1 /* SPDX-License-Identifier: GPL-2.0 */
6 * Define 'struct task_struct' and provide the main scheduler
7 * APIs (schedule(), wakeup variants, etc.)
10 #include <uapi/linux/sched.h>
12 #include <asm/current.h>
14 #include <linux/pid.h>
15 #include <linux/sem.h>
16 #include <linux/shm.h>
17 #include <linux/mutex.h>
18 #include <linux/plist.h>
19 #include <linux/hrtimer.h>
20 #include <linux/irqflags.h>
21 #include <linux/seccomp.h>
22 #include <linux/nodemask.h>
23 #include <linux/rcupdate.h>
24 #include <linux/refcount.h>
25 #include <linux/resource.h>
26 #include <linux/latencytop.h>
27 #include <linux/sched/prio.h>
28 #include <linux/sched/types.h>
29 #include <linux/signal_types.h>
30 #include <linux/syscall_user_dispatch.h>
31 #include <linux/mm_types_task.h>
32 #include <linux/task_io_accounting.h>
33 #include <linux/posix-timers.h>
34 #include <linux/rseq.h>
35 #include <linux/seqlock.h>
36 #include <linux/kcsan.h>
38 #include <asm/kmap_size.h>
40 /* task_struct member predeclarations (sorted alphabetically): */
42 struct backing_dev_info;
45 struct bpf_local_storage;
47 struct capture_control;
50 struct futex_pi_state;
56 struct perf_event_context;
58 struct pipe_inode_info;
61 struct robust_list_head;
67 struct sighand_struct;
69 struct task_delay_info;
73 * Task state bitmask. NOTE! These bits are also
74 * encoded in fs/proc/array.c: get_task_state().
76 * We have two separate sets of flags: task->state
77 * is about runnability, while task->exit_state are
78 * about the task exiting. Confusing, but this way
79 * modifying one set can't modify the other one by
83 /* Used in tsk->state: */
84 #define TASK_RUNNING 0x0000
85 #define TASK_INTERRUPTIBLE 0x0001
86 #define TASK_UNINTERRUPTIBLE 0x0002
87 #define __TASK_STOPPED 0x0004
88 #define __TASK_TRACED 0x0008
89 /* Used in tsk->exit_state: */
90 #define EXIT_DEAD 0x0010
91 #define EXIT_ZOMBIE 0x0020
92 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
93 /* Used in tsk->state again: */
94 #define TASK_PARKED 0x0040
95 #define TASK_DEAD 0x0080
96 #define TASK_WAKEKILL 0x0100
97 #define TASK_WAKING 0x0200
98 #define TASK_NOLOAD 0x0400
99 #define TASK_NEW 0x0800
100 /* RT specific auxilliary flag to mark RT lock waiters */
101 #define TASK_RTLOCK_WAIT 0x1000
102 #define TASK_STATE_MAX 0x2000
104 /* Convenience macros for the sake of set_current_state: */
105 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
106 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
107 #define TASK_TRACED __TASK_TRACED
109 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
111 /* Convenience macros for the sake of wake_up(): */
112 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
114 /* get_task_state(): */
115 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
116 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
117 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
120 #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING)
122 #define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
123 #define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
124 #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
127 * Special states are those that do not use the normal wait-loop pattern. See
128 * the comment with set_special_state().
130 #define is_special_task_state(state) \
131 ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))
133 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
134 # define debug_normal_state_change(state_value) \
136 WARN_ON_ONCE(is_special_task_state(state_value)); \
137 current->task_state_change = _THIS_IP_; \
140 # define debug_special_state_change(state_value) \
142 WARN_ON_ONCE(!is_special_task_state(state_value)); \
143 current->task_state_change = _THIS_IP_; \
146 # define debug_rtlock_wait_set_state() \
148 current->saved_state_change = current->task_state_change;\
149 current->task_state_change = _THIS_IP_; \
152 # define debug_rtlock_wait_restore_state() \
154 current->task_state_change = current->saved_state_change;\
158 # define debug_normal_state_change(cond) do { } while (0)
159 # define debug_special_state_change(cond) do { } while (0)
160 # define debug_rtlock_wait_set_state() do { } while (0)
161 # define debug_rtlock_wait_restore_state() do { } while (0)
165 * set_current_state() includes a barrier so that the write of current->state
166 * is correctly serialised wrt the caller's subsequent test of whether to
170 * set_current_state(TASK_UNINTERRUPTIBLE);
176 * __set_current_state(TASK_RUNNING);
178 * If the caller does not need such serialisation (because, for instance, the
179 * CONDITION test and condition change and wakeup are under the same lock) then
180 * use __set_current_state().
182 * The above is typically ordered against the wakeup, which does:
185 * wake_up_state(p, TASK_UNINTERRUPTIBLE);
187 * where wake_up_state()/try_to_wake_up() executes a full memory barrier before
188 * accessing p->state.
190 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
191 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
192 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
194 * However, with slightly different timing the wakeup TASK_RUNNING store can
195 * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
196 * a problem either because that will result in one extra go around the loop
197 * and our @cond test will save the day.
199 * Also see the comments of try_to_wake_up().
201 #define __set_current_state(state_value) \
203 debug_normal_state_change((state_value)); \
204 WRITE_ONCE(current->__state, (state_value)); \
207 #define set_current_state(state_value) \
209 debug_normal_state_change((state_value)); \
210 smp_store_mb(current->__state, (state_value)); \
214 * set_special_state() should be used for those states when the blocking task
215 * can not use the regular condition based wait-loop. In that case we must
216 * serialize against wakeups such that any possible in-flight TASK_RUNNING
217 * stores will not collide with our state change.
219 #define set_special_state(state_value) \
221 unsigned long flags; /* may shadow */ \
223 raw_spin_lock_irqsave(¤t->pi_lock, flags); \
224 debug_special_state_change((state_value)); \
225 WRITE_ONCE(current->__state, (state_value)); \
226 raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \
230 * PREEMPT_RT specific variants for "sleeping" spin/rwlocks
232 * RT's spin/rwlock substitutions are state preserving. The state of the
233 * task when blocking on the lock is saved in task_struct::saved_state and
234 * restored after the lock has been acquired. These operations are
235 * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT
236 * lock related wakeups while the task is blocked on the lock are
237 * redirected to operate on task_struct::saved_state to ensure that these
238 * are not dropped. On restore task_struct::saved_state is set to
239 * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail.
241 * The lock operation looks like this:
243 * current_save_and_set_rtlock_wait_state();
247 * raw_spin_unlock_irq(&lock->wait_lock);
249 * raw_spin_lock_irq(&lock->wait_lock);
250 * set_current_state(TASK_RTLOCK_WAIT);
252 * current_restore_rtlock_saved_state();
254 #define current_save_and_set_rtlock_wait_state() \
256 lockdep_assert_irqs_disabled(); \
257 raw_spin_lock(¤t->pi_lock); \
258 current->saved_state = current->__state; \
259 debug_rtlock_wait_set_state(); \
260 WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \
261 raw_spin_unlock(¤t->pi_lock); \
264 #define current_restore_rtlock_saved_state() \
266 lockdep_assert_irqs_disabled(); \
267 raw_spin_lock(¤t->pi_lock); \
268 debug_rtlock_wait_restore_state(); \
269 WRITE_ONCE(current->__state, current->saved_state); \
270 current->saved_state = TASK_RUNNING; \
271 raw_spin_unlock(¤t->pi_lock); \
274 #define get_current_state() READ_ONCE(current->__state)
277 * Define the task command name length as enum, then it can be visible to
284 extern void scheduler_tick(void);
286 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
288 extern long schedule_timeout(long timeout);
289 extern long schedule_timeout_interruptible(long timeout);
290 extern long schedule_timeout_killable(long timeout);
291 extern long schedule_timeout_uninterruptible(long timeout);
292 extern long schedule_timeout_idle(long timeout);
293 asmlinkage void schedule(void);
294 extern void schedule_preempt_disabled(void);
295 asmlinkage void preempt_schedule_irq(void);
296 #ifdef CONFIG_PREEMPT_RT
297 extern void schedule_rtlock(void);
300 extern int __must_check io_schedule_prepare(void);
301 extern void io_schedule_finish(int token);
302 extern long io_schedule_timeout(long timeout);
303 extern void io_schedule(void);
306 * struct prev_cputime - snapshot of system and user cputime
307 * @utime: time spent in user mode
308 * @stime: time spent in system mode
309 * @lock: protects the above two fields
311 * Stores previous user/system time values such that we can guarantee
314 struct prev_cputime {
315 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
323 /* Task is sleeping or running in a CPU with VTIME inactive: */
327 /* Task runs in kernelspace in a CPU with VTIME active: */
329 /* Task runs in userspace in a CPU with VTIME active: */
331 /* Task runs as guests in a CPU with VTIME active: */
337 unsigned long long starttime;
338 enum vtime_state state;
346 * Utilization clamp constraints.
347 * @UCLAMP_MIN: Minimum utilization
348 * @UCLAMP_MAX: Maximum utilization
349 * @UCLAMP_CNT: Utilization clamp constraints count
358 extern struct root_domain def_root_domain;
359 extern struct mutex sched_domains_mutex;
363 #ifdef CONFIG_SCHED_INFO
364 /* Cumulative counters: */
366 /* # of times we have run on this CPU: */
367 unsigned long pcount;
369 /* Time spent waiting on a runqueue: */
370 unsigned long long run_delay;
374 /* When did we last run on a CPU? */
375 unsigned long long last_arrival;
377 /* When were we last queued to run? */
378 unsigned long long last_queued;
380 #endif /* CONFIG_SCHED_INFO */
384 * Integer metrics need fixed point arithmetic, e.g., sched/fair
385 * has a few: load, load_avg, util_avg, freq, and capacity.
387 * We define a basic fixed point arithmetic range, and then formalize
388 * all these metrics based on that basic range.
390 # define SCHED_FIXEDPOINT_SHIFT 10
391 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
393 /* Increase resolution of cpu_capacity calculations */
394 # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
395 # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
398 unsigned long weight;
403 * struct util_est - Estimation utilization of FAIR tasks
404 * @enqueued: instantaneous estimated utilization of a task/cpu
405 * @ewma: the Exponential Weighted Moving Average (EWMA)
406 * utilization of a task
408 * Support data structure to track an Exponential Weighted Moving Average
409 * (EWMA) of a FAIR task's utilization. New samples are added to the moving
410 * average each time a task completes an activation. Sample's weight is chosen
411 * so that the EWMA will be relatively insensitive to transient changes to the
414 * The enqueued attribute has a slightly different meaning for tasks and cpus:
415 * - task: the task's util_avg at last task dequeue time
416 * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU
417 * Thus, the util_est.enqueued of a task represents the contribution on the
418 * estimated utilization of the CPU where that task is currently enqueued.
420 * Only for tasks we track a moving average of the past instantaneous
421 * estimated utilization. This allows to absorb sporadic drops in utilization
422 * of an otherwise almost periodic task.
424 * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg
425 * updates. When a task is dequeued, its util_est should not be updated if its
426 * util_avg has not been updated in the meantime.
427 * This information is mapped into the MSB bit of util_est.enqueued at dequeue
428 * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg
429 * for a task) it is safe to use MSB.
432 unsigned int enqueued;
434 #define UTIL_EST_WEIGHT_SHIFT 2
435 #define UTIL_AVG_UNCHANGED 0x80000000
436 } __attribute__((__aligned__(sizeof(u64))));
439 * The load/runnable/util_avg accumulates an infinite geometric series
440 * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c).
442 * [load_avg definition]
444 * load_avg = runnable% * scale_load_down(load)
446 * [runnable_avg definition]
448 * runnable_avg = runnable% * SCHED_CAPACITY_SCALE
450 * [util_avg definition]
452 * util_avg = running% * SCHED_CAPACITY_SCALE
454 * where runnable% is the time ratio that a sched_entity is runnable and
455 * running% the time ratio that a sched_entity is running.
457 * For cfs_rq, they are the aggregated values of all runnable and blocked
460 * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU
461 * capacity scaling. The scaling is done through the rq_clock_pelt that is used
462 * for computing those signals (see update_rq_clock_pelt())
464 * N.B., the above ratios (runnable% and running%) themselves are in the
465 * range of [0, 1]. To do fixed point arithmetics, we therefore scale them
466 * to as large a range as necessary. This is for example reflected by
467 * util_avg's SCHED_CAPACITY_SCALE.
471 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
472 * with the highest load (=88761), always runnable on a single cfs_rq,
473 * and should not overflow as the number already hits PID_MAX_LIMIT.
475 * For all other cases (including 32-bit kernels), struct load_weight's
476 * weight will overflow first before we do, because:
478 * Max(load_avg) <= Max(load.weight)
480 * Then it is the load_weight's responsibility to consider overflow
484 u64 last_update_time;
489 unsigned long load_avg;
490 unsigned long runnable_avg;
491 unsigned long util_avg;
492 struct util_est util_est;
493 } ____cacheline_aligned;
495 struct sched_statistics {
496 #ifdef CONFIG_SCHEDSTATS
506 s64 sum_sleep_runtime;
510 s64 sum_block_runtime;
515 u64 nr_migrations_cold;
516 u64 nr_failed_migrations_affine;
517 u64 nr_failed_migrations_running;
518 u64 nr_failed_migrations_hot;
519 u64 nr_forced_migrations;
523 u64 nr_wakeups_migrate;
524 u64 nr_wakeups_local;
525 u64 nr_wakeups_remote;
526 u64 nr_wakeups_affine;
527 u64 nr_wakeups_affine_attempts;
528 u64 nr_wakeups_passive;
531 #ifdef CONFIG_SCHED_CORE
532 u64 core_forceidle_sum;
534 #endif /* CONFIG_SCHEDSTATS */
535 } ____cacheline_aligned;
537 struct sched_entity {
538 /* For load-balancing: */
539 struct load_weight load;
540 struct rb_node run_node;
541 struct list_head group_node;
545 u64 sum_exec_runtime;
547 u64 prev_sum_exec_runtime;
551 #ifdef CONFIG_FAIR_GROUP_SCHED
553 struct sched_entity *parent;
554 /* rq on which this entity is (to be) queued: */
555 struct cfs_rq *cfs_rq;
556 /* rq "owned" by this entity/group: */
558 /* cached value of my_q->h_nr_running */
559 unsigned long runnable_weight;
564 * Per entity load average tracking.
566 * Put into separate cache line so it does not
567 * collide with read-mostly values above.
569 struct sched_avg avg;
573 struct sched_rt_entity {
574 struct list_head run_list;
575 unsigned long timeout;
576 unsigned long watchdog_stamp;
577 unsigned int time_slice;
578 unsigned short on_rq;
579 unsigned short on_list;
581 struct sched_rt_entity *back;
582 #ifdef CONFIG_RT_GROUP_SCHED
583 struct sched_rt_entity *parent;
584 /* rq on which this entity is (to be) queued: */
586 /* rq "owned" by this entity/group: */
589 } __randomize_layout;
591 struct sched_dl_entity {
592 struct rb_node rb_node;
595 * Original scheduling parameters. Copied here from sched_attr
596 * during sched_setattr(), they will remain the same until
597 * the next sched_setattr().
599 u64 dl_runtime; /* Maximum runtime for each instance */
600 u64 dl_deadline; /* Relative deadline of each instance */
601 u64 dl_period; /* Separation of two instances (period) */
602 u64 dl_bw; /* dl_runtime / dl_period */
603 u64 dl_density; /* dl_runtime / dl_deadline */
606 * Actual scheduling parameters. Initialized with the values above,
607 * they are continuously updated during task execution. Note that
608 * the remaining runtime could be < 0 in case we are in overrun.
610 s64 runtime; /* Remaining runtime for this instance */
611 u64 deadline; /* Absolute deadline for this instance */
612 unsigned int flags; /* Specifying the scheduler behaviour */
617 * @dl_throttled tells if we exhausted the runtime. If so, the
618 * task has to wait for a replenishment to be performed at the
619 * next firing of dl_timer.
621 * @dl_yielded tells if task gave up the CPU before consuming
622 * all its available runtime during the last job.
624 * @dl_non_contending tells if the task is inactive while still
625 * contributing to the active utilization. In other words, it
626 * indicates if the inactive timer has been armed and its handler
627 * has not been executed yet. This flag is useful to avoid race
628 * conditions between the inactive timer handler and the wakeup
631 * @dl_overrun tells if the task asked to be informed about runtime
634 unsigned int dl_throttled : 1;
635 unsigned int dl_yielded : 1;
636 unsigned int dl_non_contending : 1;
637 unsigned int dl_overrun : 1;
640 * Bandwidth enforcement timer. Each -deadline task has its
641 * own bandwidth to be enforced, thus we need one timer per task.
643 struct hrtimer dl_timer;
646 * Inactive timer, responsible for decreasing the active utilization
647 * at the "0-lag time". When a -deadline task blocks, it contributes
648 * to GRUB's active utilization until the "0-lag time", hence a
649 * timer is needed to decrease the active utilization at the correct
652 struct hrtimer inactive_timer;
654 #ifdef CONFIG_RT_MUTEXES
656 * Priority Inheritance. When a DEADLINE scheduling entity is boosted
657 * pi_se points to the donor, otherwise points to the dl_se it belongs
658 * to (the original one/itself).
660 struct sched_dl_entity *pi_se;
664 #ifdef CONFIG_UCLAMP_TASK
665 /* Number of utilization clamp buckets (shorter alias) */
666 #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT
669 * Utilization clamp for a scheduling entity
670 * @value: clamp value "assigned" to a se
671 * @bucket_id: bucket index corresponding to the "assigned" value
672 * @active: the se is currently refcounted in a rq's bucket
673 * @user_defined: the requested clamp value comes from user-space
675 * The bucket_id is the index of the clamp bucket matching the clamp value
676 * which is pre-computed and stored to avoid expensive integer divisions from
679 * The active bit is set whenever a task has got an "effective" value assigned,
680 * which can be different from the clamp value "requested" from user-space.
681 * This allows to know a task is refcounted in the rq's bucket corresponding
682 * to the "effective" bucket_id.
684 * The user_defined bit is set whenever a task has got a task-specific clamp
685 * value requested from userspace, i.e. the system defaults apply to this task
686 * just as a restriction. This allows to relax default clamps when a less
687 * restrictive task-specific value has been requested, thus allowing to
688 * implement a "nice" semantic. For example, a task running with a 20%
689 * default boost can still drop its own boosting to 0%.
692 unsigned int value : bits_per(SCHED_CAPACITY_SCALE);
693 unsigned int bucket_id : bits_per(UCLAMP_BUCKETS);
694 unsigned int active : 1;
695 unsigned int user_defined : 1;
697 #endif /* CONFIG_UCLAMP_TASK */
703 u8 exp_hint; /* Hint for performance. */
704 u8 need_mb; /* Readers need smp_mb(). */
706 u32 s; /* Set of bits. */
709 enum perf_event_task_context {
710 perf_invalid_context = -1,
713 perf_nr_task_contexts,
717 struct wake_q_node *next;
721 #ifdef CONFIG_KMAP_LOCAL
723 pte_t pteval[KM_MAX_IDX];
728 #ifdef CONFIG_THREAD_INFO_IN_TASK
730 * For reasons of header soup (see current_thread_info()), this
731 * must be the first element of task_struct.
733 struct thread_info thread_info;
735 unsigned int __state;
737 #ifdef CONFIG_PREEMPT_RT
738 /* saved state for "spinlock sleepers" */
739 unsigned int saved_state;
743 * This begins the randomizable portion of task_struct. Only
744 * scheduling-critical items should be added above here.
746 randomized_struct_fields_start
750 /* Per task flags (PF_*), defined further below: */
756 struct __call_single_node wake_entry;
757 unsigned int wakee_flips;
758 unsigned long wakee_flip_decay_ts;
759 struct task_struct *last_wakee;
762 * recent_used_cpu is initially set as the last CPU used by a task
763 * that wakes affine another task. Waker/wakee relationships can
764 * push tasks around a CPU where each wakeup moves to the next one.
765 * Tracking a recently used CPU allows a quick search for a recently
766 * used CPU that may be idle.
776 unsigned int rt_priority;
778 struct sched_entity se;
779 struct sched_rt_entity rt;
780 struct sched_dl_entity dl;
781 const struct sched_class *sched_class;
783 #ifdef CONFIG_SCHED_CORE
784 struct rb_node core_node;
785 unsigned long core_cookie;
786 unsigned int core_occupation;
789 #ifdef CONFIG_CGROUP_SCHED
790 struct task_group *sched_task_group;
793 #ifdef CONFIG_UCLAMP_TASK
795 * Clamp values requested for a scheduling entity.
796 * Must be updated with task_rq_lock() held.
798 struct uclamp_se uclamp_req[UCLAMP_CNT];
800 * Effective clamp values used for a scheduling entity.
801 * Must be updated with task_rq_lock() held.
803 struct uclamp_se uclamp[UCLAMP_CNT];
806 struct sched_statistics stats;
808 #ifdef CONFIG_PREEMPT_NOTIFIERS
809 /* List of struct preempt_notifier: */
810 struct hlist_head preempt_notifiers;
813 #ifdef CONFIG_BLK_DEV_IO_TRACE
814 unsigned int btrace_seq;
819 const cpumask_t *cpus_ptr;
820 cpumask_t *user_cpus_ptr;
822 void *migration_pending;
824 unsigned short migration_disabled;
826 unsigned short migration_flags;
828 #ifdef CONFIG_PREEMPT_RCU
829 int rcu_read_lock_nesting;
830 union rcu_special rcu_read_unlock_special;
831 struct list_head rcu_node_entry;
832 struct rcu_node *rcu_blocked_node;
833 #endif /* #ifdef CONFIG_PREEMPT_RCU */
835 #ifdef CONFIG_TASKS_RCU
836 unsigned long rcu_tasks_nvcsw;
837 u8 rcu_tasks_holdout;
839 int rcu_tasks_idle_cpu;
840 struct list_head rcu_tasks_holdout_list;
841 #endif /* #ifdef CONFIG_TASKS_RCU */
843 #ifdef CONFIG_TASKS_TRACE_RCU
844 int trc_reader_nesting;
846 union rcu_special trc_reader_special;
847 struct list_head trc_holdout_list;
848 struct list_head trc_blkd_node;
850 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
852 struct sched_info sched_info;
854 struct list_head tasks;
856 struct plist_node pushable_tasks;
857 struct rb_node pushable_dl_tasks;
860 struct mm_struct *mm;
861 struct mm_struct *active_mm;
863 /* Per-thread vma caching: */
864 struct vmacache vmacache;
866 #ifdef SPLIT_RSS_COUNTING
867 struct task_rss_stat rss_stat;
872 /* The signal sent when the parent dies: */
874 /* JOBCTL_*, siglock protected: */
875 unsigned long jobctl;
877 /* Used for emulating ABI behavior of previous Linux versions: */
878 unsigned int personality;
880 /* Scheduler bits, serialized by scheduler locks: */
881 unsigned sched_reset_on_fork:1;
882 unsigned sched_contributes_to_load:1;
883 unsigned sched_migrated:1;
885 unsigned sched_psi_wake_requeue:1;
888 /* Force alignment to the next boundary: */
891 /* Unserialized, strictly 'current' */
894 * This field must not be in the scheduler word above due to wakelist
895 * queueing no longer being serialized by p->on_cpu. However:
898 * schedule() if (p->on_rq && ..) // false
899 * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true
900 * deactivate_task() ttwu_queue_wakelist())
901 * p->on_rq = 0; p->sched_remote_wakeup = Y;
903 * guarantees all stores of 'current' are visible before
904 * ->sched_remote_wakeup gets used, so it can be in this word.
906 unsigned sched_remote_wakeup:1;
908 /* Bit to tell LSMs we're in execve(): */
909 unsigned in_execve:1;
910 unsigned in_iowait:1;
911 #ifndef TIF_RESTORE_SIGMASK
912 unsigned restore_sigmask:1;
915 unsigned in_user_fault:1;
917 #ifdef CONFIG_COMPAT_BRK
918 unsigned brk_randomized:1;
920 #ifdef CONFIG_CGROUPS
921 /* disallow userland-initiated cgroup migration */
922 unsigned no_cgroup_migration:1;
923 /* task is frozen/stopped (used by the cgroup freezer) */
926 #ifdef CONFIG_BLK_CGROUP
927 unsigned use_memdelay:1;
930 /* Stalled due to lack of memory */
931 unsigned in_memstall:1;
933 #ifdef CONFIG_PAGE_OWNER
934 /* Used by page_owner=on to detect recursion in page tracking. */
935 unsigned in_page_owner:1;
937 #ifdef CONFIG_EVENTFD
938 /* Recursion prevention for eventfd_signal() */
939 unsigned in_eventfd_signal:1;
941 #ifdef CONFIG_IOMMU_SVA
942 unsigned pasid_activated:1;
944 #ifdef CONFIG_CPU_SUP_INTEL
945 unsigned reported_split_lock:1;
948 unsigned long atomic_flags; /* Flags requiring atomic access. */
950 struct restart_block restart_block;
955 #ifdef CONFIG_STACKPROTECTOR
956 /* Canary value for the -fstack-protector GCC feature: */
957 unsigned long stack_canary;
960 * Pointers to the (original) parent process, youngest child, younger sibling,
961 * older sibling, respectively. (p->father can be replaced with
962 * p->real_parent->pid)
965 /* Real parent process: */
966 struct task_struct __rcu *real_parent;
968 /* Recipient of SIGCHLD, wait4() reports: */
969 struct task_struct __rcu *parent;
972 * Children/sibling form the list of natural children:
974 struct list_head children;
975 struct list_head sibling;
976 struct task_struct *group_leader;
979 * 'ptraced' is the list of tasks this task is using ptrace() on.
981 * This includes both natural children and PTRACE_ATTACH targets.
982 * 'ptrace_entry' is this task's link on the p->parent->ptraced list.
984 struct list_head ptraced;
985 struct list_head ptrace_entry;
987 /* PID/PID hash table linkage. */
988 struct pid *thread_pid;
989 struct hlist_node pid_links[PIDTYPE_MAX];
990 struct list_head thread_group;
991 struct list_head thread_node;
993 struct completion *vfork_done;
995 /* CLONE_CHILD_SETTID: */
996 int __user *set_child_tid;
998 /* CLONE_CHILD_CLEARTID: */
999 int __user *clear_child_tid;
1001 /* PF_KTHREAD | PF_IO_WORKER */
1002 void *worker_private;
1006 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1011 struct prev_cputime prev_cputime;
1012 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1016 #ifdef CONFIG_NO_HZ_FULL
1017 atomic_t tick_dep_mask;
1019 /* Context switch counts: */
1020 unsigned long nvcsw;
1021 unsigned long nivcsw;
1023 /* Monotonic time in nsecs: */
1026 /* Boot based time in nsecs: */
1029 /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
1030 unsigned long min_flt;
1031 unsigned long maj_flt;
1033 /* Empty if CONFIG_POSIX_CPUTIMERS=n */
1034 struct posix_cputimers posix_cputimers;
1036 #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
1037 struct posix_cputimers_work posix_cputimers_work;
1040 /* Process credentials: */
1042 /* Tracer's credentials at attach: */
1043 const struct cred __rcu *ptracer_cred;
1045 /* Objective and real subjective task credentials (COW): */
1046 const struct cred __rcu *real_cred;
1048 /* Effective (overridable) subjective task credentials (COW): */
1049 const struct cred __rcu *cred;
1052 /* Cached requested key. */
1053 struct key *cached_requested_key;
1057 * executable name, excluding path.
1059 * - normally initialized setup_new_exec()
1060 * - access it with [gs]et_task_comm()
1061 * - lock it with task_lock()
1063 char comm[TASK_COMM_LEN];
1065 struct nameidata *nameidata;
1067 #ifdef CONFIG_SYSVIPC
1068 struct sysv_sem sysvsem;
1069 struct sysv_shm sysvshm;
1071 #ifdef CONFIG_DETECT_HUNG_TASK
1072 unsigned long last_switch_count;
1073 unsigned long last_switch_time;
1075 /* Filesystem information: */
1076 struct fs_struct *fs;
1078 /* Open file information: */
1079 struct files_struct *files;
1081 #ifdef CONFIG_IO_URING
1082 struct io_uring_task *io_uring;
1086 struct nsproxy *nsproxy;
1088 /* Signal handlers: */
1089 struct signal_struct *signal;
1090 struct sighand_struct __rcu *sighand;
1092 sigset_t real_blocked;
1093 /* Restored if set_restore_sigmask() was used: */
1094 sigset_t saved_sigmask;
1095 struct sigpending pending;
1096 unsigned long sas_ss_sp;
1098 unsigned int sas_ss_flags;
1100 struct callback_head *task_works;
1103 #ifdef CONFIG_AUDITSYSCALL
1104 struct audit_context *audit_context;
1107 unsigned int sessionid;
1109 struct seccomp seccomp;
1110 struct syscall_user_dispatch syscall_dispatch;
1112 /* Thread group tracking: */
1116 /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
1117 spinlock_t alloc_lock;
1119 /* Protection of the PI data structures: */
1120 raw_spinlock_t pi_lock;
1122 struct wake_q_node wake_q;
1124 #ifdef CONFIG_RT_MUTEXES
1125 /* PI waiters blocked on a rt_mutex held by this task: */
1126 struct rb_root_cached pi_waiters;
1127 /* Updated under owner's pi_lock and rq lock */
1128 struct task_struct *pi_top_task;
1129 /* Deadlock detection and priority inheritance handling: */
1130 struct rt_mutex_waiter *pi_blocked_on;
1133 #ifdef CONFIG_DEBUG_MUTEXES
1134 /* Mutex deadlock detection: */
1135 struct mutex_waiter *blocked_on;
1138 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1139 int non_block_count;
1142 #ifdef CONFIG_TRACE_IRQFLAGS
1143 struct irqtrace_events irqtrace;
1144 unsigned int hardirq_threaded;
1145 u64 hardirq_chain_key;
1146 int softirqs_enabled;
1147 int softirq_context;
1150 #ifdef CONFIG_PREEMPT_RT
1151 int softirq_disable_cnt;
1154 #ifdef CONFIG_LOCKDEP
1155 # define MAX_LOCK_DEPTH 48UL
1158 unsigned int lockdep_recursion;
1159 struct held_lock held_locks[MAX_LOCK_DEPTH];
1162 #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
1163 unsigned int in_ubsan;
1166 /* Journalling filesystem info: */
1169 /* Stacked block device info: */
1170 struct bio_list *bio_list;
1172 /* Stack plugging: */
1173 struct blk_plug *plug;
1176 struct reclaim_state *reclaim_state;
1178 struct backing_dev_info *backing_dev_info;
1180 struct io_context *io_context;
1182 #ifdef CONFIG_COMPACTION
1183 struct capture_control *capture_control;
1186 unsigned long ptrace_message;
1187 kernel_siginfo_t *last_siginfo;
1189 struct task_io_accounting ioac;
1191 /* Pressure stall state */
1192 unsigned int psi_flags;
1194 #ifdef CONFIG_TASK_XACCT
1195 /* Accumulated RSS usage: */
1197 /* Accumulated virtual memory usage: */
1199 /* stime + utime since last update: */
1202 #ifdef CONFIG_CPUSETS
1203 /* Protected by ->alloc_lock: */
1204 nodemask_t mems_allowed;
1205 /* Sequence number to catch updates: */
1206 seqcount_spinlock_t mems_allowed_seq;
1207 int cpuset_mem_spread_rotor;
1208 int cpuset_slab_spread_rotor;
1210 #ifdef CONFIG_CGROUPS
1211 /* Control Group info protected by css_set_lock: */
1212 struct css_set __rcu *cgroups;
1213 /* cg_list protected by css_set_lock and tsk->alloc_lock: */
1214 struct list_head cg_list;
1216 #ifdef CONFIG_X86_CPU_RESCTRL
1221 struct robust_list_head __user *robust_list;
1222 #ifdef CONFIG_COMPAT
1223 struct compat_robust_list_head __user *compat_robust_list;
1225 struct list_head pi_state_list;
1226 struct futex_pi_state *pi_state_cache;
1227 struct mutex futex_exit_mutex;
1228 unsigned int futex_state;
1230 #ifdef CONFIG_PERF_EVENTS
1231 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1232 struct mutex perf_event_mutex;
1233 struct list_head perf_event_list;
1235 #ifdef CONFIG_DEBUG_PREEMPT
1236 unsigned long preempt_disable_ip;
1239 /* Protected by alloc_lock: */
1240 struct mempolicy *mempolicy;
1242 short pref_node_fork;
1244 #ifdef CONFIG_NUMA_BALANCING
1246 unsigned int numa_scan_period;
1247 unsigned int numa_scan_period_max;
1248 int numa_preferred_nid;
1249 unsigned long numa_migrate_retry;
1250 /* Migration stamp: */
1252 u64 last_task_numa_placement;
1253 u64 last_sum_exec_runtime;
1254 struct callback_head numa_work;
1257 * This pointer is only modified for current in syscall and
1258 * pagefault context (and for tasks being destroyed), so it can be read
1259 * from any of the following contexts:
1260 * - RCU read-side critical section
1261 * - current->numa_group from everywhere
1262 * - task's runqueue locked, task not running
1264 struct numa_group __rcu *numa_group;
1267 * numa_faults is an array split into four regions:
1268 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1269 * in this precise order.
1271 * faults_memory: Exponential decaying average of faults on a per-node
1272 * basis. Scheduling placement decisions are made based on these
1273 * counts. The values remain static for the duration of a PTE scan.
1274 * faults_cpu: Track the nodes the process was running on when a NUMA
1275 * hinting fault was incurred.
1276 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1277 * during the current scan window. When the scan completes, the counts
1278 * in faults_memory and faults_cpu decay and these values are copied.
1280 unsigned long *numa_faults;
1281 unsigned long total_numa_faults;
1284 * numa_faults_locality tracks if faults recorded during the last
1285 * scan window were remote/local or failed to migrate. The task scan
1286 * period is adapted based on the locality of the faults with different
1287 * weights depending on whether they were shared or private faults
1289 unsigned long numa_faults_locality[3];
1291 unsigned long numa_pages_migrated;
1292 #endif /* CONFIG_NUMA_BALANCING */
1295 struct rseq __user *rseq;
1298 * RmW on rseq_event_mask must be performed atomically
1299 * with respect to preemption.
1301 unsigned long rseq_event_mask;
1304 struct tlbflush_unmap_batch tlb_ubc;
1307 refcount_t rcu_users;
1308 struct rcu_head rcu;
1311 /* Cache last used pipe for splice(): */
1312 struct pipe_inode_info *splice_pipe;
1314 struct page_frag task_frag;
1316 #ifdef CONFIG_TASK_DELAY_ACCT
1317 struct task_delay_info *delays;
1320 #ifdef CONFIG_FAULT_INJECTION
1322 unsigned int fail_nth;
1325 * When (nr_dirtied >= nr_dirtied_pause), it's time to call
1326 * balance_dirty_pages() for a dirty throttling pause:
1329 int nr_dirtied_pause;
1330 /* Start of a write-and-pause period: */
1331 unsigned long dirty_paused_when;
1333 #ifdef CONFIG_LATENCYTOP
1334 int latency_record_count;
1335 struct latency_record latency_record[LT_SAVECOUNT];
1338 * Time slack values; these are used to round up poll() and
1339 * select() etc timeout values. These are in nanoseconds.
1342 u64 default_timer_slack_ns;
1344 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
1345 unsigned int kasan_depth;
1349 struct kcsan_ctx kcsan_ctx;
1350 #ifdef CONFIG_TRACE_IRQFLAGS
1351 struct irqtrace_events kcsan_save_irqtrace;
1353 #ifdef CONFIG_KCSAN_WEAK_MEMORY
1354 int kcsan_stack_depth;
1358 #if IS_ENABLED(CONFIG_KUNIT)
1359 struct kunit *kunit_test;
1362 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1363 /* Index of current stored address in ret_stack: */
1367 /* Stack of return addresses for return function tracing: */
1368 struct ftrace_ret_stack *ret_stack;
1370 /* Timestamp for last schedule: */
1371 unsigned long long ftrace_timestamp;
1374 * Number of functions that haven't been traced
1375 * because of depth overrun:
1377 atomic_t trace_overrun;
1379 /* Pause tracing: */
1380 atomic_t tracing_graph_pause;
1383 #ifdef CONFIG_TRACING
1384 /* State flags for use by tracers: */
1385 unsigned long trace;
1387 /* Bitmask and counter of trace recursion: */
1388 unsigned long trace_recursion;
1389 #endif /* CONFIG_TRACING */
1392 /* See kernel/kcov.c for more details. */
1394 /* Coverage collection mode enabled for this task (0 if disabled): */
1395 unsigned int kcov_mode;
1397 /* Size of the kcov_area: */
1398 unsigned int kcov_size;
1400 /* Buffer for coverage collection: */
1403 /* KCOV descriptor wired with this task or NULL: */
1406 /* KCOV common handle for remote coverage collection: */
1409 /* KCOV sequence number: */
1412 /* Collect coverage from softirq context: */
1413 unsigned int kcov_softirq;
1417 struct mem_cgroup *memcg_in_oom;
1418 gfp_t memcg_oom_gfp_mask;
1419 int memcg_oom_order;
1421 /* Number of pages to reclaim on returning to userland: */
1422 unsigned int memcg_nr_pages_over_high;
1424 /* Used by memcontrol for targeted memcg charge: */
1425 struct mem_cgroup *active_memcg;
1428 #ifdef CONFIG_BLK_CGROUP
1429 struct request_queue *throttle_queue;
1432 #ifdef CONFIG_UPROBES
1433 struct uprobe_task *utask;
1435 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1436 unsigned int sequential_io;
1437 unsigned int sequential_io_avg;
1439 struct kmap_ctrl kmap_ctrl;
1440 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1441 unsigned long task_state_change;
1442 # ifdef CONFIG_PREEMPT_RT
1443 unsigned long saved_state_change;
1446 int pagefault_disabled;
1448 struct task_struct *oom_reaper_list;
1449 struct timer_list oom_reaper_timer;
1451 #ifdef CONFIG_VMAP_STACK
1452 struct vm_struct *stack_vm_area;
1454 #ifdef CONFIG_THREAD_INFO_IN_TASK
1455 /* A live task holds one reference: */
1456 refcount_t stack_refcount;
1458 #ifdef CONFIG_LIVEPATCH
1461 #ifdef CONFIG_SECURITY
1462 /* Used by LSM modules for access restriction: */
1465 #ifdef CONFIG_BPF_SYSCALL
1466 /* Used by BPF task local storage */
1467 struct bpf_local_storage __rcu *bpf_storage;
1468 /* Used for BPF run context */
1469 struct bpf_run_ctx *bpf_ctx;
1472 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
1473 unsigned long lowest_stack;
1474 unsigned long prev_lowest_stack;
1477 #ifdef CONFIG_X86_MCE
1478 void __user *mce_vaddr;
1483 __mce_reserved : 62;
1484 struct callback_head mce_kill_me;
1488 #ifdef CONFIG_KRETPROBES
1489 struct llist_head kretprobe_instances;
1491 #ifdef CONFIG_RETHOOK
1492 struct llist_head rethooks;
1495 #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
1497 * If L1D flush is supported on mm context switch
1498 * then we use this callback head to queue kill work
1499 * to kill tasks that are not running on SMT disabled
1502 struct callback_head l1d_flush_kill;
1507 * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS.
1508 * If we find justification for more monitors, we can think
1509 * about adding more or developing a dynamic method. So far,
1510 * none of these are justified.
1512 union rv_task_monitor rv[RV_PER_TASK_MONITORS];
1516 * New fields for task_struct should be added above here, so that
1517 * they are included in the randomized portion of task_struct.
1519 randomized_struct_fields_end
1521 /* CPU-specific state of this task: */
1522 struct thread_struct thread;
1525 * WARNING: on x86, 'thread_struct' contains a variable-sized
1526 * structure. It *MUST* be at the end of 'task_struct'.
1528 * Do not put anything below here!
1532 static inline struct pid *task_pid(struct task_struct *task)
1534 return task->thread_pid;
1538 * the helpers to get the task's different pids as they are seen
1539 * from various namespaces
1541 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1542 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1544 * task_xid_nr_ns() : id seen from the ns specified;
1546 * see also pid_nr() etc in include/linux/pid.h
1548 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);
1550 static inline pid_t task_pid_nr(struct task_struct *tsk)
1555 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1557 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1560 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1562 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1566 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1572 * pid_alive - check that a task structure is not stale
1573 * @p: Task structure to be checked.
1575 * Test if a process is not yet dead (at most zombie state)
1576 * If pid_alive fails, then pointers within the task structure
1577 * can be stale and must not be dereferenced.
1579 * Return: 1 if the process is alive. 0 otherwise.
1581 static inline int pid_alive(const struct task_struct *p)
1583 return p->thread_pid != NULL;
1586 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1588 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1591 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1593 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1597 static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1599 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1602 static inline pid_t task_session_vnr(struct task_struct *tsk)
1604 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1607 static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1609 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
1612 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1614 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
1617 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
1623 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
1629 static inline pid_t task_ppid_nr(const struct task_struct *tsk)
1631 return task_ppid_nr_ns(tsk, &init_pid_ns);
1634 /* Obsolete, do not use: */
1635 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1637 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1640 #define TASK_REPORT_IDLE (TASK_REPORT + 1)
1641 #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1)
1643 static inline unsigned int __task_state_index(unsigned int tsk_state,
1644 unsigned int tsk_exit_state)
1646 unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT;
1648 BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
1650 if (tsk_state == TASK_IDLE)
1651 state = TASK_REPORT_IDLE;
1654 * We're lying here, but rather than expose a completely new task state
1655 * to userspace, we can make this appear as if the task has gone through
1656 * a regular rt_mutex_lock() call.
1658 if (tsk_state == TASK_RTLOCK_WAIT)
1659 state = TASK_UNINTERRUPTIBLE;
1664 static inline unsigned int task_state_index(struct task_struct *tsk)
1666 return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state);
1669 static inline char task_index_to_char(unsigned int state)
1671 static const char state_char[] = "RSDTtXZPI";
1673 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
1675 return state_char[state];
1678 static inline char task_state_to_char(struct task_struct *tsk)
1680 return task_index_to_char(task_state_index(tsk));
1684 * is_global_init - check if a task structure is init. Since init
1685 * is free to have sub-threads we need to check tgid.
1686 * @tsk: Task structure to be checked.
1688 * Check if a task structure is the first user space task the kernel created.
1690 * Return: 1 if the task structure is init. 0 otherwise.
1692 static inline int is_global_init(struct task_struct *tsk)
1694 return task_tgid_nr(tsk) == 1;
1697 extern struct pid *cad_pid;
1702 #define PF_VCPU 0x00000001 /* I'm a virtual CPU */
1703 #define PF_IDLE 0x00000002 /* I am an IDLE thread */
1704 #define PF_EXITING 0x00000004 /* Getting shut down */
1705 #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */
1706 #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */
1707 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1708 #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
1709 #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */
1710 #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */
1711 #define PF_DUMPCORE 0x00000200 /* Dumped core */
1712 #define PF_SIGNALED 0x00000400 /* Killed by a signal */
1713 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1714 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */
1715 #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */
1716 #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */
1717 #define PF_FROZEN 0x00010000 /* Frozen for system suspend */
1718 #define PF_KSWAPD 0x00020000 /* I am kswapd */
1719 #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */
1720 #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */
1721 #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to,
1722 * I am cleaning dirty pages from some other bdi. */
1723 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1724 #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
1725 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
1726 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1727 #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */
1728 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1729 #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
1732 * Only the _current_ task can read/write to tsk->flags, but other
1733 * tasks can access tsk->flags in readonly mode for example
1734 * with tsk_used_math (like during threaded core dumping).
1735 * There is however an exception to this rule during ptrace
1736 * or during fork: the ptracer task is allowed to write to the
1737 * child->flags of its traced child (same goes for fork, the parent
1738 * can write to the child->flags), because we're guaranteed the
1739 * child is not running and in turn not changing child->flags
1740 * at the same time the parent does it.
1742 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1743 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1744 #define clear_used_math() clear_stopped_child_used_math(current)
1745 #define set_used_math() set_stopped_child_used_math(current)
1747 #define conditional_stopped_child_used_math(condition, child) \
1748 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1750 #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current)
1752 #define copy_to_stopped_child_used_math(child) \
1753 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1755 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1756 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1757 #define used_math() tsk_used_math(current)
1759 static __always_inline bool is_percpu_thread(void)
1762 return (current->flags & PF_NO_SETAFFINITY) &&
1763 (current->nr_cpus_allowed == 1);
1769 /* Per-process atomic flags. */
1770 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
1771 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
1772 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
1773 #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */
1774 #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/
1775 #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */
1776 #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */
1777 #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */
1779 #define TASK_PFA_TEST(name, func) \
1780 static inline bool task_##func(struct task_struct *p) \
1781 { return test_bit(PFA_##name, &p->atomic_flags); }
1783 #define TASK_PFA_SET(name, func) \
1784 static inline void task_set_##func(struct task_struct *p) \
1785 { set_bit(PFA_##name, &p->atomic_flags); }
1787 #define TASK_PFA_CLEAR(name, func) \
1788 static inline void task_clear_##func(struct task_struct *p) \
1789 { clear_bit(PFA_##name, &p->atomic_flags); }
1791 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
1792 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
1794 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
1795 TASK_PFA_SET(SPREAD_PAGE, spread_page)
1796 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
1798 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
1799 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
1800 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
1802 TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
1803 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
1804 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
1806 TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1807 TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1808 TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1810 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1811 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1813 TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable)
1814 TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable)
1815 TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable)
1817 TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1818 TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1821 current_restore_flags(unsigned long orig_flags, unsigned long flags)
1823 current->flags &= ~flags;
1824 current->flags |= orig_flags & flags;
1827 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
1828 extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed);
1830 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
1831 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
1832 extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
1833 extern void release_user_cpus_ptr(struct task_struct *p);
1834 extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask);
1835 extern void force_compatible_cpus_allowed_ptr(struct task_struct *p);
1836 extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p);
1838 static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
1841 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
1843 if (!cpumask_test_cpu(0, new_mask))
1847 static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node)
1849 if (src->user_cpus_ptr)
1853 static inline void release_user_cpus_ptr(struct task_struct *p)
1855 WARN_ON(p->user_cpus_ptr);
1858 static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask)
1864 extern int yield_to(struct task_struct *p, bool preempt);
1865 extern void set_user_nice(struct task_struct *p, long nice);
1866 extern int task_prio(const struct task_struct *p);
1869 * task_nice - return the nice value of a given task.
1870 * @p: the task in question.
1872 * Return: The nice value [ -20 ... 0 ... 19 ].
1874 static inline int task_nice(const struct task_struct *p)
1876 return PRIO_TO_NICE((p)->static_prio);
1879 extern int can_nice(const struct task_struct *p, const int nice);
1880 extern int task_curr(const struct task_struct *p);
1881 extern int idle_cpu(int cpu);
1882 extern int available_idle_cpu(int cpu);
1883 extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
1884 extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
1885 extern void sched_set_fifo(struct task_struct *p);
1886 extern void sched_set_fifo_low(struct task_struct *p);
1887 extern void sched_set_normal(struct task_struct *p, int nice);
1888 extern int sched_setattr(struct task_struct *, const struct sched_attr *);
1889 extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
1890 extern struct task_struct *idle_task(int cpu);
1893 * is_idle_task - is the specified task an idle task?
1894 * @p: the task in question.
1896 * Return: 1 if @p is an idle task. 0 otherwise.
1898 static __always_inline bool is_idle_task(const struct task_struct *p)
1900 return !!(p->flags & PF_IDLE);
1903 extern struct task_struct *curr_task(int cpu);
1904 extern void ia64_set_curr_task(int cpu, struct task_struct *p);
1908 union thread_union {
1909 #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK
1910 struct task_struct task;
1912 #ifndef CONFIG_THREAD_INFO_IN_TASK
1913 struct thread_info thread_info;
1915 unsigned long stack[THREAD_SIZE/sizeof(long)];
1918 #ifndef CONFIG_THREAD_INFO_IN_TASK
1919 extern struct thread_info init_thread_info;
1922 extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)];
1924 #ifdef CONFIG_THREAD_INFO_IN_TASK
1925 # define task_thread_info(task) (&(task)->thread_info)
1926 #elif !defined(__HAVE_THREAD_FUNCTIONS)
1927 # define task_thread_info(task) ((struct thread_info *)(task)->stack)
1931 * find a task by one of its numerical ids
1933 * find_task_by_pid_ns():
1934 * finds a task by its pid in the specified namespace
1935 * find_task_by_vpid():
1936 * finds a task by its virtual pid
1938 * see also find_vpid() etc in include/linux/pid.h
1941 extern struct task_struct *find_task_by_vpid(pid_t nr);
1942 extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
1945 * find a task by its virtual pid and get the task struct
1947 extern struct task_struct *find_get_task_by_vpid(pid_t nr);
1949 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1950 extern int wake_up_process(struct task_struct *tsk);
1951 extern void wake_up_new_task(struct task_struct *tsk);
1954 extern void kick_process(struct task_struct *tsk);
1956 static inline void kick_process(struct task_struct *tsk) { }
1959 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
1961 static inline void set_task_comm(struct task_struct *tsk, const char *from)
1963 __set_task_comm(tsk, from, false);
1966 extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk);
1967 #define get_task_comm(buf, tsk) ({ \
1968 BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \
1969 __get_task_comm(buf, sizeof(buf), tsk); \
1973 static __always_inline void scheduler_ipi(void)
1976 * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting
1977 * TIF_NEED_RESCHED remotely (for the first time) will also send
1980 preempt_fold_need_resched();
1982 extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
1984 static inline void scheduler_ipi(void) { }
1985 static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state)
1992 * Set thread flags in other task's structures.
1993 * See asm/thread_info.h for TIF_xxxx flags available:
1995 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1997 set_ti_thread_flag(task_thread_info(tsk), flag);
2000 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2002 clear_ti_thread_flag(task_thread_info(tsk), flag);
2005 static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
2008 update_ti_thread_flag(task_thread_info(tsk), flag, value);
2011 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2013 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2016 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2018 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2021 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2023 return test_ti_thread_flag(task_thread_info(tsk), flag);
2026 static inline void set_tsk_need_resched(struct task_struct *tsk)
2028 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2031 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2033 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2036 static inline int test_tsk_need_resched(struct task_struct *tsk)
2038 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2042 * cond_resched() and cond_resched_lock(): latency reduction via
2043 * explicit rescheduling in places that are safe. The return
2044 * value indicates whether a reschedule was done in fact.
2045 * cond_resched_lock() will drop the spinlock before scheduling,
2047 #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
2048 extern int __cond_resched(void);
2050 #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)
2052 DECLARE_STATIC_CALL(cond_resched, __cond_resched);
2054 static __always_inline int _cond_resched(void)
2056 return static_call_mod(cond_resched)();
2059 #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
2060 extern int dynamic_cond_resched(void);
2062 static __always_inline int _cond_resched(void)
2064 return dynamic_cond_resched();
2069 static inline int _cond_resched(void)
2071 return __cond_resched();
2074 #endif /* CONFIG_PREEMPT_DYNAMIC */
2078 static inline int _cond_resched(void) { return 0; }
2080 #endif /* !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) */
2082 #define cond_resched() ({ \
2083 __might_resched(__FILE__, __LINE__, 0); \
2087 extern int __cond_resched_lock(spinlock_t *lock);
2088 extern int __cond_resched_rwlock_read(rwlock_t *lock);
2089 extern int __cond_resched_rwlock_write(rwlock_t *lock);
2091 #define MIGHT_RESCHED_RCU_SHIFT 8
2092 #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1)
2094 #ifndef CONFIG_PREEMPT_RT
2096 * Non RT kernels have an elevated preempt count due to the held lock,
2097 * but are not allowed to be inside a RCU read side critical section
2099 # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET
2102 * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in
2103 * cond_resched*lock() has to take that into account because it checks for
2104 * preempt_count() and rcu_preempt_depth().
2106 # define PREEMPT_LOCK_RESCHED_OFFSETS \
2107 (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT))
2110 #define cond_resched_lock(lock) ({ \
2111 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2112 __cond_resched_lock(lock); \
2115 #define cond_resched_rwlock_read(lock) ({ \
2116 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2117 __cond_resched_rwlock_read(lock); \
2120 #define cond_resched_rwlock_write(lock) ({ \
2121 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2122 __cond_resched_rwlock_write(lock); \
2125 static inline void cond_resched_rcu(void)
2127 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2134 #ifdef CONFIG_PREEMPT_DYNAMIC
2136 extern bool preempt_model_none(void);
2137 extern bool preempt_model_voluntary(void);
2138 extern bool preempt_model_full(void);
2142 static inline bool preempt_model_none(void)
2144 return IS_ENABLED(CONFIG_PREEMPT_NONE);
2146 static inline bool preempt_model_voluntary(void)
2148 return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY);
2150 static inline bool preempt_model_full(void)
2152 return IS_ENABLED(CONFIG_PREEMPT);
2157 static inline bool preempt_model_rt(void)
2159 return IS_ENABLED(CONFIG_PREEMPT_RT);
2163 * Does the preemption model allow non-cooperative preemption?
2165 * For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with
2166 * CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the
2167 * kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the
2168 * PREEMPT_NONE model.
2170 static inline bool preempt_model_preemptible(void)
2172 return preempt_model_full() || preempt_model_rt();
2176 * Does a critical section need to be broken due to another
2177 * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
2178 * but a general need for low latency)
2180 static inline int spin_needbreak(spinlock_t *lock)
2182 #ifdef CONFIG_PREEMPTION
2183 return spin_is_contended(lock);
2190 * Check if a rwlock is contended.
2191 * Returns non-zero if there is another task waiting on the rwlock.
2192 * Returns zero if the lock is not contended or the system / underlying
2193 * rwlock implementation does not support contention detection.
2194 * Technically does not depend on CONFIG_PREEMPTION, but a general need
2197 static inline int rwlock_needbreak(rwlock_t *lock)
2199 #ifdef CONFIG_PREEMPTION
2200 return rwlock_is_contended(lock);
2206 static __always_inline bool need_resched(void)
2208 return unlikely(tif_need_resched());
2212 * Wrappers for p->thread_info->cpu access. No-op on UP.
2216 static inline unsigned int task_cpu(const struct task_struct *p)
2218 return READ_ONCE(task_thread_info(p)->cpu);
2221 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2225 static inline unsigned int task_cpu(const struct task_struct *p)
2230 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2234 #endif /* CONFIG_SMP */
2236 extern bool sched_task_on_rq(struct task_struct *p);
2237 extern unsigned long get_wchan(struct task_struct *p);
2238 extern struct task_struct *cpu_curr_snapshot(int cpu);
2241 * In order to reduce various lock holder preemption latencies provide an
2242 * interface to see if a vCPU is currently running or not.
2244 * This allows us to terminate optimistic spin loops and block, analogous to
2245 * the native optimistic spin heuristic of testing if the lock owner task is
2248 #ifndef vcpu_is_preempted
2249 static inline bool vcpu_is_preempted(int cpu)
2255 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2256 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2258 #ifndef TASK_SIZE_OF
2259 #define TASK_SIZE_OF(tsk) TASK_SIZE
2263 static inline bool owner_on_cpu(struct task_struct *owner)
2266 * As lock holder preemption issue, we both skip spinning if
2267 * task is not on cpu or its cpu is preempted
2269 return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner));
2272 /* Returns effective CPU energy utilization, as seen by the scheduler */
2273 unsigned long sched_cpu_util(int cpu);
2274 #endif /* CONFIG_SMP */
2279 * Map the event mask on the user-space ABI enum rseq_cs_flags
2280 * for direct mask checks.
2282 enum rseq_event_mask_bits {
2283 RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT,
2284 RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT,
2285 RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT,
2288 enum rseq_event_mask {
2289 RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT),
2290 RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT),
2291 RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT),
2294 static inline void rseq_set_notify_resume(struct task_struct *t)
2297 set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
2300 void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);
2302 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2303 struct pt_regs *regs)
2306 __rseq_handle_notify_resume(ksig, regs);
2309 static inline void rseq_signal_deliver(struct ksignal *ksig,
2310 struct pt_regs *regs)
2313 __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
2315 rseq_handle_notify_resume(ksig, regs);
2318 /* rseq_preempt() requires preemption to be disabled. */
2319 static inline void rseq_preempt(struct task_struct *t)
2321 __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
2322 rseq_set_notify_resume(t);
2325 /* rseq_migrate() requires preemption to be disabled. */
2326 static inline void rseq_migrate(struct task_struct *t)
2328 __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
2329 rseq_set_notify_resume(t);
2333 * If parent process has a registered restartable sequences area, the
2334 * child inherits. Unregister rseq for a clone with CLONE_VM set.
2336 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2338 if (clone_flags & CLONE_VM) {
2341 t->rseq_event_mask = 0;
2343 t->rseq = current->rseq;
2344 t->rseq_sig = current->rseq_sig;
2345 t->rseq_event_mask = current->rseq_event_mask;
2349 static inline void rseq_execve(struct task_struct *t)
2353 t->rseq_event_mask = 0;
2358 static inline void rseq_set_notify_resume(struct task_struct *t)
2361 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2362 struct pt_regs *regs)
2365 static inline void rseq_signal_deliver(struct ksignal *ksig,
2366 struct pt_regs *regs)
2369 static inline void rseq_preempt(struct task_struct *t)
2372 static inline void rseq_migrate(struct task_struct *t)
2375 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2378 static inline void rseq_execve(struct task_struct *t)
2384 #ifdef CONFIG_DEBUG_RSEQ
2386 void rseq_syscall(struct pt_regs *regs);
2390 static inline void rseq_syscall(struct pt_regs *regs)
2396 #ifdef CONFIG_SCHED_CORE
2397 extern void sched_core_free(struct task_struct *tsk);
2398 extern void sched_core_fork(struct task_struct *p);
2399 extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type,
2400 unsigned long uaddr);
2402 static inline void sched_core_free(struct task_struct *tsk) { }
2403 static inline void sched_core_fork(struct task_struct *p) { }
2406 extern void sched_set_stop_task(int cpu, struct task_struct *stop);