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/kmsan_types.h>
18 #include <linux/mutex.h>
19 #include <linux/plist.h>
20 #include <linux/hrtimer.h>
21 #include <linux/irqflags.h>
22 #include <linux/seccomp.h>
23 #include <linux/nodemask.h>
24 #include <linux/rcupdate.h>
25 #include <linux/refcount.h>
26 #include <linux/resource.h>
27 #include <linux/latencytop.h>
28 #include <linux/sched/prio.h>
29 #include <linux/sched/types.h>
30 #include <linux/signal_types.h>
31 #include <linux/syscall_user_dispatch.h>
32 #include <linux/mm_types_task.h>
33 #include <linux/task_io_accounting.h>
34 #include <linux/posix-timers.h>
35 #include <linux/rseq.h>
36 #include <linux/seqlock.h>
37 #include <linux/kcsan.h>
39 #include <linux/livepatch_sched.h>
40 #include <asm/kmap_size.h>
42 /* task_struct member predeclarations (sorted alphabetically): */
46 struct bpf_local_storage;
48 struct capture_control;
51 struct futex_pi_state;
57 struct perf_event_context;
59 struct pipe_inode_info;
62 struct robust_list_head;
68 struct sighand_struct;
70 struct task_delay_info;
75 * Task state bitmask. NOTE! These bits are also
76 * encoded in fs/proc/array.c: get_task_state().
78 * We have two separate sets of flags: task->state
79 * is about runnability, while task->exit_state are
80 * about the task exiting. Confusing, but this way
81 * modifying one set can't modify the other one by
85 /* Used in tsk->state: */
86 #define TASK_RUNNING 0x00000000
87 #define TASK_INTERRUPTIBLE 0x00000001
88 #define TASK_UNINTERRUPTIBLE 0x00000002
89 #define __TASK_STOPPED 0x00000004
90 #define __TASK_TRACED 0x00000008
91 /* Used in tsk->exit_state: */
92 #define EXIT_DEAD 0x00000010
93 #define EXIT_ZOMBIE 0x00000020
94 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
95 /* Used in tsk->state again: */
96 #define TASK_PARKED 0x00000040
97 #define TASK_DEAD 0x00000080
98 #define TASK_WAKEKILL 0x00000100
99 #define TASK_WAKING 0x00000200
100 #define TASK_NOLOAD 0x00000400
101 #define TASK_NEW 0x00000800
102 #define TASK_RTLOCK_WAIT 0x00001000
103 #define TASK_FREEZABLE 0x00002000
104 #define __TASK_FREEZABLE_UNSAFE (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP))
105 #define TASK_FROZEN 0x00008000
106 #define TASK_STATE_MAX 0x00010000
108 #define TASK_ANY (TASK_STATE_MAX-1)
111 * DO NOT ADD ANY NEW USERS !
113 #define TASK_FREEZABLE_UNSAFE (TASK_FREEZABLE | __TASK_FREEZABLE_UNSAFE)
115 /* Convenience macros for the sake of set_current_state: */
116 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
117 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
118 #define TASK_TRACED __TASK_TRACED
120 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
122 /* Convenience macros for the sake of wake_up(): */
123 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
125 /* get_task_state(): */
126 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
127 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
128 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
131 #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING)
133 #define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
134 #define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
135 #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
138 * Special states are those that do not use the normal wait-loop pattern. See
139 * the comment with set_special_state().
141 #define is_special_task_state(state) \
142 ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))
144 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
145 # define debug_normal_state_change(state_value) \
147 WARN_ON_ONCE(is_special_task_state(state_value)); \
148 current->task_state_change = _THIS_IP_; \
151 # define debug_special_state_change(state_value) \
153 WARN_ON_ONCE(!is_special_task_state(state_value)); \
154 current->task_state_change = _THIS_IP_; \
157 # define debug_rtlock_wait_set_state() \
159 current->saved_state_change = current->task_state_change;\
160 current->task_state_change = _THIS_IP_; \
163 # define debug_rtlock_wait_restore_state() \
165 current->task_state_change = current->saved_state_change;\
169 # define debug_normal_state_change(cond) do { } while (0)
170 # define debug_special_state_change(cond) do { } while (0)
171 # define debug_rtlock_wait_set_state() do { } while (0)
172 # define debug_rtlock_wait_restore_state() do { } while (0)
176 * set_current_state() includes a barrier so that the write of current->state
177 * is correctly serialised wrt the caller's subsequent test of whether to
181 * set_current_state(TASK_UNINTERRUPTIBLE);
187 * __set_current_state(TASK_RUNNING);
189 * If the caller does not need such serialisation (because, for instance, the
190 * CONDITION test and condition change and wakeup are under the same lock) then
191 * use __set_current_state().
193 * The above is typically ordered against the wakeup, which does:
196 * wake_up_state(p, TASK_UNINTERRUPTIBLE);
198 * where wake_up_state()/try_to_wake_up() executes a full memory barrier before
199 * accessing p->state.
201 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
202 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
203 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
205 * However, with slightly different timing the wakeup TASK_RUNNING store can
206 * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
207 * a problem either because that will result in one extra go around the loop
208 * and our @cond test will save the day.
210 * Also see the comments of try_to_wake_up().
212 #define __set_current_state(state_value) \
214 debug_normal_state_change((state_value)); \
215 WRITE_ONCE(current->__state, (state_value)); \
218 #define set_current_state(state_value) \
220 debug_normal_state_change((state_value)); \
221 smp_store_mb(current->__state, (state_value)); \
225 * set_special_state() should be used for those states when the blocking task
226 * can not use the regular condition based wait-loop. In that case we must
227 * serialize against wakeups such that any possible in-flight TASK_RUNNING
228 * stores will not collide with our state change.
230 #define set_special_state(state_value) \
232 unsigned long flags; /* may shadow */ \
234 raw_spin_lock_irqsave(¤t->pi_lock, flags); \
235 debug_special_state_change((state_value)); \
236 WRITE_ONCE(current->__state, (state_value)); \
237 raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \
241 * PREEMPT_RT specific variants for "sleeping" spin/rwlocks
243 * RT's spin/rwlock substitutions are state preserving. The state of the
244 * task when blocking on the lock is saved in task_struct::saved_state and
245 * restored after the lock has been acquired. These operations are
246 * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT
247 * lock related wakeups while the task is blocked on the lock are
248 * redirected to operate on task_struct::saved_state to ensure that these
249 * are not dropped. On restore task_struct::saved_state is set to
250 * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail.
252 * The lock operation looks like this:
254 * current_save_and_set_rtlock_wait_state();
258 * raw_spin_unlock_irq(&lock->wait_lock);
260 * raw_spin_lock_irq(&lock->wait_lock);
261 * set_current_state(TASK_RTLOCK_WAIT);
263 * current_restore_rtlock_saved_state();
265 #define current_save_and_set_rtlock_wait_state() \
267 lockdep_assert_irqs_disabled(); \
268 raw_spin_lock(¤t->pi_lock); \
269 current->saved_state = current->__state; \
270 debug_rtlock_wait_set_state(); \
271 WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \
272 raw_spin_unlock(¤t->pi_lock); \
275 #define current_restore_rtlock_saved_state() \
277 lockdep_assert_irqs_disabled(); \
278 raw_spin_lock(¤t->pi_lock); \
279 debug_rtlock_wait_restore_state(); \
280 WRITE_ONCE(current->__state, current->saved_state); \
281 current->saved_state = TASK_RUNNING; \
282 raw_spin_unlock(¤t->pi_lock); \
285 #define get_current_state() READ_ONCE(current->__state)
288 * Define the task command name length as enum, then it can be visible to
295 extern void scheduler_tick(void);
297 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
299 extern long schedule_timeout(long timeout);
300 extern long schedule_timeout_interruptible(long timeout);
301 extern long schedule_timeout_killable(long timeout);
302 extern long schedule_timeout_uninterruptible(long timeout);
303 extern long schedule_timeout_idle(long timeout);
304 asmlinkage void schedule(void);
305 extern void schedule_preempt_disabled(void);
306 asmlinkage void preempt_schedule_irq(void);
307 #ifdef CONFIG_PREEMPT_RT
308 extern void schedule_rtlock(void);
311 extern int __must_check io_schedule_prepare(void);
312 extern void io_schedule_finish(int token);
313 extern long io_schedule_timeout(long timeout);
314 extern void io_schedule(void);
317 * struct prev_cputime - snapshot of system and user cputime
318 * @utime: time spent in user mode
319 * @stime: time spent in system mode
320 * @lock: protects the above two fields
322 * Stores previous user/system time values such that we can guarantee
325 struct prev_cputime {
326 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
334 /* Task is sleeping or running in a CPU with VTIME inactive: */
338 /* Task runs in kernelspace in a CPU with VTIME active: */
340 /* Task runs in userspace in a CPU with VTIME active: */
342 /* Task runs as guests in a CPU with VTIME active: */
348 unsigned long long starttime;
349 enum vtime_state state;
357 * Utilization clamp constraints.
358 * @UCLAMP_MIN: Minimum utilization
359 * @UCLAMP_MAX: Maximum utilization
360 * @UCLAMP_CNT: Utilization clamp constraints count
369 extern struct root_domain def_root_domain;
370 extern struct mutex sched_domains_mutex;
374 #ifdef CONFIG_SCHED_INFO
375 /* Cumulative counters: */
377 /* # of times we have run on this CPU: */
378 unsigned long pcount;
380 /* Time spent waiting on a runqueue: */
381 unsigned long long run_delay;
385 /* When did we last run on a CPU? */
386 unsigned long long last_arrival;
388 /* When were we last queued to run? */
389 unsigned long long last_queued;
391 #endif /* CONFIG_SCHED_INFO */
395 * Integer metrics need fixed point arithmetic, e.g., sched/fair
396 * has a few: load, load_avg, util_avg, freq, and capacity.
398 * We define a basic fixed point arithmetic range, and then formalize
399 * all these metrics based on that basic range.
401 # define SCHED_FIXEDPOINT_SHIFT 10
402 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
404 /* Increase resolution of cpu_capacity calculations */
405 # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
406 # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
409 unsigned long weight;
414 * struct util_est - Estimation utilization of FAIR tasks
415 * @enqueued: instantaneous estimated utilization of a task/cpu
416 * @ewma: the Exponential Weighted Moving Average (EWMA)
417 * utilization of a task
419 * Support data structure to track an Exponential Weighted Moving Average
420 * (EWMA) of a FAIR task's utilization. New samples are added to the moving
421 * average each time a task completes an activation. Sample's weight is chosen
422 * so that the EWMA will be relatively insensitive to transient changes to the
425 * The enqueued attribute has a slightly different meaning for tasks and cpus:
426 * - task: the task's util_avg at last task dequeue time
427 * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU
428 * Thus, the util_est.enqueued of a task represents the contribution on the
429 * estimated utilization of the CPU where that task is currently enqueued.
431 * Only for tasks we track a moving average of the past instantaneous
432 * estimated utilization. This allows to absorb sporadic drops in utilization
433 * of an otherwise almost periodic task.
435 * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg
436 * updates. When a task is dequeued, its util_est should not be updated if its
437 * util_avg has not been updated in the meantime.
438 * This information is mapped into the MSB bit of util_est.enqueued at dequeue
439 * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg
440 * for a task) it is safe to use MSB.
443 unsigned int enqueued;
445 #define UTIL_EST_WEIGHT_SHIFT 2
446 #define UTIL_AVG_UNCHANGED 0x80000000
447 } __attribute__((__aligned__(sizeof(u64))));
450 * The load/runnable/util_avg accumulates an infinite geometric series
451 * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c).
453 * [load_avg definition]
455 * load_avg = runnable% * scale_load_down(load)
457 * [runnable_avg definition]
459 * runnable_avg = runnable% * SCHED_CAPACITY_SCALE
461 * [util_avg definition]
463 * util_avg = running% * SCHED_CAPACITY_SCALE
465 * where runnable% is the time ratio that a sched_entity is runnable and
466 * running% the time ratio that a sched_entity is running.
468 * For cfs_rq, they are the aggregated values of all runnable and blocked
471 * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU
472 * capacity scaling. The scaling is done through the rq_clock_pelt that is used
473 * for computing those signals (see update_rq_clock_pelt())
475 * N.B., the above ratios (runnable% and running%) themselves are in the
476 * range of [0, 1]. To do fixed point arithmetics, we therefore scale them
477 * to as large a range as necessary. This is for example reflected by
478 * util_avg's SCHED_CAPACITY_SCALE.
482 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
483 * with the highest load (=88761), always runnable on a single cfs_rq,
484 * and should not overflow as the number already hits PID_MAX_LIMIT.
486 * For all other cases (including 32-bit kernels), struct load_weight's
487 * weight will overflow first before we do, because:
489 * Max(load_avg) <= Max(load.weight)
491 * Then it is the load_weight's responsibility to consider overflow
495 u64 last_update_time;
500 unsigned long load_avg;
501 unsigned long runnable_avg;
502 unsigned long util_avg;
503 struct util_est util_est;
504 } ____cacheline_aligned;
506 struct sched_statistics {
507 #ifdef CONFIG_SCHEDSTATS
517 s64 sum_sleep_runtime;
521 s64 sum_block_runtime;
526 u64 nr_migrations_cold;
527 u64 nr_failed_migrations_affine;
528 u64 nr_failed_migrations_running;
529 u64 nr_failed_migrations_hot;
530 u64 nr_forced_migrations;
534 u64 nr_wakeups_migrate;
535 u64 nr_wakeups_local;
536 u64 nr_wakeups_remote;
537 u64 nr_wakeups_affine;
538 u64 nr_wakeups_affine_attempts;
539 u64 nr_wakeups_passive;
542 #ifdef CONFIG_SCHED_CORE
543 u64 core_forceidle_sum;
545 #endif /* CONFIG_SCHEDSTATS */
546 } ____cacheline_aligned;
548 struct sched_entity {
549 /* For load-balancing: */
550 struct load_weight load;
551 struct rb_node run_node;
552 struct list_head group_node;
556 u64 sum_exec_runtime;
558 u64 prev_sum_exec_runtime;
562 #ifdef CONFIG_FAIR_GROUP_SCHED
564 struct sched_entity *parent;
565 /* rq on which this entity is (to be) queued: */
566 struct cfs_rq *cfs_rq;
567 /* rq "owned" by this entity/group: */
569 /* cached value of my_q->h_nr_running */
570 unsigned long runnable_weight;
575 * Per entity load average tracking.
577 * Put into separate cache line so it does not
578 * collide with read-mostly values above.
580 struct sched_avg avg;
584 struct sched_rt_entity {
585 struct list_head run_list;
586 unsigned long timeout;
587 unsigned long watchdog_stamp;
588 unsigned int time_slice;
589 unsigned short on_rq;
590 unsigned short on_list;
592 struct sched_rt_entity *back;
593 #ifdef CONFIG_RT_GROUP_SCHED
594 struct sched_rt_entity *parent;
595 /* rq on which this entity is (to be) queued: */
597 /* rq "owned" by this entity/group: */
600 } __randomize_layout;
602 struct sched_dl_entity {
603 struct rb_node rb_node;
606 * Original scheduling parameters. Copied here from sched_attr
607 * during sched_setattr(), they will remain the same until
608 * the next sched_setattr().
610 u64 dl_runtime; /* Maximum runtime for each instance */
611 u64 dl_deadline; /* Relative deadline of each instance */
612 u64 dl_period; /* Separation of two instances (period) */
613 u64 dl_bw; /* dl_runtime / dl_period */
614 u64 dl_density; /* dl_runtime / dl_deadline */
617 * Actual scheduling parameters. Initialized with the values above,
618 * they are continuously updated during task execution. Note that
619 * the remaining runtime could be < 0 in case we are in overrun.
621 s64 runtime; /* Remaining runtime for this instance */
622 u64 deadline; /* Absolute deadline for this instance */
623 unsigned int flags; /* Specifying the scheduler behaviour */
628 * @dl_throttled tells if we exhausted the runtime. If so, the
629 * task has to wait for a replenishment to be performed at the
630 * next firing of dl_timer.
632 * @dl_yielded tells if task gave up the CPU before consuming
633 * all its available runtime during the last job.
635 * @dl_non_contending tells if the task is inactive while still
636 * contributing to the active utilization. In other words, it
637 * indicates if the inactive timer has been armed and its handler
638 * has not been executed yet. This flag is useful to avoid race
639 * conditions between the inactive timer handler and the wakeup
642 * @dl_overrun tells if the task asked to be informed about runtime
645 unsigned int dl_throttled : 1;
646 unsigned int dl_yielded : 1;
647 unsigned int dl_non_contending : 1;
648 unsigned int dl_overrun : 1;
651 * Bandwidth enforcement timer. Each -deadline task has its
652 * own bandwidth to be enforced, thus we need one timer per task.
654 struct hrtimer dl_timer;
657 * Inactive timer, responsible for decreasing the active utilization
658 * at the "0-lag time". When a -deadline task blocks, it contributes
659 * to GRUB's active utilization until the "0-lag time", hence a
660 * timer is needed to decrease the active utilization at the correct
663 struct hrtimer inactive_timer;
665 #ifdef CONFIG_RT_MUTEXES
667 * Priority Inheritance. When a DEADLINE scheduling entity is boosted
668 * pi_se points to the donor, otherwise points to the dl_se it belongs
669 * to (the original one/itself).
671 struct sched_dl_entity *pi_se;
675 #ifdef CONFIG_UCLAMP_TASK
676 /* Number of utilization clamp buckets (shorter alias) */
677 #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT
680 * Utilization clamp for a scheduling entity
681 * @value: clamp value "assigned" to a se
682 * @bucket_id: bucket index corresponding to the "assigned" value
683 * @active: the se is currently refcounted in a rq's bucket
684 * @user_defined: the requested clamp value comes from user-space
686 * The bucket_id is the index of the clamp bucket matching the clamp value
687 * which is pre-computed and stored to avoid expensive integer divisions from
690 * The active bit is set whenever a task has got an "effective" value assigned,
691 * which can be different from the clamp value "requested" from user-space.
692 * This allows to know a task is refcounted in the rq's bucket corresponding
693 * to the "effective" bucket_id.
695 * The user_defined bit is set whenever a task has got a task-specific clamp
696 * value requested from userspace, i.e. the system defaults apply to this task
697 * just as a restriction. This allows to relax default clamps when a less
698 * restrictive task-specific value has been requested, thus allowing to
699 * implement a "nice" semantic. For example, a task running with a 20%
700 * default boost can still drop its own boosting to 0%.
703 unsigned int value : bits_per(SCHED_CAPACITY_SCALE);
704 unsigned int bucket_id : bits_per(UCLAMP_BUCKETS);
705 unsigned int active : 1;
706 unsigned int user_defined : 1;
708 #endif /* CONFIG_UCLAMP_TASK */
714 u8 exp_hint; /* Hint for performance. */
715 u8 need_mb; /* Readers need smp_mb(). */
717 u32 s; /* Set of bits. */
720 enum perf_event_task_context {
721 perf_invalid_context = -1,
724 perf_nr_task_contexts,
728 struct wake_q_node *next;
732 #ifdef CONFIG_KMAP_LOCAL
734 pte_t pteval[KM_MAX_IDX];
739 #ifdef CONFIG_THREAD_INFO_IN_TASK
741 * For reasons of header soup (see current_thread_info()), this
742 * must be the first element of task_struct.
744 struct thread_info thread_info;
746 unsigned int __state;
748 #ifdef CONFIG_PREEMPT_RT
749 /* saved state for "spinlock sleepers" */
750 unsigned int saved_state;
754 * This begins the randomizable portion of task_struct. Only
755 * scheduling-critical items should be added above here.
757 randomized_struct_fields_start
761 /* Per task flags (PF_*), defined further below: */
767 struct __call_single_node wake_entry;
768 unsigned int wakee_flips;
769 unsigned long wakee_flip_decay_ts;
770 struct task_struct *last_wakee;
773 * recent_used_cpu is initially set as the last CPU used by a task
774 * that wakes affine another task. Waker/wakee relationships can
775 * push tasks around a CPU where each wakeup moves to the next one.
776 * Tracking a recently used CPU allows a quick search for a recently
777 * used CPU that may be idle.
787 unsigned int rt_priority;
789 struct sched_entity se;
790 struct sched_rt_entity rt;
791 struct sched_dl_entity dl;
792 const struct sched_class *sched_class;
794 #ifdef CONFIG_SCHED_CORE
795 struct rb_node core_node;
796 unsigned long core_cookie;
797 unsigned int core_occupation;
800 #ifdef CONFIG_CGROUP_SCHED
801 struct task_group *sched_task_group;
804 #ifdef CONFIG_UCLAMP_TASK
806 * Clamp values requested for a scheduling entity.
807 * Must be updated with task_rq_lock() held.
809 struct uclamp_se uclamp_req[UCLAMP_CNT];
811 * Effective clamp values used for a scheduling entity.
812 * Must be updated with task_rq_lock() held.
814 struct uclamp_se uclamp[UCLAMP_CNT];
817 struct sched_statistics stats;
819 #ifdef CONFIG_PREEMPT_NOTIFIERS
820 /* List of struct preempt_notifier: */
821 struct hlist_head preempt_notifiers;
824 #ifdef CONFIG_BLK_DEV_IO_TRACE
825 unsigned int btrace_seq;
830 const cpumask_t *cpus_ptr;
831 cpumask_t *user_cpus_ptr;
833 void *migration_pending;
835 unsigned short migration_disabled;
837 unsigned short migration_flags;
839 #ifdef CONFIG_PREEMPT_RCU
840 int rcu_read_lock_nesting;
841 union rcu_special rcu_read_unlock_special;
842 struct list_head rcu_node_entry;
843 struct rcu_node *rcu_blocked_node;
844 #endif /* #ifdef CONFIG_PREEMPT_RCU */
846 #ifdef CONFIG_TASKS_RCU
847 unsigned long rcu_tasks_nvcsw;
848 u8 rcu_tasks_holdout;
850 int rcu_tasks_idle_cpu;
851 struct list_head rcu_tasks_holdout_list;
852 #endif /* #ifdef CONFIG_TASKS_RCU */
854 #ifdef CONFIG_TASKS_TRACE_RCU
855 int trc_reader_nesting;
857 union rcu_special trc_reader_special;
858 struct list_head trc_holdout_list;
859 struct list_head trc_blkd_node;
861 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
863 struct sched_info sched_info;
865 struct list_head tasks;
867 struct plist_node pushable_tasks;
868 struct rb_node pushable_dl_tasks;
871 struct mm_struct *mm;
872 struct mm_struct *active_mm;
877 /* The signal sent when the parent dies: */
879 /* JOBCTL_*, siglock protected: */
880 unsigned long jobctl;
882 /* Used for emulating ABI behavior of previous Linux versions: */
883 unsigned int personality;
885 /* Scheduler bits, serialized by scheduler locks: */
886 unsigned sched_reset_on_fork:1;
887 unsigned sched_contributes_to_load:1;
888 unsigned sched_migrated:1;
890 /* Force alignment to the next boundary: */
893 /* Unserialized, strictly 'current' */
896 * This field must not be in the scheduler word above due to wakelist
897 * queueing no longer being serialized by p->on_cpu. However:
900 * schedule() if (p->on_rq && ..) // false
901 * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true
902 * deactivate_task() ttwu_queue_wakelist())
903 * p->on_rq = 0; p->sched_remote_wakeup = Y;
905 * guarantees all stores of 'current' are visible before
906 * ->sched_remote_wakeup gets used, so it can be in this word.
908 unsigned sched_remote_wakeup:1;
910 /* Bit to tell LSMs we're in execve(): */
911 unsigned in_execve:1;
912 unsigned in_iowait:1;
913 #ifndef TIF_RESTORE_SIGMASK
914 unsigned restore_sigmask:1;
917 unsigned in_user_fault:1;
919 #ifdef CONFIG_LRU_GEN
920 /* whether the LRU algorithm may apply to this access */
921 unsigned in_lru_fault:1;
923 #ifdef CONFIG_COMPAT_BRK
924 unsigned brk_randomized:1;
926 #ifdef CONFIG_CGROUPS
927 /* disallow userland-initiated cgroup migration */
928 unsigned no_cgroup_migration:1;
929 /* task is frozen/stopped (used by the cgroup freezer) */
932 #ifdef CONFIG_BLK_CGROUP
933 unsigned use_memdelay:1;
936 /* Stalled due to lack of memory */
937 unsigned in_memstall:1;
939 #ifdef CONFIG_PAGE_OWNER
940 /* Used by page_owner=on to detect recursion in page tracking. */
941 unsigned in_page_owner:1;
943 #ifdef CONFIG_EVENTFD
944 /* Recursion prevention for eventfd_signal() */
945 unsigned in_eventfd:1;
947 #ifdef CONFIG_IOMMU_SVA
948 unsigned pasid_activated:1;
950 #ifdef CONFIG_CPU_SUP_INTEL
951 unsigned reported_split_lock:1;
953 #ifdef CONFIG_TASK_DELAY_ACCT
954 /* delay due to memory thrashing */
955 unsigned in_thrashing:1;
958 unsigned long atomic_flags; /* Flags requiring atomic access. */
960 struct restart_block restart_block;
965 #ifdef CONFIG_STACKPROTECTOR
966 /* Canary value for the -fstack-protector GCC feature: */
967 unsigned long stack_canary;
970 * Pointers to the (original) parent process, youngest child, younger sibling,
971 * older sibling, respectively. (p->father can be replaced with
972 * p->real_parent->pid)
975 /* Real parent process: */
976 struct task_struct __rcu *real_parent;
978 /* Recipient of SIGCHLD, wait4() reports: */
979 struct task_struct __rcu *parent;
982 * Children/sibling form the list of natural children:
984 struct list_head children;
985 struct list_head sibling;
986 struct task_struct *group_leader;
989 * 'ptraced' is the list of tasks this task is using ptrace() on.
991 * This includes both natural children and PTRACE_ATTACH targets.
992 * 'ptrace_entry' is this task's link on the p->parent->ptraced list.
994 struct list_head ptraced;
995 struct list_head ptrace_entry;
997 /* PID/PID hash table linkage. */
998 struct pid *thread_pid;
999 struct hlist_node pid_links[PIDTYPE_MAX];
1000 struct list_head thread_group;
1001 struct list_head thread_node;
1003 struct completion *vfork_done;
1005 /* CLONE_CHILD_SETTID: */
1006 int __user *set_child_tid;
1008 /* CLONE_CHILD_CLEARTID: */
1009 int __user *clear_child_tid;
1011 /* PF_KTHREAD | PF_IO_WORKER */
1012 void *worker_private;
1016 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1021 struct prev_cputime prev_cputime;
1022 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1026 #ifdef CONFIG_NO_HZ_FULL
1027 atomic_t tick_dep_mask;
1029 /* Context switch counts: */
1030 unsigned long nvcsw;
1031 unsigned long nivcsw;
1033 /* Monotonic time in nsecs: */
1036 /* Boot based time in nsecs: */
1039 /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
1040 unsigned long min_flt;
1041 unsigned long maj_flt;
1043 /* Empty if CONFIG_POSIX_CPUTIMERS=n */
1044 struct posix_cputimers posix_cputimers;
1046 #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
1047 struct posix_cputimers_work posix_cputimers_work;
1050 /* Process credentials: */
1052 /* Tracer's credentials at attach: */
1053 const struct cred __rcu *ptracer_cred;
1055 /* Objective and real subjective task credentials (COW): */
1056 const struct cred __rcu *real_cred;
1058 /* Effective (overridable) subjective task credentials (COW): */
1059 const struct cred __rcu *cred;
1062 /* Cached requested key. */
1063 struct key *cached_requested_key;
1067 * executable name, excluding path.
1069 * - normally initialized setup_new_exec()
1070 * - access it with [gs]et_task_comm()
1071 * - lock it with task_lock()
1073 char comm[TASK_COMM_LEN];
1075 struct nameidata *nameidata;
1077 #ifdef CONFIG_SYSVIPC
1078 struct sysv_sem sysvsem;
1079 struct sysv_shm sysvshm;
1081 #ifdef CONFIG_DETECT_HUNG_TASK
1082 unsigned long last_switch_count;
1083 unsigned long last_switch_time;
1085 /* Filesystem information: */
1086 struct fs_struct *fs;
1088 /* Open file information: */
1089 struct files_struct *files;
1091 #ifdef CONFIG_IO_URING
1092 struct io_uring_task *io_uring;
1096 struct nsproxy *nsproxy;
1098 /* Signal handlers: */
1099 struct signal_struct *signal;
1100 struct sighand_struct __rcu *sighand;
1102 sigset_t real_blocked;
1103 /* Restored if set_restore_sigmask() was used: */
1104 sigset_t saved_sigmask;
1105 struct sigpending pending;
1106 unsigned long sas_ss_sp;
1108 unsigned int sas_ss_flags;
1110 struct callback_head *task_works;
1113 #ifdef CONFIG_AUDITSYSCALL
1114 struct audit_context *audit_context;
1117 unsigned int sessionid;
1119 struct seccomp seccomp;
1120 struct syscall_user_dispatch syscall_dispatch;
1122 /* Thread group tracking: */
1126 /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
1127 spinlock_t alloc_lock;
1129 /* Protection of the PI data structures: */
1130 raw_spinlock_t pi_lock;
1132 struct wake_q_node wake_q;
1134 #ifdef CONFIG_RT_MUTEXES
1135 /* PI waiters blocked on a rt_mutex held by this task: */
1136 struct rb_root_cached pi_waiters;
1137 /* Updated under owner's pi_lock and rq lock */
1138 struct task_struct *pi_top_task;
1139 /* Deadlock detection and priority inheritance handling: */
1140 struct rt_mutex_waiter *pi_blocked_on;
1143 #ifdef CONFIG_DEBUG_MUTEXES
1144 /* Mutex deadlock detection: */
1145 struct mutex_waiter *blocked_on;
1148 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1149 int non_block_count;
1152 #ifdef CONFIG_TRACE_IRQFLAGS
1153 struct irqtrace_events irqtrace;
1154 unsigned int hardirq_threaded;
1155 u64 hardirq_chain_key;
1156 int softirqs_enabled;
1157 int softirq_context;
1160 #ifdef CONFIG_PREEMPT_RT
1161 int softirq_disable_cnt;
1164 #ifdef CONFIG_LOCKDEP
1165 # define MAX_LOCK_DEPTH 48UL
1168 unsigned int lockdep_recursion;
1169 struct held_lock held_locks[MAX_LOCK_DEPTH];
1172 #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
1173 unsigned int in_ubsan;
1176 /* Journalling filesystem info: */
1179 /* Stacked block device info: */
1180 struct bio_list *bio_list;
1182 /* Stack plugging: */
1183 struct blk_plug *plug;
1186 struct reclaim_state *reclaim_state;
1188 struct io_context *io_context;
1190 #ifdef CONFIG_COMPACTION
1191 struct capture_control *capture_control;
1194 unsigned long ptrace_message;
1195 kernel_siginfo_t *last_siginfo;
1197 struct task_io_accounting ioac;
1199 /* Pressure stall state */
1200 unsigned int psi_flags;
1202 #ifdef CONFIG_TASK_XACCT
1203 /* Accumulated RSS usage: */
1205 /* Accumulated virtual memory usage: */
1207 /* stime + utime since last update: */
1210 #ifdef CONFIG_CPUSETS
1211 /* Protected by ->alloc_lock: */
1212 nodemask_t mems_allowed;
1213 /* Sequence number to catch updates: */
1214 seqcount_spinlock_t mems_allowed_seq;
1215 int cpuset_mem_spread_rotor;
1216 int cpuset_slab_spread_rotor;
1218 #ifdef CONFIG_CGROUPS
1219 /* Control Group info protected by css_set_lock: */
1220 struct css_set __rcu *cgroups;
1221 /* cg_list protected by css_set_lock and tsk->alloc_lock: */
1222 struct list_head cg_list;
1224 #ifdef CONFIG_X86_CPU_RESCTRL
1229 struct robust_list_head __user *robust_list;
1230 #ifdef CONFIG_COMPAT
1231 struct compat_robust_list_head __user *compat_robust_list;
1233 struct list_head pi_state_list;
1234 struct futex_pi_state *pi_state_cache;
1235 struct mutex futex_exit_mutex;
1236 unsigned int futex_state;
1238 #ifdef CONFIG_PERF_EVENTS
1239 struct perf_event_context *perf_event_ctxp;
1240 struct mutex perf_event_mutex;
1241 struct list_head perf_event_list;
1243 #ifdef CONFIG_DEBUG_PREEMPT
1244 unsigned long preempt_disable_ip;
1247 /* Protected by alloc_lock: */
1248 struct mempolicy *mempolicy;
1250 short pref_node_fork;
1252 #ifdef CONFIG_NUMA_BALANCING
1254 unsigned int numa_scan_period;
1255 unsigned int numa_scan_period_max;
1256 int numa_preferred_nid;
1257 unsigned long numa_migrate_retry;
1258 /* Migration stamp: */
1260 u64 last_task_numa_placement;
1261 u64 last_sum_exec_runtime;
1262 struct callback_head numa_work;
1265 * This pointer is only modified for current in syscall and
1266 * pagefault context (and for tasks being destroyed), so it can be read
1267 * from any of the following contexts:
1268 * - RCU read-side critical section
1269 * - current->numa_group from everywhere
1270 * - task's runqueue locked, task not running
1272 struct numa_group __rcu *numa_group;
1275 * numa_faults is an array split into four regions:
1276 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1277 * in this precise order.
1279 * faults_memory: Exponential decaying average of faults on a per-node
1280 * basis. Scheduling placement decisions are made based on these
1281 * counts. The values remain static for the duration of a PTE scan.
1282 * faults_cpu: Track the nodes the process was running on when a NUMA
1283 * hinting fault was incurred.
1284 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1285 * during the current scan window. When the scan completes, the counts
1286 * in faults_memory and faults_cpu decay and these values are copied.
1288 unsigned long *numa_faults;
1289 unsigned long total_numa_faults;
1292 * numa_faults_locality tracks if faults recorded during the last
1293 * scan window were remote/local or failed to migrate. The task scan
1294 * period is adapted based on the locality of the faults with different
1295 * weights depending on whether they were shared or private faults
1297 unsigned long numa_faults_locality[3];
1299 unsigned long numa_pages_migrated;
1300 #endif /* CONFIG_NUMA_BALANCING */
1303 struct rseq __user *rseq;
1307 * RmW on rseq_event_mask must be performed atomically
1308 * with respect to preemption.
1310 unsigned long rseq_event_mask;
1313 #ifdef CONFIG_SCHED_MM_CID
1314 int mm_cid; /* Current cid in mm */
1315 int last_mm_cid; /* Most recent cid in mm */
1316 int migrate_from_cpu;
1317 int mm_cid_active; /* Whether cid bitmap is active */
1318 struct callback_head cid_work;
1321 struct tlbflush_unmap_batch tlb_ubc;
1323 /* Cache last used pipe for splice(): */
1324 struct pipe_inode_info *splice_pipe;
1326 struct page_frag task_frag;
1328 #ifdef CONFIG_TASK_DELAY_ACCT
1329 struct task_delay_info *delays;
1332 #ifdef CONFIG_FAULT_INJECTION
1334 unsigned int fail_nth;
1337 * When (nr_dirtied >= nr_dirtied_pause), it's time to call
1338 * balance_dirty_pages() for a dirty throttling pause:
1341 int nr_dirtied_pause;
1342 /* Start of a write-and-pause period: */
1343 unsigned long dirty_paused_when;
1345 #ifdef CONFIG_LATENCYTOP
1346 int latency_record_count;
1347 struct latency_record latency_record[LT_SAVECOUNT];
1350 * Time slack values; these are used to round up poll() and
1351 * select() etc timeout values. These are in nanoseconds.
1354 u64 default_timer_slack_ns;
1356 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
1357 unsigned int kasan_depth;
1361 struct kcsan_ctx kcsan_ctx;
1362 #ifdef CONFIG_TRACE_IRQFLAGS
1363 struct irqtrace_events kcsan_save_irqtrace;
1365 #ifdef CONFIG_KCSAN_WEAK_MEMORY
1366 int kcsan_stack_depth;
1371 struct kmsan_ctx kmsan_ctx;
1374 #if IS_ENABLED(CONFIG_KUNIT)
1375 struct kunit *kunit_test;
1378 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1379 /* Index of current stored address in ret_stack: */
1383 /* Stack of return addresses for return function tracing: */
1384 struct ftrace_ret_stack *ret_stack;
1386 /* Timestamp for last schedule: */
1387 unsigned long long ftrace_timestamp;
1390 * Number of functions that haven't been traced
1391 * because of depth overrun:
1393 atomic_t trace_overrun;
1395 /* Pause tracing: */
1396 atomic_t tracing_graph_pause;
1399 #ifdef CONFIG_TRACING
1400 /* Bitmask and counter of trace recursion: */
1401 unsigned long trace_recursion;
1402 #endif /* CONFIG_TRACING */
1405 /* See kernel/kcov.c for more details. */
1407 /* Coverage collection mode enabled for this task (0 if disabled): */
1408 unsigned int kcov_mode;
1410 /* Size of the kcov_area: */
1411 unsigned int kcov_size;
1413 /* Buffer for coverage collection: */
1416 /* KCOV descriptor wired with this task or NULL: */
1419 /* KCOV common handle for remote coverage collection: */
1422 /* KCOV sequence number: */
1425 /* Collect coverage from softirq context: */
1426 unsigned int kcov_softirq;
1430 struct mem_cgroup *memcg_in_oom;
1431 gfp_t memcg_oom_gfp_mask;
1432 int memcg_oom_order;
1434 /* Number of pages to reclaim on returning to userland: */
1435 unsigned int memcg_nr_pages_over_high;
1437 /* Used by memcontrol for targeted memcg charge: */
1438 struct mem_cgroup *active_memcg;
1441 #ifdef CONFIG_BLK_CGROUP
1442 struct gendisk *throttle_disk;
1445 #ifdef CONFIG_UPROBES
1446 struct uprobe_task *utask;
1448 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1449 unsigned int sequential_io;
1450 unsigned int sequential_io_avg;
1452 struct kmap_ctrl kmap_ctrl;
1453 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1454 unsigned long task_state_change;
1455 # ifdef CONFIG_PREEMPT_RT
1456 unsigned long saved_state_change;
1459 struct rcu_head rcu;
1460 refcount_t rcu_users;
1461 int pagefault_disabled;
1463 struct task_struct *oom_reaper_list;
1464 struct timer_list oom_reaper_timer;
1466 #ifdef CONFIG_VMAP_STACK
1467 struct vm_struct *stack_vm_area;
1469 #ifdef CONFIG_THREAD_INFO_IN_TASK
1470 /* A live task holds one reference: */
1471 refcount_t stack_refcount;
1473 #ifdef CONFIG_LIVEPATCH
1476 #ifdef CONFIG_SECURITY
1477 /* Used by LSM modules for access restriction: */
1480 #ifdef CONFIG_BPF_SYSCALL
1481 /* Used by BPF task local storage */
1482 struct bpf_local_storage __rcu *bpf_storage;
1483 /* Used for BPF run context */
1484 struct bpf_run_ctx *bpf_ctx;
1487 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
1488 unsigned long lowest_stack;
1489 unsigned long prev_lowest_stack;
1492 #ifdef CONFIG_X86_MCE
1493 void __user *mce_vaddr;
1498 __mce_reserved : 62;
1499 struct callback_head mce_kill_me;
1503 #ifdef CONFIG_KRETPROBES
1504 struct llist_head kretprobe_instances;
1506 #ifdef CONFIG_RETHOOK
1507 struct llist_head rethooks;
1510 #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
1512 * If L1D flush is supported on mm context switch
1513 * then we use this callback head to queue kill work
1514 * to kill tasks that are not running on SMT disabled
1517 struct callback_head l1d_flush_kill;
1522 * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS.
1523 * If we find justification for more monitors, we can think
1524 * about adding more or developing a dynamic method. So far,
1525 * none of these are justified.
1527 union rv_task_monitor rv[RV_PER_TASK_MONITORS];
1530 #ifdef CONFIG_USER_EVENTS
1531 struct user_event_mm *user_event_mm;
1535 * New fields for task_struct should be added above here, so that
1536 * they are included in the randomized portion of task_struct.
1538 randomized_struct_fields_end
1540 /* CPU-specific state of this task: */
1541 struct thread_struct thread;
1544 * WARNING: on x86, 'thread_struct' contains a variable-sized
1545 * structure. It *MUST* be at the end of 'task_struct'.
1547 * Do not put anything below here!
1551 static inline struct pid *task_pid(struct task_struct *task)
1553 return task->thread_pid;
1557 * the helpers to get the task's different pids as they are seen
1558 * from various namespaces
1560 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1561 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1563 * task_xid_nr_ns() : id seen from the ns specified;
1565 * see also pid_nr() etc in include/linux/pid.h
1567 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);
1569 static inline pid_t task_pid_nr(struct task_struct *tsk)
1574 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1576 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1579 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1581 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1585 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1591 * pid_alive - check that a task structure is not stale
1592 * @p: Task structure to be checked.
1594 * Test if a process is not yet dead (at most zombie state)
1595 * If pid_alive fails, then pointers within the task structure
1596 * can be stale and must not be dereferenced.
1598 * Return: 1 if the process is alive. 0 otherwise.
1600 static inline int pid_alive(const struct task_struct *p)
1602 return p->thread_pid != NULL;
1605 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1607 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1610 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1612 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1616 static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1618 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1621 static inline pid_t task_session_vnr(struct task_struct *tsk)
1623 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1626 static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1628 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
1631 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1633 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
1636 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
1642 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
1648 static inline pid_t task_ppid_nr(const struct task_struct *tsk)
1650 return task_ppid_nr_ns(tsk, &init_pid_ns);
1653 /* Obsolete, do not use: */
1654 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1656 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1659 #define TASK_REPORT_IDLE (TASK_REPORT + 1)
1660 #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1)
1662 static inline unsigned int __task_state_index(unsigned int tsk_state,
1663 unsigned int tsk_exit_state)
1665 unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT;
1667 BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
1669 if (tsk_state == TASK_IDLE)
1670 state = TASK_REPORT_IDLE;
1673 * We're lying here, but rather than expose a completely new task state
1674 * to userspace, we can make this appear as if the task has gone through
1675 * a regular rt_mutex_lock() call.
1677 if (tsk_state == TASK_RTLOCK_WAIT)
1678 state = TASK_UNINTERRUPTIBLE;
1683 static inline unsigned int task_state_index(struct task_struct *tsk)
1685 return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state);
1688 static inline char task_index_to_char(unsigned int state)
1690 static const char state_char[] = "RSDTtXZPI";
1692 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
1694 return state_char[state];
1697 static inline char task_state_to_char(struct task_struct *tsk)
1699 return task_index_to_char(task_state_index(tsk));
1703 * is_global_init - check if a task structure is init. Since init
1704 * is free to have sub-threads we need to check tgid.
1705 * @tsk: Task structure to be checked.
1707 * Check if a task structure is the first user space task the kernel created.
1709 * Return: 1 if the task structure is init. 0 otherwise.
1711 static inline int is_global_init(struct task_struct *tsk)
1713 return task_tgid_nr(tsk) == 1;
1716 extern struct pid *cad_pid;
1721 #define PF_VCPU 0x00000001 /* I'm a virtual CPU */
1722 #define PF_IDLE 0x00000002 /* I am an IDLE thread */
1723 #define PF_EXITING 0x00000004 /* Getting shut down */
1724 #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */
1725 #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */
1726 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1727 #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
1728 #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */
1729 #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */
1730 #define PF_DUMPCORE 0x00000200 /* Dumped core */
1731 #define PF_SIGNALED 0x00000400 /* Killed by a signal */
1732 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1733 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */
1734 #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */
1735 #define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */
1736 #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */
1737 #define PF__HOLE__00010000 0x00010000
1738 #define PF_KSWAPD 0x00020000 /* I am kswapd */
1739 #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */
1740 #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */
1741 #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to,
1742 * I am cleaning dirty pages from some other bdi. */
1743 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1744 #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
1745 #define PF__HOLE__00800000 0x00800000
1746 #define PF__HOLE__01000000 0x01000000
1747 #define PF__HOLE__02000000 0x02000000
1748 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
1749 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1750 #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */
1751 #define PF__HOLE__20000000 0x20000000
1752 #define PF__HOLE__40000000 0x40000000
1753 #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
1756 * Only the _current_ task can read/write to tsk->flags, but other
1757 * tasks can access tsk->flags in readonly mode for example
1758 * with tsk_used_math (like during threaded core dumping).
1759 * There is however an exception to this rule during ptrace
1760 * or during fork: the ptracer task is allowed to write to the
1761 * child->flags of its traced child (same goes for fork, the parent
1762 * can write to the child->flags), because we're guaranteed the
1763 * child is not running and in turn not changing child->flags
1764 * at the same time the parent does it.
1766 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1767 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1768 #define clear_used_math() clear_stopped_child_used_math(current)
1769 #define set_used_math() set_stopped_child_used_math(current)
1771 #define conditional_stopped_child_used_math(condition, child) \
1772 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1774 #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current)
1776 #define copy_to_stopped_child_used_math(child) \
1777 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1779 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1780 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1781 #define used_math() tsk_used_math(current)
1783 static __always_inline bool is_percpu_thread(void)
1786 return (current->flags & PF_NO_SETAFFINITY) &&
1787 (current->nr_cpus_allowed == 1);
1793 /* Per-process atomic flags. */
1794 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
1795 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
1796 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
1797 #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */
1798 #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/
1799 #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */
1800 #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */
1801 #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */
1803 #define TASK_PFA_TEST(name, func) \
1804 static inline bool task_##func(struct task_struct *p) \
1805 { return test_bit(PFA_##name, &p->atomic_flags); }
1807 #define TASK_PFA_SET(name, func) \
1808 static inline void task_set_##func(struct task_struct *p) \
1809 { set_bit(PFA_##name, &p->atomic_flags); }
1811 #define TASK_PFA_CLEAR(name, func) \
1812 static inline void task_clear_##func(struct task_struct *p) \
1813 { clear_bit(PFA_##name, &p->atomic_flags); }
1815 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
1816 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
1818 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
1819 TASK_PFA_SET(SPREAD_PAGE, spread_page)
1820 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
1822 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
1823 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
1824 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
1826 TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
1827 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
1828 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
1830 TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1831 TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1832 TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1834 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1835 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1837 TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable)
1838 TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable)
1839 TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable)
1841 TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1842 TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1845 current_restore_flags(unsigned long orig_flags, unsigned long flags)
1847 current->flags &= ~flags;
1848 current->flags |= orig_flags & flags;
1851 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
1852 extern int task_can_attach(struct task_struct *p);
1853 extern int dl_bw_alloc(int cpu, u64 dl_bw);
1854 extern void dl_bw_free(int cpu, u64 dl_bw);
1856 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
1857 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
1858 extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
1859 extern void release_user_cpus_ptr(struct task_struct *p);
1860 extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask);
1861 extern void force_compatible_cpus_allowed_ptr(struct task_struct *p);
1862 extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p);
1864 static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
1867 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
1869 if (!cpumask_test_cpu(0, new_mask))
1873 static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node)
1875 if (src->user_cpus_ptr)
1879 static inline void release_user_cpus_ptr(struct task_struct *p)
1881 WARN_ON(p->user_cpus_ptr);
1884 static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask)
1890 extern int yield_to(struct task_struct *p, bool preempt);
1891 extern void set_user_nice(struct task_struct *p, long nice);
1892 extern int task_prio(const struct task_struct *p);
1895 * task_nice - return the nice value of a given task.
1896 * @p: the task in question.
1898 * Return: The nice value [ -20 ... 0 ... 19 ].
1900 static inline int task_nice(const struct task_struct *p)
1902 return PRIO_TO_NICE((p)->static_prio);
1905 extern int can_nice(const struct task_struct *p, const int nice);
1906 extern int task_curr(const struct task_struct *p);
1907 extern int idle_cpu(int cpu);
1908 extern int available_idle_cpu(int cpu);
1909 extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
1910 extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
1911 extern void sched_set_fifo(struct task_struct *p);
1912 extern void sched_set_fifo_low(struct task_struct *p);
1913 extern void sched_set_normal(struct task_struct *p, int nice);
1914 extern int sched_setattr(struct task_struct *, const struct sched_attr *);
1915 extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
1916 extern struct task_struct *idle_task(int cpu);
1919 * is_idle_task - is the specified task an idle task?
1920 * @p: the task in question.
1922 * Return: 1 if @p is an idle task. 0 otherwise.
1924 static __always_inline bool is_idle_task(const struct task_struct *p)
1926 return !!(p->flags & PF_IDLE);
1929 extern struct task_struct *curr_task(int cpu);
1930 extern void ia64_set_curr_task(int cpu, struct task_struct *p);
1934 union thread_union {
1935 #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK
1936 struct task_struct task;
1938 #ifndef CONFIG_THREAD_INFO_IN_TASK
1939 struct thread_info thread_info;
1941 unsigned long stack[THREAD_SIZE/sizeof(long)];
1944 #ifndef CONFIG_THREAD_INFO_IN_TASK
1945 extern struct thread_info init_thread_info;
1948 extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)];
1950 #ifdef CONFIG_THREAD_INFO_IN_TASK
1951 # define task_thread_info(task) (&(task)->thread_info)
1952 #elif !defined(__HAVE_THREAD_FUNCTIONS)
1953 # define task_thread_info(task) ((struct thread_info *)(task)->stack)
1957 * find a task by one of its numerical ids
1959 * find_task_by_pid_ns():
1960 * finds a task by its pid in the specified namespace
1961 * find_task_by_vpid():
1962 * finds a task by its virtual pid
1964 * see also find_vpid() etc in include/linux/pid.h
1967 extern struct task_struct *find_task_by_vpid(pid_t nr);
1968 extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
1971 * find a task by its virtual pid and get the task struct
1973 extern struct task_struct *find_get_task_by_vpid(pid_t nr);
1975 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1976 extern int wake_up_process(struct task_struct *tsk);
1977 extern void wake_up_new_task(struct task_struct *tsk);
1980 extern void kick_process(struct task_struct *tsk);
1982 static inline void kick_process(struct task_struct *tsk) { }
1985 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
1987 static inline void set_task_comm(struct task_struct *tsk, const char *from)
1989 __set_task_comm(tsk, from, false);
1992 extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk);
1993 #define get_task_comm(buf, tsk) ({ \
1994 BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \
1995 __get_task_comm(buf, sizeof(buf), tsk); \
1999 static __always_inline void scheduler_ipi(void)
2002 * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting
2003 * TIF_NEED_RESCHED remotely (for the first time) will also send
2006 preempt_fold_need_resched();
2009 static inline void scheduler_ipi(void) { }
2012 extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
2015 * Set thread flags in other task's structures.
2016 * See asm/thread_info.h for TIF_xxxx flags available:
2018 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2020 set_ti_thread_flag(task_thread_info(tsk), flag);
2023 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2025 clear_ti_thread_flag(task_thread_info(tsk), flag);
2028 static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
2031 update_ti_thread_flag(task_thread_info(tsk), flag, value);
2034 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2036 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2039 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2041 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2044 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2046 return test_ti_thread_flag(task_thread_info(tsk), flag);
2049 static inline void set_tsk_need_resched(struct task_struct *tsk)
2051 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2054 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2056 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2059 static inline int test_tsk_need_resched(struct task_struct *tsk)
2061 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2065 * cond_resched() and cond_resched_lock(): latency reduction via
2066 * explicit rescheduling in places that are safe. The return
2067 * value indicates whether a reschedule was done in fact.
2068 * cond_resched_lock() will drop the spinlock before scheduling,
2070 #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
2071 extern int __cond_resched(void);
2073 #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)
2075 void sched_dynamic_klp_enable(void);
2076 void sched_dynamic_klp_disable(void);
2078 DECLARE_STATIC_CALL(cond_resched, __cond_resched);
2080 static __always_inline int _cond_resched(void)
2082 return static_call_mod(cond_resched)();
2085 #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
2087 extern int dynamic_cond_resched(void);
2089 static __always_inline int _cond_resched(void)
2091 return dynamic_cond_resched();
2094 #else /* !CONFIG_PREEMPTION */
2096 static inline int _cond_resched(void)
2098 klp_sched_try_switch();
2099 return __cond_resched();
2102 #endif /* PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_CALL */
2104 #else /* CONFIG_PREEMPTION && !CONFIG_PREEMPT_DYNAMIC */
2106 static inline int _cond_resched(void)
2108 klp_sched_try_switch();
2112 #endif /* !CONFIG_PREEMPTION || CONFIG_PREEMPT_DYNAMIC */
2114 #define cond_resched() ({ \
2115 __might_resched(__FILE__, __LINE__, 0); \
2119 extern int __cond_resched_lock(spinlock_t *lock);
2120 extern int __cond_resched_rwlock_read(rwlock_t *lock);
2121 extern int __cond_resched_rwlock_write(rwlock_t *lock);
2123 #define MIGHT_RESCHED_RCU_SHIFT 8
2124 #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1)
2126 #ifndef CONFIG_PREEMPT_RT
2128 * Non RT kernels have an elevated preempt count due to the held lock,
2129 * but are not allowed to be inside a RCU read side critical section
2131 # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET
2134 * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in
2135 * cond_resched*lock() has to take that into account because it checks for
2136 * preempt_count() and rcu_preempt_depth().
2138 # define PREEMPT_LOCK_RESCHED_OFFSETS \
2139 (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT))
2142 #define cond_resched_lock(lock) ({ \
2143 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2144 __cond_resched_lock(lock); \
2147 #define cond_resched_rwlock_read(lock) ({ \
2148 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2149 __cond_resched_rwlock_read(lock); \
2152 #define cond_resched_rwlock_write(lock) ({ \
2153 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2154 __cond_resched_rwlock_write(lock); \
2157 static inline void cond_resched_rcu(void)
2159 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2166 #ifdef CONFIG_PREEMPT_DYNAMIC
2168 extern bool preempt_model_none(void);
2169 extern bool preempt_model_voluntary(void);
2170 extern bool preempt_model_full(void);
2174 static inline bool preempt_model_none(void)
2176 return IS_ENABLED(CONFIG_PREEMPT_NONE);
2178 static inline bool preempt_model_voluntary(void)
2180 return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY);
2182 static inline bool preempt_model_full(void)
2184 return IS_ENABLED(CONFIG_PREEMPT);
2189 static inline bool preempt_model_rt(void)
2191 return IS_ENABLED(CONFIG_PREEMPT_RT);
2195 * Does the preemption model allow non-cooperative preemption?
2197 * For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with
2198 * CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the
2199 * kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the
2200 * PREEMPT_NONE model.
2202 static inline bool preempt_model_preemptible(void)
2204 return preempt_model_full() || preempt_model_rt();
2208 * Does a critical section need to be broken due to another
2209 * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
2210 * but a general need for low latency)
2212 static inline int spin_needbreak(spinlock_t *lock)
2214 #ifdef CONFIG_PREEMPTION
2215 return spin_is_contended(lock);
2222 * Check if a rwlock is contended.
2223 * Returns non-zero if there is another task waiting on the rwlock.
2224 * Returns zero if the lock is not contended or the system / underlying
2225 * rwlock implementation does not support contention detection.
2226 * Technically does not depend on CONFIG_PREEMPTION, but a general need
2229 static inline int rwlock_needbreak(rwlock_t *lock)
2231 #ifdef CONFIG_PREEMPTION
2232 return rwlock_is_contended(lock);
2238 static __always_inline bool need_resched(void)
2240 return unlikely(tif_need_resched());
2244 * Wrappers for p->thread_info->cpu access. No-op on UP.
2248 static inline unsigned int task_cpu(const struct task_struct *p)
2250 return READ_ONCE(task_thread_info(p)->cpu);
2253 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2257 static inline unsigned int task_cpu(const struct task_struct *p)
2262 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2266 #endif /* CONFIG_SMP */
2268 extern bool sched_task_on_rq(struct task_struct *p);
2269 extern unsigned long get_wchan(struct task_struct *p);
2270 extern struct task_struct *cpu_curr_snapshot(int cpu);
2273 * In order to reduce various lock holder preemption latencies provide an
2274 * interface to see if a vCPU is currently running or not.
2276 * This allows us to terminate optimistic spin loops and block, analogous to
2277 * the native optimistic spin heuristic of testing if the lock owner task is
2280 #ifndef vcpu_is_preempted
2281 static inline bool vcpu_is_preempted(int cpu)
2287 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2288 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2290 #ifndef TASK_SIZE_OF
2291 #define TASK_SIZE_OF(tsk) TASK_SIZE
2295 static inline bool owner_on_cpu(struct task_struct *owner)
2298 * As lock holder preemption issue, we both skip spinning if
2299 * task is not on cpu or its cpu is preempted
2301 return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner));
2304 /* Returns effective CPU energy utilization, as seen by the scheduler */
2305 unsigned long sched_cpu_util(int cpu);
2306 #endif /* CONFIG_SMP */
2311 * Map the event mask on the user-space ABI enum rseq_cs_flags
2312 * for direct mask checks.
2314 enum rseq_event_mask_bits {
2315 RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT,
2316 RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT,
2317 RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT,
2320 enum rseq_event_mask {
2321 RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT),
2322 RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT),
2323 RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT),
2326 static inline void rseq_set_notify_resume(struct task_struct *t)
2329 set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
2332 void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);
2334 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2335 struct pt_regs *regs)
2338 __rseq_handle_notify_resume(ksig, regs);
2341 static inline void rseq_signal_deliver(struct ksignal *ksig,
2342 struct pt_regs *regs)
2345 __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
2347 rseq_handle_notify_resume(ksig, regs);
2350 /* rseq_preempt() requires preemption to be disabled. */
2351 static inline void rseq_preempt(struct task_struct *t)
2353 __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
2354 rseq_set_notify_resume(t);
2357 /* rseq_migrate() requires preemption to be disabled. */
2358 static inline void rseq_migrate(struct task_struct *t)
2360 __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
2361 rseq_set_notify_resume(t);
2365 * If parent process has a registered restartable sequences area, the
2366 * child inherits. Unregister rseq for a clone with CLONE_VM set.
2368 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2370 if (clone_flags & CLONE_VM) {
2374 t->rseq_event_mask = 0;
2376 t->rseq = current->rseq;
2377 t->rseq_len = current->rseq_len;
2378 t->rseq_sig = current->rseq_sig;
2379 t->rseq_event_mask = current->rseq_event_mask;
2383 static inline void rseq_execve(struct task_struct *t)
2388 t->rseq_event_mask = 0;
2393 static inline void rseq_set_notify_resume(struct task_struct *t)
2396 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2397 struct pt_regs *regs)
2400 static inline void rseq_signal_deliver(struct ksignal *ksig,
2401 struct pt_regs *regs)
2404 static inline void rseq_preempt(struct task_struct *t)
2407 static inline void rseq_migrate(struct task_struct *t)
2410 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2413 static inline void rseq_execve(struct task_struct *t)
2419 #ifdef CONFIG_DEBUG_RSEQ
2421 void rseq_syscall(struct pt_regs *regs);
2425 static inline void rseq_syscall(struct pt_regs *regs)
2431 #ifdef CONFIG_SCHED_CORE
2432 extern void sched_core_free(struct task_struct *tsk);
2433 extern void sched_core_fork(struct task_struct *p);
2434 extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type,
2435 unsigned long uaddr);
2437 static inline void sched_core_free(struct task_struct *tsk) { }
2438 static inline void sched_core_fork(struct task_struct *p) { }
2441 extern void sched_set_stop_task(int cpu, struct task_struct *stop);