasks)
254 extern void show_state_filter(unsigned long state_filter);
256 static inline void show_state(void)
258 show_state_filter(0);
261 extern void show_regs(struct pt_regs *);
264 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
265 * task), SP is the stack pointer of the first frame that should be shown in the back
266 * trace (or NULL if the entire call-chain of the task should be shown).
268 extern void show_stack(struct task_struct *task, unsigned long *sp);
270 extern void cpu_init (void);
271 extern void trap_init(void);
272 extern void update_process_times(int user);
273 extern void scheduler_tick(void);
274 extern int sched_cpu_starting(unsigned int cpu);
275 extern int sched_cpu_activate(unsigned int cpu);
276 extern int sched_cpu_deactivate(unsigned int cpu);
278 #ifdef CONFIG_HOTPLUG_CPU
279 extern int sched_cpu_dying(unsigned int cpu);
281 # define sched_cpu_dying NULL
284 extern void sched_show_task(struct task_struct *p);
286 #ifdef CONFIG_LOCKUP_DETECTOR
287 extern void touch_softlockup_watchdog_sched(void);
288 extern void touch_softlockup_watchdog(void);
289 extern void touch_softlockup_watchdog_sync(void);
290 extern void touch_all_softlockup_watchdogs(void);
291 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
293 size_t *lenp, loff_t *ppos);
294 extern unsigned int softlockup_panic;
295 extern unsigned int hardlockup_panic;
296 void lockup_detector_init(void);
298 static inline void touch_softlockup_watchdog_sched(void)
301 static inline void touch_softlockup_watchdog(void)
304 static inline void touch_softlockup_watchdog_sync(void)
307 static inline void touch_all_softlockup_watchdogs(void)
310 static inline void lockup_detector_init(void)
315 #ifdef CONFIG_DETECT_HUNG_TASK
316 void reset_hung_task_detector(void);
318 static inline void reset_hung_task_detector(void)
323 /* Attach to any functions which should be ignored in wchan output. */
324 #define __sched __attribute__((__section__(".sched.text")))
326 /* Linker adds these: start and end of __sched functions */
327 extern char __sched_text_start[], __sched_text_end[];
329 /* Is this address in the __sched functions? */
330 extern int in_sched_functions(unsigned long addr);
332 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
333 extern signed long schedule_timeout(signed long timeout);
334 extern signed long schedule_timeout_interruptible(signed long timeout);
335 extern signed long schedule_timeout_killable(signed long timeout);
336 extern signed long schedule_timeout_uninterruptible(signed long timeout);
337 extern signed long schedule_timeout_idle(signed long timeout);
338 asmlinkage void schedule(void);
339 extern void schedule_preempt_disabled(void);
341 extern int __must_check io_schedule_prepare(void);
342 extern void io_schedule_finish(int token);
343 extern long io_schedule_timeout(long timeout);
344 extern void io_schedule(void);
346 void __noreturn do_task_dead(void);
349 struct user_namespace;
352 extern void arch_pick_mmap_layout(struct mm_struct *mm);
354 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
355 unsigned long, unsigned long);
357 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
358 unsigned long len, unsigned long pgoff,
359 unsigned long flags);
361 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
364 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
365 #define SUID_DUMP_USER 1 /* Dump as user of process */
366 #define SUID_DUMP_ROOT 2 /* Dump as root */
370 /* for SUID_DUMP_* above */
371 #define MMF_DUMPABLE_BITS 2
372 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
374 extern void set_dumpable(struct mm_struct *mm, int value);
376 * This returns the actual value of the suid_dumpable flag. For things
377 * that are using this for checking for privilege transitions, it must
378 * test against SUID_DUMP_USER rather than treating it as a boolean
381 static inline int __get_dumpable(unsigned long mm_flags)
383 return mm_flags & MMF_DUMPABLE_MASK;
386 static inline int get_dumpable(struct mm_struct *mm)
388 return __get_dumpable(mm->flags);
391 /* coredump filter bits */
392 #define MMF_DUMP_ANON_PRIVATE 2
393 #define MMF_DUMP_ANON_SHARED 3
394 #define MMF_DUMP_MAPPED_PRIVATE 4
395 #define MMF_DUMP_MAPPED_SHARED 5
396 #define MMF_DUMP_ELF_HEADERS 6
397 #define MMF_DUMP_HUGETLB_PRIVATE 7
398 #define MMF_DUMP_HUGETLB_SHARED 8
399 #define MMF_DUMP_DAX_PRIVATE 9
400 #define MMF_DUMP_DAX_SHARED 10
402 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
403 #define MMF_DUMP_FILTER_BITS 9
404 #define MMF_DUMP_FILTER_MASK \
405 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
406 #define MMF_DUMP_FILTER_DEFAULT \
407 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
408 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
410 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
411 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
413 # define MMF_DUMP_MASK_DEFAULT_ELF 0
415 /* leave room for more dump flags */
416 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
417 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
419 * This one-shot flag is dropped due to necessity of changing exe once again
422 //#define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
424 #define MMF_HAS_UPROBES 19 /* has uprobes */
425 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
426 #define MMF_OOM_SKIP 21 /* mm is of no interest for the OOM killer */
427 #define MMF_UNSTABLE 22 /* mm is unstable for copy_from_user */
428 #define MMF_HUGE_ZERO_PAGE 23 /* mm has ever used the global huge zero page */
430 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
432 struct sighand_struct {
434 struct k_sigaction action[_NSIG];
436 wait_queue_head_t signalfd_wqh;
439 struct pacct_struct {
442 unsigned long ac_mem;
443 u64 ac_utime, ac_stime;
444 unsigned long ac_minflt, ac_majflt;
453 * struct prev_cputime - snaphsot of system and user cputime
454 * @utime: time spent in user mode
455 * @stime: time spent in system mode
456 * @lock: protects the above two fields
458 * Stores previous user/system time values such that we can guarantee
461 struct prev_cputime {
462 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
469 static inline void prev_cputime_init(struct prev_cputime *prev)
471 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
472 prev->utime = prev->stime = 0;
473 raw_spin_lock_init(&prev->lock);
478 * struct task_cputime - collected CPU time counts
479 * @utime: time spent in user mode, in nanoseconds
480 * @stime: time spent in kernel mode, in nanoseconds
481 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
483 * This structure groups together three kinds of CPU time that are tracked for
484 * threads and thread groups. Most things considering CPU time want to group
485 * these counts together and treat all three of them in parallel.
487 struct task_cputime {
490 unsigned long long sum_exec_runtime;
493 /* Alternate field names when used to cache expirations. */
494 #define virt_exp utime
495 #define prof_exp stime
496 #define sched_exp sum_exec_runtime
499 * This is the atomic variant of task_cputime, which can be used for
500 * storing and updating task_cputime statistics without locking.
502 struct task_cputime_atomic {
505 atomic64_t sum_exec_runtime;
508 #define INIT_CPUTIME_ATOMIC \
509 (struct task_cputime_atomic) { \
510 .utime = ATOMIC64_INIT(0), \
511 .stime = ATOMIC64_INIT(0), \
512 .sum_exec_runtime = ATOMIC64_INIT(0), \
515 #define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
518 * Disable preemption until the scheduler is running -- use an unconditional
519 * value so that it also works on !PREEMPT_COUNT kernels.
521 * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count().
523 #define INIT_PREEMPT_COUNT PREEMPT_OFFSET
526 * Initial preempt_count value; reflects the preempt_count schedule invariant
527 * which states that during context switches:
529 * preempt_count() == 2*PREEMPT_DISABLE_OFFSET
531 * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.
532 * Note: See finish_task_switch().
534 #define FORK_PREEMPT_COUNT (2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
537 * struct thread_group_cputimer - thread group interval timer counts
538 * @cputime_atomic: atomic thread group interval timers.
539 * @running: true when there are timers running and
540 * @cputime_atomic receives updates.
541 * @checking_timer: true when a thread in the group is in the
542 * process of checking for thread group timers.
544 * This structure contains the version of task_cputime, above, that is
545 * used for thread group CPU timer calculations.
547 struct thread_group_cputimer {
548 struct task_cputime_atomic cputime_atomic;
553 #include <linux/rwsem.h>
557 * NOTE! "signal_struct" does not have its own
558 * locking, because a shared signal_struct always
559 * implies a shared sighand_struct, so locking
560 * sighand_struct is always a proper superset of
561 * the locking of signal_struct.
563 struct signal_struct {
567 struct list_head thread_head;
569 wait_queue_head_t wait_chldexit; /* for wait4() */
571 /* current thread group signal load-balancing target: */
572 struct task_struct *curr_target;
574 /* shared signal handling: */
575 struct sigpending shared_pending;
577 /* thread group exit support */
580 * - notify group_exit_task when ->count is equal to notify_count
581 * - everyone except group_exit_task is stopped during signal delivery
582 * of fatal signals, group_exit_task processes the signal.
585 struct task_struct *group_exit_task;
587 /* thread group stop support, overloads group_exit_code too */
588 int group_stop_count;
589 unsigned int flags; /* see SIGNAL_* flags below */
592 * PR_SET_CHILD_SUBREAPER marks a process, like a service
593 * manager, to re-parent orphan (double-forking) child processes
594 * to this process instead of 'init'. The service manager is
595 * able to receive SIGCHLD signals and is able to investigate
596 * the process until it calls wait(). All children of this
597 * process will inherit a flag if they should look for a
598 * child_subreaper process at exit.
600 unsigned int is_child_subreaper:1;
601 unsigned int has_child_subreaper:1;
603 #ifdef CONFIG_POSIX_TIMERS
605 /* POSIX.1b Interval Timers */
607 struct list_head posix_timers;
609 /* ITIMER_REAL timer for the process */
610 struct hrtimer real_timer;
611 ktime_t it_real_incr;
614 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
615 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
616 * values are defined to 0 and 1 respectively
618 struct cpu_itimer it[2];
621 * Thread group totals for process CPU timers.
622 * See thread_group_cputimer(), et al, for details.
624 struct thread_group_cputimer cputimer;
626 /* Earliest-expiration cache. */
627 struct task_cputime cputime_expires;
629 struct list_head cpu_timers[3];
633 struct pid *leader_pid;
635 #ifdef CONFIG_NO_HZ_FULL
636 atomic_t tick_dep_mask;
639 struct pid *tty_old_pgrp;
641 /* boolean value for session group leader */
644 struct tty_struct *tty; /* NULL if no tty */
646 #ifdef CONFIG_SCHED_AUTOGROUP
647 struct autogroup *autogroup;
650 * Cumulative resource counters for dead threads in the group,
651 * and for reaped dead child processes forked by this group.
652 * Live threads maintain their own counters and add to these
653 * in __exit_signal, except for the group leader.
655 seqlock_t stats_lock;
656 u64 utime, stime, cutime, cstime;
659 struct prev_cputime prev_cputime;
660 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
661 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
662 unsigned long inblock, oublock, cinblock, coublock;
663 unsigned long maxrss, cmaxrss;
664 struct task_io_accounting ioac;
667 * Cumulative ns of schedule CPU time fo dead threads in the
668 * group, not including a zombie group leader, (This only differs
669 * from jiffies_to_ns(utime + stime) if sched_clock uses something
670 * other than jiffies.)
672 unsigned long long sum_sched_runtime;
675 * We don't bother to synchronize most readers of this at all,
676 * because there is no reader checking a limit that actually needs
677 * to get both rlim_cur and rlim_max atomically, and either one
678 * alone is a single word that can safely be read normally.
679 * getrlimit/setrlimit use task_lock(current->group_leader) to
680 * protect this instead of the siglock, because they really
681 * have no need to disable irqs.
683 struct rlimit rlim[RLIM_NLIMITS];
685 #ifdef CONFIG_BSD_PROCESS_ACCT
686 struct pacct_struct pacct; /* per-process accounting information */
688 #ifdef CONFIG_TASKSTATS
689 struct taskstats *stats;
693 struct tty_audit_buf *tty_audit_buf;
697 * Thread is the potential origin of an oom condition; kill first on
700 bool oom_flag_origin;
701 short oom_score_adj; /* OOM kill score adjustment */
702 short oom_score_adj_min; /* OOM kill score adjustment min value.
703 * Only settable by CAP_SYS_RESOURCE. */
704 struct mm_struct *oom_mm; /* recorded mm when the thread group got
705 * killed by the oom killer */
707 struct mutex cred_guard_mutex; /* guard against foreign influences on
708 * credential calculations
709 * (notably. ptrace) */
713 * Bits in flags field of signal_struct.
715 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
716 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
717 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
718 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
720 * Pending notifications to parent.
722 #define SIGNAL_CLD_STOPPED 0x00000010
723 #define SIGNAL_CLD_CONTINUED 0x00000020
724 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
726 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
728 #define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \
729 SIGNAL_STOP_CONTINUED)
731 static inline void signal_set_stop_flags(struct signal_struct *sig,
734 WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));
735 sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
738 /* If true, all threads except ->group_exit_task have pending SIGKILL */
739 static inline int signal_group_exit(const struct signal_struct *sig)
741 return (sig->flags & SIGNAL_GROUP_EXIT) ||
742 (sig->group_exit_task != NULL);
746 * Some day this will be a full-fledged user tracking system..
749 atomic_t __count; /* reference count */
750 atomic_t processes; /* How many processes does this user have? */
751 atomic_t sigpending; /* How many pending signals does this user have? */
752 #ifdef CONFIG_FANOTIFY
753 atomic_t fanotify_listeners;
756 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
758 #ifdef CONFIG_POSIX_MQUEUE
759 /* protected by mq_lock */
760 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
762 unsigned long locked_shm; /* How many pages of mlocked shm ? */
763 unsigned long unix_inflight; /* How many files in flight in unix sockets */
764 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
767 struct key *uid_keyring; /* UID specific keyring */
768 struct key *session_keyring; /* UID's default session keyring */
771 /* Hash table maintenance information */
772 struct hlist_node uidhash_node;
775 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
776 atomic_long_t locked_vm;
780 extern int uids_sysfs_init(void);
782 extern struct user_struct *find_user(kuid_t);
784 extern struct user_struct root_user;
785 #define INIT_USER (&root_user)
788 struct backing_dev_info;
789 struct reclaim_state;
791 #ifdef CONFIG_SCHED_INFO
793 /* cumulative counters */
794 unsigned long pcount; /* # of times run on this cpu */
795 unsigned long long run_delay; /* time spent waiting on a runqueue */
798 unsigned long long last_arrival,/* when we last ran on a cpu */
799 last_queued; /* when we were last queued to run */
801 #endif /* CONFIG_SCHED_INFO */
803 struct task_delay_info;
805 static inline int sched_info_on(void)
807 #ifdef CONFIG_SCHEDSTATS
809 #elif defined(CONFIG_TASK_DELAY_ACCT)
810 extern int delayacct_on;
817 #ifdef CONFIG_SCHEDSTATS
818 void force_schedstat_enabled(void);
822 * Integer metrics need fixed point arithmetic, e.g., sched/fair
823 * has a few: load, load_avg, util_avg, freq, and capacity.
825 * We define a basic fixed point arithmetic range, and then formalize
826 * all these metrics based on that basic range.
828 # define SCHED_FIXEDPOINT_SHIFT 10
829 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
831 struct io_context; /* See blkdev.h */
834 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
835 extern void prefetch_stack(struct task_struct *t);
837 static inline void prefetch_stack(struct task_struct *t) { }
840 struct audit_context; /* See audit.c */
842 struct pipe_inode_info;
843 struct uts_namespace;
846 unsigned long weight;
851 * The load_avg/util_avg accumulates an infinite geometric series
852 * (see __update_load_avg() in kernel/sched/fair.c).
854 * [load_avg definition]
856 * load_avg = runnable% * scale_load_down(load)
858 * where runnable% is the time ratio that a sched_entity is runnable.
859 * For cfs_rq, it is the aggregated load_avg of all runnable and
860 * blocked sched_entities.
862 * load_avg may also take frequency scaling into account:
864 * load_avg = runnable% * scale_load_down(load) * freq%
866 * where freq% is the CPU frequency normalized to the highest frequency.
868 * [util_avg definition]
870 * util_avg = running% * SCHED_CAPACITY_SCALE
872 * where running% is the time ratio that a sched_entity is running on
873 * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
874 * and blocked sched_entities.
876 * util_avg may also factor frequency scaling and CPU capacity scaling:
878 * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
880 * where freq% is the same as above, and capacity% is the CPU capacity
881 * normalized to the greatest capacity (due to uarch differences, etc).
883 * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
884 * themselves are in the range of [0, 1]. To do fixed point arithmetics,
885 * we therefore scale them to as large a range as necessary. This is for
886 * example reflected by util_avg's SCHED_CAPACITY_SCALE.
890 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
891 * with the highest load (=88761), always runnable on a single cfs_rq,
892 * and should not overflow as the number already hits PID_MAX_LIMIT.
894 * For all other cases (including 32-bit kernels), struct load_weight's
895 * weight will overflow first before we do, because:
897 * Max(load_avg) <= Max(load.weight)
899 * Then it is the load_weight's responsibility to consider overflow
903 u64 last_update_time, load_sum;
904 u32 util_sum, period_contrib;
905 unsigned long load_avg, util_avg;
908 #ifdef CONFIG_SCHEDSTATS
909 struct sched_statistics {
919 s64 sum_sleep_runtime;
926 u64 nr_migrations_cold;
927 u64 nr_failed_migrations_affine;
928 u64 nr_failed_migrations_running;
929 u64 nr_failed_migrations_hot;
930 u64 nr_forced_migrations;
934 u64 nr_wakeups_migrate;
935 u64 nr_wakeups_local;
936 u64 nr_wakeups_remote;
937 u64 nr_wakeups_affine;
938 u64 nr_wakeups_affine_attempts;
939 u64 nr_wakeups_passive;
944 struct sched_entity {
945 struct load_weight load; /* for load-balancing */
946 struct rb_node run_node;
947 struct list_head group_node;
951 u64 sum_exec_runtime;
953 u64 prev_sum_exec_runtime;
957 #ifdef CONFIG_SCHEDSTATS
958 struct sched_statistics statistics;
961 #ifdef CONFIG_FAIR_GROUP_SCHED
963 struct sched_entity *parent;
964 /* rq on which this entity is (to be) queued: */
965 struct cfs_rq *cfs_rq;
966 /* rq "owned" by this entity/group: */
972 * Per entity load average tracking.
974 * Put into separate cache line so it does not
975 * collide with read-mostly values above.
977 struct sched_avg avg ____cacheline_aligned_in_smp;
981 struct sched_rt_entity {
982 struct list_head run_list;
983 unsigned long timeout;
984 unsigned long watchdog_stamp;
985 unsigned int time_slice;
986 unsigned short on_rq;
987 unsigned short on_list;
989 struct sched_rt_entity *back;
990 #ifdef CONFIG_RT_GROUP_SCHED
991 struct sched_rt_entity *parent;
992 /* rq on which this entity is (to be) queued: */
994 /* rq "owned" by this entity/group: */
999 struct sched_dl_entity {
1000 struct rb_node rb_node;
1003 * Original scheduling parameters. Copied here from sched_attr
1004 * during sched_setattr(), they will remain the same until
1005 * the next sched_setattr().
1007 u64 dl_runtime; /* maximum runtime for each instance */
1008 u64 dl_deadline; /* relative deadline of each instance */
1009 u64 dl_period; /* separation of two instances (period) */
1010 u64 dl_bw; /* dl_runtime / dl_deadline */
1013 * Actual scheduling parameters. Initialized with the values above,
1014 * they are continously updated during task execution. Note that
1015 * the remaining runtime could be < 0 in case we are in overrun.
1017 s64 runtime; /* remaining runtime for this instance */
1018 u64 deadline; /* absolute deadline for this instance */
1019 unsigned int flags; /* specifying the scheduler behaviour */
1024 * @dl_throttled tells if we exhausted the runtime. If so, the
1025 * task has to wait for a replenishment to be performed at the
1026 * next firing of dl_timer.
1028 * @dl_boosted tells if we are boosted due to DI. If so we are
1029 * outside bandwidth enforcement mechanism (but only until we
1030 * exit the critical section);
1032 * @dl_yielded tells if task gave up the cpu before consuming
1033 * all its available runtime during the last job.
1035 int dl_throttled, dl_boosted, dl_yielded;
1038 * Bandwidth enforcement timer. Each -deadline task has its
1039 * own bandwidth to be enforced, thus we need one timer per task.
1041 struct hrtimer dl_timer;
1049 u8 pad; /* Otherwise the compiler can store garbage here. */
1051 u32 s; /* Set of bits. */
1055 enum perf_event_task_context {
1056 perf_invalid_context = -1,
1057 perf_hw_context = 0,
1059 perf_nr_task_contexts,
1062 struct wake_q_node {
1063 struct wake_q_node *next;
1066 /* Track pages that require TLB flushes */
1067 struct tlbflush_unmap_batch {
1069 * Each bit set is a CPU that potentially has a TLB entry for one of
1070 * the PFNs being flushed. See set_tlb_ubc_flush_pending().
1072 struct cpumask cpumask;
1074 /* True if any bit in cpumask is set */
1075 bool flush_required;
1078 * If true then the PTE was dirty when unmapped. The entry must be
1079 * flushed before IO is initiated or a stale TLB entry potentially
1080 * allows an update without redirtying the page.
1085 struct task_struct {
1086 #ifdef CONFIG_THREAD_INFO_IN_TASK
1088 * For reasons of header soup (see current_thread_info()), this
1089 * must be the first element of task_struct.
1091 struct thread_info thread_info;
1093 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1096 unsigned int flags; /* per process flags, defined below */
1097 unsigned int ptrace;
1100 struct llist_node wake_entry;
1102 #ifdef CONFIG_THREAD_INFO_IN_TASK
1103 unsigned int cpu; /* current CPU */
1105 unsigned int wakee_flips;
1106 unsigned long wakee_flip_decay_ts;
1107 struct task_struct *last_wakee;
1113 int prio, static_prio, normal_prio;
1114 unsigned int rt_priority;
1115 const struct sched_class *sched_class;
1116 struct sched_entity se;
1117 struct sched_rt_entity rt;
1118 #ifdef CONFIG_CGROUP_SCHED
1119 struct task_group *sched_task_group;
1121 struct sched_dl_entity dl;
1123 #ifdef CONFIG_PREEMPT_NOTIFIERS
1124 /* list of struct preempt_notifier: */
1125 struct hlist_head preempt_notifiers;
1128 #ifdef CONFIG_BLK_DEV_IO_TRACE
1129 unsigned int btrace_seq;
1132 unsigned int policy;
1133 int nr_cpus_allowed;
1134 cpumask_t cpus_allowed;
1136 #ifdef CONFIG_PREEMPT_RCU
1137 int rcu_read_lock_nesting;
1138 union rcu_special rcu_read_unlock_special;
1139 struct list_head rcu_node_entry;
1140 struct rcu_node *rcu_blocked_node;
1141 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1142 #ifdef CONFIG_TASKS_RCU
1143 unsigned long rcu_tasks_nvcsw;
1144 bool rcu_tasks_holdout;
1145 struct list_head rcu_tasks_holdout_list;
1146 int rcu_tasks_idle_cpu;
1147 #endif /* #ifdef CONFIG_TASKS_RCU */
1149 #ifdef CONFIG_SCHED_INFO
1150 struct sched_info sched_info;
1153 struct list_head tasks;
1155 struct plist_node pushable_tasks;
1156 struct rb_node pushable_dl_tasks;
1159 struct mm_struct *mm, *active_mm;
1161 /* Per-thread vma caching: */
1162 struct vmacache vmacache;
1164 #if defined(SPLIT_RSS_COUNTING)
1165 struct task_rss_stat rss_stat;
1169 int exit_code, exit_signal;
1170 int pdeath_signal; /* The signal sent when the parent dies */
1171 unsigned long jobctl; /* JOBCTL_*, siglock protected */
1173 /* Used for emulating ABI behavior of previous Linux versions */
1174 unsigned int personality;
1176 /* scheduler bits, serialized by scheduler locks */
1177 unsigned sched_reset_on_fork:1;
1178 unsigned sched_contributes_to_load:1;
1179 unsigned sched_migrated:1;
1180 unsigned sched_remote_wakeup:1;
1181 unsigned :0; /* force alignment to the next boundary */
1183 /* unserialized, strictly 'current' */
1184 unsigned in_execve:1; /* bit to tell LSMs we're in execve */
1185 unsigned in_iowait:1;
1186 #if !defined(TIF_RESTORE_SIGMASK)
1187 unsigned restore_sigmask:1;
1190 unsigned memcg_may_oom:1;
1192 unsigned memcg_kmem_skip_account:1;
1195 #ifdef CONFIG_COMPAT_BRK
1196 unsigned brk_randomized:1;
1199 unsigned long atomic_flags; /* Flags needing atomic access. */
1201 struct restart_block restart_block;
1206 #ifdef CONFIG_CC_STACKPROTECTOR
1207 /* Canary value for the -fstack-protector gcc feature */
1208 unsigned long stack_canary;
1211 * pointers to (original) parent process, youngest child, younger sibling,
1212 * older sibling, respectively. (p->father can be replaced with
1213 * p->real_parent->pid)
1215 struct task_struct __rcu *real_parent; /* real parent process */
1216 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1218 * children/sibling forms the list of my natural children
1220 struct list_head children; /* list of my children */
1221 struct list_head sibling; /* linkage in my parent's children list */
1222 struct task_struct *group_leader; /* threadgroup leader */
1225 * ptraced is the list of tasks this task is using ptrace on.
1226 * This includes both natural children and PTRACE_ATTACH targets.
1227 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1229 struct list_head ptraced;
1230 struct list_head ptrace_entry;
1232 /* PID/PID hash table linkage. */
1233 struct pid_link pids[PIDTYPE_MAX];
1234 struct list_head thread_group;
1235 struct list_head thread_node;
1237 struct completion *vfork_done; /* for vfork() */
1238 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1239 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1242 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1243 u64 utimescaled, stimescaled;
1246 struct prev_cputime prev_cputime;
1247 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1248 seqcount_t vtime_seqcount;
1249 unsigned long long vtime_snap;
1251 /* Task is sleeping or running in a CPU with VTIME inactive */
1253 /* Task runs in userspace in a CPU with VTIME active */
1255 /* Task runs in kernelspace in a CPU with VTIME active */
1257 } vtime_snap_whence;
1260 #ifdef CONFIG_NO_HZ_FULL
1261 atomic_t tick_dep_mask;
1263 unsigned long nvcsw, nivcsw; /* context switch counts */
1264 u64 start_time; /* monotonic time in nsec */
1265 u64 real_start_time; /* boot based time in nsec */
1266 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1267 unsigned long min_flt, maj_flt;
1269 #ifdef CONFIG_POSIX_TIMERS
1270 struct task_cputime cputime_expires;
1271 struct list_head cpu_timers[3];
1274 /* process credentials */
1275 const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */
1276 const struct cred __rcu *real_cred; /* objective and real subjective task
1277 * credentials (COW) */
1278 const struct cred __rcu *cred; /* effective (overridable) subjective task
1279 * credentials (COW) */
1280 char comm[TASK_COMM_LEN]; /* executable name excluding path
1281 - access with [gs]et_task_comm (which lock
1282 it with task_lock())
1283 - initialized normally by setup_new_exec */
1284 /* file system info */
1285 struct nameidata *nameidata;
1286 #ifdef CONFIG_SYSVIPC
1288 struct sysv_sem sysvsem;
1289 struct sysv_shm sysvshm;
1291 #ifdef CONFIG_DETECT_HUNG_TASK
1292 /* hung task detection */
1293 unsigned long last_switch_count;
1295 /* filesystem information */
1296 struct fs_struct *fs;
1297 /* open file information */
1298 struct files_struct *files;
1300 struct nsproxy *nsproxy;
1301 /* signal handlers */
1302 struct signal_struct *signal;
1303 struct sighand_struct *sighand;
1305 sigset_t blocked, real_blocked;
1306 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1307 struct sigpending pending;
1309 unsigned long sas_ss_sp;
1311 unsigned sas_ss_flags;
1313 struct callback_head *task_works;
1315 struct audit_context *audit_context;
1316 #ifdef CONFIG_AUDITSYSCALL
1318 unsigned int sessionid;
1320 struct seccomp seccomp;
1322 /* Thread group tracking */
1325 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1327 spinlock_t alloc_lock;
1329 /* Protection of the PI data structures: */
1330 raw_spinlock_t pi_lock;
1332 struct wake_q_node wake_q;
1334 #ifdef CONFIG_RT_MUTEXES
1335 /* PI waiters blocked on a rt_mutex held by this task */
1336 struct rb_root pi_waiters;
1337 struct rb_node *pi_waiters_leftmost;
1338 /* Deadlock detection and priority inheritance handling */
1339 struct rt_mutex_waiter *pi_blocked_on;
1342 #ifdef CONFIG_DEBUG_MUTEXES
1343 /* mutex deadlock detection */
1344 struct mutex_waiter *blocked_on;
1346 #ifdef CONFIG_TRACE_IRQFLAGS
1347 unsigned int irq_events;
1348 unsigned long hardirq_enable_ip;
1349 unsigned long hardirq_disable_ip;
1350 unsigned int hardirq_enable_event;
1351 unsigned int hardirq_disable_event;
1352 int hardirqs_enabled;
1353 int hardirq_context;
1354 unsigned long softirq_disable_ip;
1355 unsigned long softirq_enable_ip;
1356 unsigned int softirq_disable_event;
1357 unsigned int softirq_enable_event;
1358 int softirqs_enabled;
1359 int softirq_context;
1361 #ifdef CONFIG_LOCKDEP
1362 # define MAX_LOCK_DEPTH 48UL
1365 unsigned int lockdep_recursion;
1366 struct held_lock held_locks[MAX_LOCK_DEPTH];
1367 gfp_t lockdep_reclaim_gfp;
1370 unsigned int in_ubsan;
1373 /* journalling filesystem info */
1376 /* stacked block device info */
1377 struct bio_list *bio_list;
1380 /* stack plugging */
1381 struct blk_plug *plug;
1385 struct reclaim_state *reclaim_state;
1387 struct backing_dev_info *backing_dev_info;
1389 struct io_context *io_context;
1391 unsigned long ptrace_message;
1392 siginfo_t *last_siginfo; /* For ptrace use. */
1393 struct task_io_accounting ioac;
1394 #if defined(CONFIG_TASK_XACCT)
1395 u64 acct_rss_mem1; /* accumulated rss usage */
1396 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1397 u64 acct_timexpd; /* stime + utime since last update */
1399 #ifdef CONFIG_CPUSETS
1400 nodemask_t mems_allowed; /* Protected by alloc_lock */
1401 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1402 int cpuset_mem_spread_rotor;
1403 int cpuset_slab_spread_rotor;
1405 #ifdef CONFIG_CGROUPS
1406 /* Control Group info protected by css_set_lock */
1407 struct css_set __rcu *cgroups;
1408 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1409 struct list_head cg_list;
1411 #ifdef CONFIG_INTEL_RDT_A
1415 struct robust_list_head __user *robust_list;
1416 #ifdef CONFIG_COMPAT
1417 struct compat_robust_list_head __user *compat_robust_list;
1419 struct list_head pi_state_list;
1420 struct futex_pi_state *pi_state_cache;
1422 #ifdef CONFIG_PERF_EVENTS
1423 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1424 struct mutex perf_event_mutex;
1425 struct list_head perf_event_list;
1427 #ifdef CONFIG_DEBUG_PREEMPT
1428 unsigned long preempt_disable_ip;
1431 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1433 short pref_node_fork;
1435 #ifdef CONFIG_NUMA_BALANCING
1437 unsigned int numa_scan_period;
1438 unsigned int numa_scan_period_max;
1439 int numa_preferred_nid;
1440 unsigned long numa_migrate_retry;
1441 u64 node_stamp; /* migration stamp */
1442 u64 last_task_numa_placement;
1443 u64 last_sum_exec_runtime;
1444 struct callback_head numa_work;
1446 struct list_head numa_entry;
1447 struct numa_group *numa_group;
1450 * numa_faults is an array split into four regions:
1451 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1452 * in this precise order.
1454 * faults_memory: Exponential decaying average of faults on a per-node
1455 * basis. Scheduling placement decisions are made based on these
1456 * counts. The values remain static for the duration of a PTE scan.
1457 * faults_cpu: Track the nodes the process was running on when a NUMA
1458 * hinting fault was incurred.
1459 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1460 * during the current scan window. When the scan completes, the counts
1461 * in faults_memory and faults_cpu decay and these values are copied.
1463 unsigned long *numa_faults;
1464 unsigned long total_numa_faults;
1467 * numa_faults_locality tracks if faults recorded during the last
1468 * scan window were remote/local or failed to migrate. The task scan
1469 * period is adapted based on the locality of the faults with different
1470 * weights depending on whether they were shared or private faults
1472 unsigned long numa_faults_locality[3];
1474 unsigned long numa_pages_migrated;
1475 #endif /* CONFIG_NUMA_BALANCING */
1477 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
1478 struct tlbflush_unmap_batch tlb_ubc;
1481 struct rcu_head rcu;
1484 * cache last used pipe for splice
1486 struct pipe_inode_info *splice_pipe;
1488 struct page_frag task_frag;
1490 #ifdef CONFIG_TASK_DELAY_ACCT
1491 struct task_delay_info *delays;
1494 #ifdef CONFIG_FAULT_INJECTION
1498 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1499 * balance_dirty_pages() for some dirty throttling pause
1502 int nr_dirtied_pause;
1503 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1505 #ifdef CONFIG_LATENCYTOP
1506 int latency_record_count;
1507 struct latency_record latency_record[LT_SAVECOUNT];
1510 * time slack values; these are used to round up poll() and
1511 * select() etc timeout values. These are in nanoseconds.
1514 u64 default_timer_slack_ns;
1517 unsigned int kasan_depth;
1519 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1520 /* Index of current stored address in ret_stack */
1522 /* Stack of return addresses for return function tracing */
1523 struct ftrace_ret_stack *ret_stack;
1524 /* time stamp for last schedule */
1525 unsigned long long ftrace_timestamp;
1527 * Number of functions that haven't been traced
1528 * because of depth overrun.
1530 atomic_t trace_overrun;
1531 /* Pause for the tracing */
1532 atomic_t tracing_graph_pause;
1534 #ifdef CONFIG_TRACING
1535 /* state flags for use by tracers */
1536 unsigned long trace;
1537 /* bitmask and counter of trace recursion */
1538 unsigned long trace_recursion;
1539 #endif /* CONFIG_TRACING */
1541 /* Coverage collection mode enabled for this task (0 if disabled). */
1542 enum kcov_mode kcov_mode;
1543 /* Size of the kcov_area. */
1545 /* Buffer for coverage collection. */
1547 /* kcov desciptor wired with this task or NULL. */
1551 struct mem_cgroup *memcg_in_oom;
1552 gfp_t memcg_oom_gfp_mask;
1553 int memcg_oom_order;
1555 /* number of pages to reclaim on returning to userland */
1556 unsigned int memcg_nr_pages_over_high;
1558 #ifdef CONFIG_UPROBES
1559 struct uprobe_task *utask;
1561 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1562 unsigned int sequential_io;
1563 unsigned int sequential_io_avg;
1565 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1566 unsigned long task_state_change;
1568 int pagefault_disabled;
1570 struct task_struct *oom_reaper_list;
1572 #ifdef CONFIG_VMAP_STACK
1573 struct vm_struct *stack_vm_area;
1575 #ifdef CONFIG_THREAD_INFO_IN_TASK
1576 /* A live task holds one reference. */
1577 atomic_t stack_refcount;
1579 /* CPU-specific state of this task */
1580 struct thread_struct thread;
1582 * WARNING: on x86, 'thread_struct' contains a variable-sized
1583 * structure. It *MUST* be at the end of 'task_struct'.
1585 * Do not put anything below here!
1589 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
1590 extern int arch_task_struct_size __read_mostly;
1592 # define arch_task_struct_size (sizeof(struct task_struct))
1595 #ifdef CONFIG_VMAP_STACK
1596 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
1598 return t->stack_vm_area;
1601 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
1607 #define TNF_MIGRATED 0x01
1608 #define TNF_NO_GROUP 0x02
1609 #define TNF_SHARED 0x04
1610 #define TNF_FAULT_LOCAL 0x08
1611 #define TNF_MIGRATE_FAIL 0x10
1613 static inline bool in_vfork(struct task_struct *tsk)
1618 * need RCU to access ->real_parent if CLONE_VM was used along with
1621 * We check real_parent->mm == tsk->mm because CLONE_VFORK does not
1624 * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus
1625 * ->real_parent is not necessarily the task doing vfork(), so in
1626 * theory we can't rely on task_lock() if we want to dereference it.
1628 * And in this case we can't trust the real_parent->mm == tsk->mm
1629 * check, it can be false negative. But we do not care, if init or
1630 * another oom-unkillable task does this it should blame itself.
1633 ret = tsk->vfork_done && tsk->real_parent->mm == tsk->mm;
1639 #ifdef CONFIG_NUMA_BALANCING
1640 extern void task_numa_fault(int last_node, int node, int pages, int flags);
1641 extern pid_t task_numa_group_id(struct task_struct *p);
1642 extern void set_numabalancing_state(bool enabled);
1643 extern void task_numa_free(struct task_struct *p);
1644 extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
1645 int src_nid, int dst_cpu);
1647 static inline void task_numa_fault(int last_node, int node, int pages,
1651 static inline pid_t task_numa_group_id(struct task_struct *p)
1655 static inline void set_numabalancing_state(bool enabled)
1658 static inline void task_numa_free(struct task_struct *p)
1661 static inline bool should_numa_migrate_memory(struct task_struct *p,
1662 struct page *page, int src_nid, int dst_cpu)
1668 static inline struct pid *task_pid(struct task_struct *task)
1670 return task->pids[PIDTYPE_PID].pid;
1673 static inline struct pid *task_tgid(struct task_struct *task)
1675 return task->group_leader->pids[PIDTYPE_PID].pid;
1679 * Without tasklist or rcu lock it is not safe to dereference
1680 * the result of task_pgrp/task_session even if task == current,
1681 * we can race with another thread doing sys_setsid/sys_setpgid.
1683 static inline struct pid *task_pgrp(struct task_struct *task)
1685 return task->group_leader->pids[PIDTYPE_PGID].pid;
1688 static inline struct pid *task_session(struct task_struct *task)
1690 return task->group_leader->pids[PIDTYPE_SID].pid;
1693 struct pid_namespace;
1696 * the helpers to get the task's different pids as they are seen
1697 * from various namespaces
1699 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1700 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1702 * task_xid_nr_ns() : id seen from the ns specified;
1704 * set_task_vxid() : assigns a virtual id to a task;
1706 * see also pid_nr() etc in include/linux/pid.h
1708 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1709 struct pid_namespace *ns);
1711 static inline pid_t task_pid_nr(struct task_struct *tsk)
1716 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1717 struct pid_namespace *ns)
1719 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1722 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1724 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1728 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1733 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1735 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1737 return pid_vnr(task_tgid(tsk));
1741 static inline int pid_alive(const struct task_struct *p);
1742 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
1748 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
1754 static inline pid_t task_ppid_nr(const struct task_struct *tsk)
1756 return task_ppid_nr_ns(tsk, &init_pid_ns);
1759 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1760 struct pid_namespace *ns)
1762 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1765 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1767 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1771 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1772 struct pid_namespace *ns)
1774 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1777 static inline pid_t task_session_vnr(struct task_struct *tsk)
1779 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1782 /* obsolete, do not use */
1783 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1785 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1789 * pid_alive - check that a task structure is not stale
1790 * @p: Task structure to be checked.
1792 * Test if a process is not yet dead (at most zombie state)
1793 * If pid_alive fails, then pointers within the task structure
1794 * can be stale and must not be dereferenced.
1796 * Return: 1 if the process is alive. 0 otherwise.
1798 static inline int pid_alive(const struct task_struct *p)
1800 return p->pids[PIDTYPE_PID].pid != NULL;
1804 * is_global_init - check if a task structure is init. Since init
1805 * is free to have sub-threads we need to check tgid.
1806 * @tsk: Task structure to be checked.
1808 * Check if a task structure is the first user space task the kernel created.
1810 * Return: 1 if the task structure is init. 0 otherwise.
1812 static inline int is_global_init(struct task_struct *tsk)
1814 return task_tgid_nr(tsk) == 1;
1817 extern struct pid *cad_pid;
1819 extern void free_task(struct task_struct *tsk);
1820 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1822 extern void __put_task_struct(struct task_struct *t);
1824 static inline void put_task_struct(struct task_struct *t)
1826 if (atomic_dec_and_test(&t->usage))
1827 __put_task_struct(t);
1830 struct task_struct *task_rcu_dereference(struct task_struct **ptask);
1831 struct task_struct *try_get_task_struct(struct task_struct **ptask);
1833 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1834 extern void task_cputime(struct task_struct *t,
1835 u64 *utime, u64 *stime);
1836 extern u64 task_gtime(struct task_struct *t);
1838 static inline void task_cputime(struct task_struct *t,
1839 u64 *utime, u64 *stime)
1845 static inline u64 task_gtime(struct task_struct *t)
1851 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1852 static inline void task_cputime_scaled(struct task_struct *t,
1856 *utimescaled = t->utimescaled;
1857 *stimescaled = t->stimescaled;
1860 static inline void task_cputime_scaled(struct task_struct *t,
1864 task_cputime(t, utimescaled, stimescaled);
1868 extern void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st);
1869 extern void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st);
1874 #define PF_IDLE 0x00000002 /* I am an IDLE thread */
1875 #define PF_EXITING 0x00000004 /* getting shut down */
1876 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1877 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1878 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1879 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1880 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1881 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1882 #define PF_DUMPCORE 0x00000200 /* dumped core */
1883 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1884 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1885 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1886 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1887 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1888 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1889 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1890 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1891 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1892 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1893 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1894 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1895 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1896 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1897 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1898 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1899 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1900 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1901 #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */
1904 * Only the _current_ task can read/write to tsk->flags, but other
1905 * tasks can access tsk->flags in readonly mode for example
1906 * with tsk_used_math (like during threaded core dumping).
1907 * There is however an exception to this rule during ptrace
1908 * or during fork: the ptracer task is allowed to write to the
1909 * child->flags of its traced child (same goes for fork, the parent
1910 * can write to the child->flags), because we're guaranteed the
1911 * child is not running and in turn not changing child->flags
1912 * at the same time the parent does it.
1914 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1915 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1916 #define clear_used_math() clear_stopped_child_used_math(current)
1917 #define set_used_math() set_stopped_child_used_math(current)
1918 #define conditional_stopped_child_used_math(condition, child) \
1919 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1920 #define conditional_used_math(condition) \
1921 conditional_stopped_child_used_math(condition, current)
1922 #define copy_to_stopped_child_used_math(child) \
1923 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1924 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1925 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1926 #define used_math() tsk_used_math(current)
1928 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
1929 * __GFP_FS is also cleared as it implies __GFP_IO.
1931 static inline gfp_t memalloc_noio_flags(gfp_t flags)
1933 if (unlikely(current->flags & PF_MEMALLOC_NOIO))
1934 flags &= ~(__GFP_IO | __GFP_FS);
1938 static inline unsigned int memalloc_noio_save(void)
1940 unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
1941 current->flags |= PF_MEMALLOC_NOIO;
1945 static inline void memalloc_noio_restore(unsigned int flags)
1947 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
1950 /* Per-process atomic flags. */
1951 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
1952 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
1953 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
1954 #define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */
1957 #define TASK_PFA_TEST(name, func) \
1958 static inline bool task_##func(struct task_struct *p) \
1959 { return test_bit(PFA_##name, &p->atomic_flags); }
1960 #define TASK_PFA_SET(name, func) \
1961 static inline void task_set_##func(struct task_struct *p) \
1962 { set_bit(PFA_##name, &p->atomic_flags); }
1963 #define TASK_PFA_CLEAR(name, func) \
1964 static inline void task_clear_##func(struct task_struct *p) \
1965 { clear_bit(PFA_##name, &p->atomic_flags); }
1967 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
1968 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
1970 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
1971 TASK_PFA_SET(SPREAD_PAGE, spread_page)
1972 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
1974 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
1975 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
1976 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
1978 TASK_PFA_TEST(LMK_WAITING, lmk_waiting)
1979 TASK_PFA_SET(LMK_WAITING, lmk_waiting)
1982 * task->jobctl flags
1984 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1986 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1987 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1988 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1989 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1990 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1991 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1992 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1994 #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT)
1995 #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT)
1996 #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT)
1997 #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT)
1998 #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT)
1999 #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT)
2000 #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT)
2002 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2003 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2005 extern bool task_set_jobctl_pending(struct task_struct *task,
2006 unsigned long mask);
2007 extern void task_clear_jobctl_trapping(struct task_struct *task);
2008 extern void task_clear_jobctl_pending(struct task_struct *task,
2009 unsigned long mask);
2011 static inline void rcu_copy_process(struct task_struct *p)
2013 #ifdef CONFIG_PREEMPT_RCU
2014 p->rcu_read_lock_nesting = 0;
2015 p->rcu_read_unlock_special.s = 0;
2016 p->rcu_blocked_node = NULL;
2017 INIT_LIST_HEAD(&p->rcu_node_entry);
2018 #endif /* #ifdef CONFIG_PREEMPT_RCU */
2019 #ifdef CONFIG_TASKS_RCU
2020 p->rcu_tasks_holdout = false;
2021 INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
2022 p->rcu_tasks_idle_cpu = -1;
2023 #endif /* #ifdef CONFIG_TASKS_RCU */
2026 static inline void tsk_restore_flags(struct task_struct *task,
2027 unsigned long orig_flags, unsigned long flags)
2029 task->flags &= ~flags;
2030 task->flags |= orig_flags & flags;
2033 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
2034 const struct cpumask *trial);
2035 extern int task_can_attach(struct task_struct *p,
2036 const struct cpumask *cs_cpus_allowed);
2038 extern void do_set_cpus_allowed(struct task_struct *p,
2039 const struct cpumask *new_mask);
2041 extern int set_cpus_allowed_ptr(struct task_struct *p,
2042 const struct cpumask *new_mask);
2044 static inline void do_set_cpus_allowed(struct task_struct *p,
2045 const struct cpumask *new_mask)
2048 static inline int set_cpus_allowed_ptr(struct task_struct *p,
2049 const struct cpumask *new_mask)
2051 if (!cpumask_test_cpu(0, new_mask))
2057 #ifdef CONFIG_NO_HZ_COMMON
2058 void calc_load_enter_idle(void);
2059 void calc_load_exit_idle(void);
2061 static inline void calc_load_enter_idle(void) { }
2062 static inline void calc_load_exit_idle(void) { }
2063 #endif /* CONFIG_NO_HZ_COMMON */
2065 #ifndef cpu_relax_yield
2066 #define cpu_relax_yield() cpu_relax()
2069 extern unsigned long long
2070 task_sched_runtime(struct task_struct *task);
2072 /* sched_exec is called by processes performing an exec */
2074 extern void sched_exec(void);
2076 #define sched_exec() {}
2079 #ifdef CONFIG_HOTPLUG_CPU
2080 extern void idle_task_exit(void);
2082 static inline void idle_task_exit(void) {}
2085 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2086 extern void wake_up_nohz_cpu(int cpu);
2088 static inline void wake_up_nohz_cpu(int cpu) { }
2091 #ifdef CONFIG_NO_HZ_FULL
2092 extern u64 scheduler_tick_max_deferment(void);
2095 extern int yield_to(struct task_struct *p, bool preempt);
2096 extern void set_user_nice(struct task_struct *p, long nice);
2097 extern int task_prio(const struct task_struct *p);
2099 * task_nice - return the nice value of a given task.
2100 * @p: the task in question.
2102 * Return: The nice value [ -20 ... 0 ... 19 ].
2104 static inline int task_nice(const struct task_struct *p)
2106 return PRIO_TO_NICE((p)->static_prio);
2108 extern int can_nice(const struct task_struct *p, const int nice);
2109 extern int task_curr(const struct task_struct *p);
2110 extern int idle_cpu(int cpu);
2111 extern int sched_setscheduler(struct task_struct *, int,
2112 const struct sched_param *);
2113 extern int sched_setscheduler_nocheck(struct task_struct *, int,
2114 const struct sched_param *);
2115 extern int sched_setattr(struct task_struct *,
2116 const struct sched_attr *);
2117 extern struct task_struct *idle_task(int cpu);
2119 * is_idle_task - is the specified task an idle task?
2120 * @p: the task in question.
2122 * Return: 1 if @p is an idle task. 0 otherwise.
2124 static inline bool is_idle_task(const struct task_struct *p)
2126 return !!(p->flags & PF_IDLE);
2128 extern struct task_struct *curr_task(int cpu);
2129 extern void ia64_set_curr_task(int cpu, struct task_struct *p);
2133 union thread_union {
2134 #ifndef CONFIG_THREAD_INFO_IN_TASK
2135 struct thread_info thread_info;
2137 unsigned long stack[THREAD_SIZE/sizeof(long)];
2140 #ifndef __HAVE_ARCH_KSTACK_END
2141 static inline int kstack_end(void *addr)
2143 /* Reliable end of stack detection:
2144 * Some APM bios versions misalign the stack
2146 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2150 extern union thread_union init_thread_union;
2151 extern struct task_struct init_task;
2153 extern struct mm_struct init_mm;
2155 extern struct pid_namespace init_pid_ns;
2158 * find a task by one of its numerical ids
2160 * find_task_by_pid_ns():
2161 * finds a task by its pid in the specified namespace
2162 * find_task_by_vpid():
2163 * finds a task by its virtual pid
2165 * see also find_vpid() etc in include/linux/pid.h
2168 extern struct task_struct *find_task_by_vpid(pid_t nr);
2169 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2170 struct pid_namespace *ns);
2172 /* per-UID process charging. */
2173 extern struct user_struct * alloc_uid(kuid_t);
2174 static inline struct user_struct *get_uid(struct user_struct *u)
2176 atomic_inc(&u->__count);
2179 extern void free_uid(struct user_struct *);
2181 #include <asm/current.h>
2183 extern void xtime_update(unsigned long ticks);
2185 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2186 extern int wake_up_process(struct task_struct *tsk);
2187 extern void wake_up_new_task(struct task_struct *tsk);
2189 extern void kick_process(struct task_struct *tsk);
2191 static inline void kick_process(struct task_struct *tsk) { }
2193 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
2194 extern void sched_dead(struct task_struct *p);
2196 extern void proc_caches_init(void);
2197 extern void flush_signals(struct task_struct *);
2198 extern void ignore_signals(struct task_struct *);
2199 extern void flush_signal_handlers(struct task_struct *, int force_default);
2200 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2202 static inline int kernel_dequeue_signal(siginfo_t *info)
2204 struct task_struct *tsk = current;
2208 spin_lock_irq(&tsk->sighand->siglock);
2209 ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);
2210 spin_unlock_irq(&tsk->sighand->siglock);
2215 static inline void kernel_signal_stop(void)
2217 spin_lock_irq(¤t->sighand->siglock);
2218 if (current->jobctl & JOBCTL_STOP_DEQUEUED)
2219 __set_current_state(TASK_STOPPED);
2220 spin_unlock_irq(¤t->sighand->siglock);
2225 extern void release_task(struct task_struct * p);
2226 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2227 extern int force_sigsegv(int, struct task_struct *);
2228 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2229 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2230 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2231 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2232 const struct cred *, u32);
2233 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2234 extern int kill_pid(struct pid *pid, int sig, int priv);
2235 extern int kill_proc_info(int, struct siginfo *, pid_t);
2236 extern __must_check bool do_notify_parent(struct task_struct *, int);
2237 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2238 extern void force_sig(int, struct task_struct *);
2239 extern int send_sig(int, struct task_struct *, int);
2240 extern int zap_other_threads(struct task_struct *p);
2241 extern struct sigqueue *sigqueue_alloc(void);
2242 extern void sigqueue_free(struct sigqueue *);
2243 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2244 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2246 #ifdef TIF_RESTORE_SIGMASK
2248 * Legacy restore_sigmask accessors. These are inefficient on
2249 * SMP architectures because they require atomic operations.
2253 * set_restore_sigmask() - make sure saved_sigmask processing gets done
2255 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
2256 * will run before returning to user mode, to process the flag. For
2257 * all callers, TIF_SIGPENDING is already set or it's no harm to set
2258 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
2259 * arch code will notice on return to user mode, in case those bits
2260 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
2261 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
2263 static inline void set_restore_sigmask(void)
2265 set_thread_flag(TIF_RESTORE_SIGMASK);
2266 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
2268 static inline void clear_restore_sigmask(void)
2270 clear_thread_flag(TIF_RESTORE_SIGMASK);
2272 static inline bool test_restore_sigmask(void)
2274 return test_thread_flag(TIF_RESTORE_SIGMASK);
2276 static inline bool test_and_clear_restore_sigmask(void)
2278 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
2281 #else /* TIF_RESTORE_SIGMASK */
2283 /* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
2284 static inline void set_restore_sigmask(void)
2286 current->restore_sigmask = true;
2287 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
2289 static inline void clear_restore_sigmask(void)
2291 current->restore_sigmask = false;
2293 static inline bool test_restore_sigmask(void)
2295 return current->restore_sigmask;
2297 static inline bool test_and_clear_restore_sigmask(void)
2299 if (!current->restore_sigmask)
2301 current->restore_sigmask = false;
2306 static inline void restore_saved_sigmask(void)
2308 if (test_and_clear_restore_sigmask())
2309 __set_current_blocked(¤t->saved_sigmask);
2312 static inline sigset_t *sigmask_to_save(void)
2314 sigset_t *res = ¤t->blocked;
2315 if (unlikely(test_restore_sigmask()))
2316 res = ¤t->saved_sigmask;
2320 static inline int kill_cad_pid(int sig, int priv)
2322 return kill_pid(cad_pid, sig, priv);
2325 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2326 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2327 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2328 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2331 * True if we are on the alternate signal stack.
2333 static inline int on_sig_stack(unsigned long sp)
2336 * If the signal stack is SS_AUTODISARM then, by construction, we
2337 * can't be on the signal stack unless user code deliberately set
2338 * SS_AUTODISARM when we were already on it.
2340 * This improves reliability: if user state gets corrupted such that
2341 * the stack pointer points very close to the end of the signal stack,
2342 * then this check will enable the signal to be handled anyway.
2344 if (current->sas_ss_flags & SS_AUTODISARM)
2347 #ifdef CONFIG_STACK_GROWSUP
2348 return sp >= current->sas_ss_sp &&
2349 sp - current->sas_ss_sp < current->sas_ss_size;
2351 return sp > current->sas_ss_sp &&
2352 sp - current->sas_ss_sp <= current->sas_ss_size;
2356 static inline int sas_ss_flags(unsigned long sp)
2358 if (!current->sas_ss_size)
2361 return on_sig_stack(sp) ? SS_ONSTACK : 0;
2364 static inline void sas_ss_reset(struct task_struct *p)
2368 p->sas_ss_flags = SS_DISABLE;
2371 static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
2373 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
2374 #ifdef CONFIG_STACK_GROWSUP
2375 return current->sas_ss_sp;
2377 return current->sas_ss_sp + current->sas_ss_size;
2383 * Routines for handling mm_structs
2385 extern struct mm_struct * mm_alloc(void);
2388 * mmgrab() - Pin a &struct mm_struct.
2389 * @mm: The &struct mm_struct to pin.
2391 * Make sure that @mm will not get freed even after the owning task
2392 * exits. This doesn't guarantee that the associated address space
2393 * will still exist later on and mmget_not_zero() has to be used before
2396 * This is a preferred way to to pin @mm for a longer/unbounded amount
2399 * Use mmdrop() to release the reference acquired by mmgrab().
2401 * See also <Documentation/vm/active_mm.txt> for an in-depth explanation
2402 * of &mm_struct.mm_count vs &mm_struct.mm_users.
2404 static inline void mmgrab(struct mm_struct *mm)
2406 atomic_inc(&mm->mm_count);
2409 /* mmdrop drops the mm and the page tables */
2410 extern void __mmdrop(struct mm_struct *);
2411 static inline void mmdrop(struct mm_struct *mm)
2413 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2417 static inline void mmdrop_async_fn(struct work_struct *work)
2419 struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work);
2423 static inline void mmdrop_async(struct mm_struct *mm)
2425 if (unlikely(atomic_dec_and_test(&mm->mm_count))) {
2426 INIT_WORK(&mm->async_put_work, mmdrop_async_fn);
2427 schedule_work(&mm->async_put_work);
2432 * mmget() - Pin the address space associated with a &struct mm_struct.
2433 * @mm: The address space to pin.
2435 * Make sure that the address space of the given &struct mm_struct doesn't
2436 * go away. This does not protect against parts of the address space being
2437 * modified or freed, however.
2439 * Never use this function to pin this address space for an
2440 * unbounded/indefinite amount of time.
2442 * Use mmput() to release the reference acquired by mmget().
2444 * See also <Documentation/vm/active_mm.txt> for an in-depth explanation
2445 * of &mm_struct.mm_count vs &mm_struct.mm_users.
2447 static inline void mmget(struct mm_struct *mm)
2449 atomic_inc(&mm->mm_users);
2452 static inline bool mmget_not_zero(struct mm_struct *mm)
2454 return atomic_inc_not_zero(&mm->mm_users);
2457 /* mmput gets rid of the mappings and all user-space */
2458 extern void mmput(struct mm_struct *);
2460 /* same as above but performs the slow path from the async context. Can
2461 * be called from the atomic context as well
2463 extern void mmput_async(struct mm_struct *);
2466 /* Grab a reference to a task's mm, if it is not already going away */
2467 extern struct mm_struct *get_task_mm(struct task_struct *task);
2469 * Grab a reference to a task's mm, if it is not already going away
2470 * and ptrace_may_access with the mode parameter passed to it
2473 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2474 /* Remove the current tasks stale references to the old mm_struct */
2475 extern void mm_release(struct task_struct *, struct mm_struct *);
2477 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
2478 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
2479 struct task_struct *, unsigned long);
2481 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2482 struct task_struct *);
2484 /* Architectures that haven't opted into copy_thread_tls get the tls argument
2485 * via pt_regs, so ignore the tls argument passed via C. */
2486 static inline int copy_thread_tls(
2487 unsigned long clone_flags, unsigned long sp, unsigned long arg,
2488 struct task_struct *p, unsigned long tls)
2490 return copy_thread(clone_flags, sp, arg, p);
2493 extern void flush_thread(void);
2495 #ifdef CONFIG_HAVE_EXIT_THREAD
2496 extern void exit_thread(struct task_struct *tsk);
2498 static inline void exit_thread(struct task_struct *tsk)
2503 extern void exit_files(struct task_struct *);
2504 extern void __cleanup_sighand(struct sighand_struct *);
2506 extern void exit_itimers(struct signal_struct *);
2507 extern void flush_itimer_signals(void);
2509 extern void do_group_exit(int);
2511 extern int do_execve(struct filename *,
2512 const char __user * const __user *,
2513 const char __user * const __user *);
2514 extern int do_execveat(int, struct filename *,
2515 const char __user * const __user *,
2516 const char __user * const __user *,
2518 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
2519 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2520 struct task_struct *fork_idle(int);
2521 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
2523 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
2524 static inline void set_task_comm(struct task_struct *tsk, const char *from)
2526 __set_task_comm(tsk, from, false);
2528 extern char *get_task_comm(char *to, struct task_struct *tsk);
2531 void scheduler_ipi(void);
2532 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2534 static inline void scheduler_ipi(void) { }
2535 static inline unsigned long wait_task_inactive(struct task_struct *p,
2542 #define tasklist_empty() \
2543 list_empty(&init_task.tasks)
2545 #define next_task(p) \
2546 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2548 #define for_each_process(p) \
2549 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2551 extern bool current_is_single_threaded(void);
2554 * Careful: do_each_thread/while_each_thread is a double loop so
2555 * 'break' will not work as expected - use goto instead.
2557 #define do_each_thread(g, t) \
2558 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2560 #define while_each_thread(g, t) \
2561 while ((t = next_thread(t)) != g)
2563 #define __for_each_thread(signal, t) \
2564 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2566 #define for_each_thread(p, t) \
2567 __for_each_thread((p)->signal, t)
2569 /* Careful: this is a double loop, 'break' won't work as expected. */
2570 #define for_each_process_thread(p, t) \
2571 for_each_process(p) for_each_thread(p, t)
2573 typedef int (*proc_visitor)(struct task_struct *p, void *data);
2574 void walk_process_tree(struct task_struct *top, proc_visitor, void *);
2576 static inline int get_nr_threads(struct task_struct *tsk)
2578 return tsk->signal->nr_threads;
2581 static inline bool thread_group_leader(struct task_struct *p)
2583 return p->exit_signal >= 0;
2586 /* Do to the insanities of de_thread it is possible for a process
2587 * to have the pid of the thread group leader without actually being
2588 * the thread group leader. For iteration through the pids in proc
2589 * all we care about is that we have a task with the appropriate
2590 * pid, we don't actually care if we have the right task.
2592 static inline bool has_group_leader_pid(struct task_struct *p)
2594 return task_pid(p) == p->signal->leader_pid;
2598 bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
2600 return p1->signal == p2->signal;
2603 static inline struct task_struct *next_thread(const struct task_struct *p)
2605 return list_entry_rcu(p->thread_group.next,
2606 struct task_struct, thread_group);
2609 static inline int thread_group_empty(struct task_struct *p)
2611 return list_empty(&p->thread_group);
2614 #define delay_group_leader(p) \
2615 (thread_group_leader(p) && !thread_group_empty(p))
2618 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2619 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2620 * pins the final release of task.io_context. Also protects ->cpuset and
2621 * ->cgroup.subsys[]. And ->vfork_done.
2623 * Nests both inside and outside of read_lock(&tasklist_lock).
2624 * It must not be nested with write_lock_irq(&tasklist_lock),
2625 * neither inside nor outside.
2627 static inline void task_lock(struct task_struct *p)
2629 spin_lock(&p->alloc_lock);
2632 static inline void task_unlock(struct task_struct *p)
2634 spin_unlock(&p->alloc_lock);
2637 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2638 unsigned long *flags);
2640 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2641 unsigned long *flags)
2643 struct sighand_struct *ret;
2645 ret = __lock_task_sighand(tsk, flags);
2646 (void)__cond_lock(&tsk->sighand->siglock, ret);
2650 static inline void unlock_task_sighand(struct task_struct *tsk,
2651 unsigned long *flags)
2653 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2656 #ifdef CONFIG_THREAD_INFO_IN_TASK
2658 static inline struct thread_info *task_thread_info(struct task_struct *task)
2660 return &task->thread_info;
2664 * When accessing the stack of a non-current task that might exit, use
2665 * try_get_task_stack() instead. task_stack_page will return a pointer
2666 * that could get freed out from under you.
2668 static inline void *task_stack_page(const struct task_struct *task)
2673 #define setup_thread_stack(new,old) do { } while(0)
2675 static inline unsigned long *end_of_stack(const struct task_struct *task)
2680 #elif !defined(__HAVE_THREAD_FUNCTIONS)
2682 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2683 #define task_stack_page(task) ((void *)(task)->stack)
2685 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2687 *task_thread_info(p) = *task_thread_info(org);
2688 task_thread_info(p)->task = p;
2692 * Return the address of the last usable long on the stack.
2694 * When the stack grows down, this is just above the thread
2695 * info struct. Going any lower will corrupt the threadinfo.
2697 * When the stack grows up, this is the highest address.
2698 * Beyond that position, we corrupt data on the next page.
2700 static inline unsigned long *end_of_stack(struct task_struct *p)
2702 #ifdef CONFIG_STACK_GROWSUP
2703 return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
2705 return (unsigned long *)(task_thread_info(p) + 1);
2711 #ifdef CONFIG_THREAD_INFO_IN_TASK
2712 static inline void *try_get_task_stack(struct task_struct *tsk)
2714 return atomic_inc_not_zero(&tsk->stack_refcount) ?
2715 task_stack_page(tsk) : NULL;
2718 extern void put_task_stack(struct task_struct *tsk);
2720 static inline void *try_get_task_stack(struct task_struct *tsk)
2722 return task_stack_page(tsk);
2725 static inline void put_task_stack(struct task_struct *tsk) {}
2728 #define task_stack_end_corrupted(task) \
2729 (*(end_of_stack(task)) != STACK_END_MAGIC)
2731 static inline int object_is_on_stack(void *obj)
2733 void *stack = task_stack_page(current);
2735 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2738 extern void thread_stack_cache_init(void);
2740 #ifdef CONFIG_DEBUG_STACK_USAGE
2741 static inline unsigned long stack_not_used(struct task_struct *p)
2743 unsigned long *n = end_of_stack(p);
2745 do { /* Skip over canary */
2746 # ifdef CONFIG_STACK_GROWSUP
2753 # ifdef CONFIG_STACK_GROWSUP
2754 return (unsigned long)end_of_stack(p) - (unsigned long)n;
2756 return (unsigned long)n - (unsigned long)end_of_stack(p);
2760 extern void set_task_stack_end_magic(struct task_struct *tsk);
2762 /* set thread flags in other task's structures
2763 * - see asm/thread_info.h for TIF_xxxx flags available
2765 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2767 set_ti_thread_flag(task_thread_info(tsk), flag);
2770 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2772 clear_ti_thread_flag(task_thread_info(tsk), flag);
2775 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2777 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2780 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2782 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2785 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2787 return test_ti_thread_flag(task_thread_info(tsk), flag);
2790 static inline void set_tsk_need_resched(struct task_struct *tsk)
2792 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2795 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2797 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2800 static inline int test_tsk_need_resched(struct task_struct *tsk)
2802 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2805 static inline int restart_syscall(void)
2807 set_tsk_thread_flag(current, TIF_SIGPENDING);
2808 return -ERESTARTNOINTR;
2811 static inline int signal_pending(struct task_struct *p)
2813 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2816 static inline int __fatal_signal_pending(struct task_struct *p)
2818 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2821 static inline int fatal_signal_pending(struct task_struct *p)
2823 return signal_pending(p) && __fatal_signal_pending(p);
2826 static inline int signal_pending_state(long state, struct task_struct *p)
2828 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2830 if (!signal_pending(p))
2833 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2837 * cond_resched() and cond_resched_lock(): latency reduction via
2838 * explicit rescheduling in places that are safe. The return
2839 * value indicates whether a reschedule was done in fact.
2840 * cond_resched_lock() will drop the spinlock before scheduling,
2841 * cond_resched_softirq() will enable bhs before scheduling.
2843 #ifndef CONFIG_PREEMPT
2844 extern int _cond_resched(void);
2846 static inline int _cond_resched(void) { return 0; }
2849 #define cond_resched() ({ \
2850 ___might_sleep(__FILE__, __LINE__, 0); \
2854 extern int __cond_resched_lock(spinlock_t *lock);
2856 #define cond_resched_lock(lock) ({ \
2857 ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
2858 __cond_resched_lock(lock); \
2861 extern int __cond_resched_softirq(void);
2863 #define cond_resched_softirq() ({ \
2864 ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2865 __cond_resched_softirq(); \
2868 static inline void cond_resched_rcu(void)
2870 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2878 * Does a critical section need to be broken due to another
2879 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2880 * but a general need for low latency)
2882 static inline int spin_needbreak(spinlock_t *lock)
2884 #ifdef CONFIG_PREEMPT
2885 return spin_is_contended(lock);
2891 static __always_inline bool need_resched(void)
2893 return unlikely(tif_need_resched());
2897 * Thread group CPU time accounting.
2899 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2900 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2903 * Reevaluate whether the task has signals pending delivery.
2904 * Wake the task if so.
2905 * This is required every time the blocked sigset_t changes.
2906 * callers must hold sighand->siglock.
2908 extern void recalc_sigpending_and_wake(struct task_struct *t);
2909 extern void recalc_sigpending(void);
2911 extern void signal_wake_up_state(struct task_struct *t, unsigned int state);
2913 static inline void signal_wake_up(struct task_struct *t, bool resume)
2915 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
2917 static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
2919 signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
2923 * Wrappers for p->thread_info->cpu access. No-op on UP.
2927 static inline unsigned int task_cpu(const struct task_struct *p)
2929 #ifdef CONFIG_THREAD_INFO_IN_TASK
2932 return task_thread_info(p)->cpu;
2936 static inline int task_node(const struct task_struct *p)
2938 return cpu_to_node(task_cpu(p));
2941 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2945 static inline unsigned int task_cpu(const struct task_struct *p)
2950 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2954 #endif /* CONFIG_SMP */
2957 * In order to reduce various lock holder preemption latencies provide an
2958 * interface to see if a vCPU is currently running or not.
2960 * This allows us to terminate optimistic spin loops and block, analogous to
2961 * the native optimistic spin heuristic of testing if the lock owner task is
2964 #ifndef vcpu_is_preempted
2965 # define vcpu_is_preempted(cpu) false
2968 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2969 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2971 #ifdef CONFIG_CGROUP_SCHED
2972 extern struct task_group root_task_group;
2973 #endif /* CONFIG_CGROUP_SCHED */
2975 extern int task_can_switch_user(struct user_struct *up,
2976 struct task_struct *tsk);
2978 #ifdef CONFIG_TASK_XACCT
2979 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2981 tsk->ioac.rchar += amt;
2984 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2986 tsk->ioac.wchar += amt;
2989 static inline void inc_syscr(struct task_struct *tsk)
2994 static inline void inc_syscw(struct task_struct *tsk)
2999 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
3003 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
3007 static inline void inc_syscr(struct task_struct *tsk)
3011 static inline void inc_syscw(struct task_struct *tsk)
3016 #ifndef TASK_SIZE_OF
3017 #define TASK_SIZE_OF(tsk) TASK_SIZE
3021 extern void mm_update_next_owner(struct mm_struct *mm);
3023 static inline void mm_update_next_owner(struct mm_struct *mm)
3026 #endif /* CONFIG_MEMCG */
3028 static inline unsigned long task_rlimit(const struct task_struct *tsk,
3031 return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
3034 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
3037 return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
3040 static inline unsigned long rlimit(unsigned int limit)
3042 return task_rlimit(current, limit);
3045 static inline unsigned long rlimit_max(unsigned int limit)
3047 return task_rlimit_max(current, limit);
3050 #define SCHED_CPUFREQ_RT (1U << 0)
3051 #define SCHED_CPUFREQ_DL (1U << 1)
3052 #define SCHED_CPUFREQ_IOWAIT (1U << 2)
3054 #define SCHED_CPUFREQ_RT_DL (SCHED_CPUFREQ_RT | SCHED_CPUFREQ_DL)
3056 #ifdef CONFIG_CPU_FREQ
3057 struct update_util_data {
3058 void (*func)(struct update_util_data *data, u64 time, unsigned int flags);
3061 void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data,
3062 void (*func)(struct update_util_data *data, u64 time,
3063 unsigned int flags));
3064 void cpufreq_remove_update_util_hook(int cpu);
3065 #endif /* CONFIG_CPU_FREQ */