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): */
44 struct backing_dev_info;
47 struct bpf_local_storage;
49 struct capture_control;
52 struct futex_pi_state;
58 struct perf_event_context;
60 struct pipe_inode_info;
63 struct robust_list_head;
69 struct sighand_struct;
71 struct task_delay_info;
76 * Task state bitmask. NOTE! These bits are also
77 * encoded in fs/proc/array.c: get_task_state().
79 * We have two separate sets of flags: task->state
80 * is about runnability, while task->exit_state are
81 * about the task exiting. Confusing, but this way
82 * modifying one set can't modify the other one by
86 /* Used in tsk->state: */
87 #define TASK_RUNNING 0x00000000
88 #define TASK_INTERRUPTIBLE 0x00000001
89 #define TASK_UNINTERRUPTIBLE 0x00000002
90 #define __TASK_STOPPED 0x00000004
91 #define __TASK_TRACED 0x00000008
92 /* Used in tsk->exit_state: */
93 #define EXIT_DEAD 0x00000010
94 #define EXIT_ZOMBIE 0x00000020
95 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD)
96 /* Used in tsk->state again: */
97 #define TASK_PARKED 0x00000040
98 #define TASK_DEAD 0x00000080
99 #define TASK_WAKEKILL 0x00000100
100 #define TASK_WAKING 0x00000200
101 #define TASK_NOLOAD 0x00000400
102 #define TASK_NEW 0x00000800
103 #define TASK_RTLOCK_WAIT 0x00001000
104 #define TASK_FREEZABLE 0x00002000
105 #define __TASK_FREEZABLE_UNSAFE (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP))
106 #define TASK_FROZEN 0x00008000
107 #define TASK_STATE_MAX 0x00010000
109 #define TASK_ANY (TASK_STATE_MAX-1)
112 * DO NOT ADD ANY NEW USERS !
114 #define TASK_FREEZABLE_UNSAFE (TASK_FREEZABLE | __TASK_FREEZABLE_UNSAFE)
116 /* Convenience macros for the sake of set_current_state: */
117 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
118 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
119 #define TASK_TRACED __TASK_TRACED
121 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
123 /* Convenience macros for the sake of wake_up(): */
124 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
126 /* get_task_state(): */
127 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
128 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
129 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
132 #define task_is_running(task) (READ_ONCE((task)->__state) == TASK_RUNNING)
134 #define task_is_traced(task) ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
135 #define task_is_stopped(task) ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
136 #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
139 * Special states are those that do not use the normal wait-loop pattern. See
140 * the comment with set_special_state().
142 #define is_special_task_state(state) \
143 ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD))
145 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
146 # define debug_normal_state_change(state_value) \
148 WARN_ON_ONCE(is_special_task_state(state_value)); \
149 current->task_state_change = _THIS_IP_; \
152 # define debug_special_state_change(state_value) \
154 WARN_ON_ONCE(!is_special_task_state(state_value)); \
155 current->task_state_change = _THIS_IP_; \
158 # define debug_rtlock_wait_set_state() \
160 current->saved_state_change = current->task_state_change;\
161 current->task_state_change = _THIS_IP_; \
164 # define debug_rtlock_wait_restore_state() \
166 current->task_state_change = current->saved_state_change;\
170 # define debug_normal_state_change(cond) do { } while (0)
171 # define debug_special_state_change(cond) do { } while (0)
172 # define debug_rtlock_wait_set_state() do { } while (0)
173 # define debug_rtlock_wait_restore_state() do { } while (0)
177 * set_current_state() includes a barrier so that the write of current->state
178 * is correctly serialised wrt the caller's subsequent test of whether to
182 * set_current_state(TASK_UNINTERRUPTIBLE);
188 * __set_current_state(TASK_RUNNING);
190 * If the caller does not need such serialisation (because, for instance, the
191 * CONDITION test and condition change and wakeup are under the same lock) then
192 * use __set_current_state().
194 * The above is typically ordered against the wakeup, which does:
197 * wake_up_state(p, TASK_UNINTERRUPTIBLE);
199 * where wake_up_state()/try_to_wake_up() executes a full memory barrier before
200 * accessing p->state.
202 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
203 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
204 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
206 * However, with slightly different timing the wakeup TASK_RUNNING store can
207 * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
208 * a problem either because that will result in one extra go around the loop
209 * and our @cond test will save the day.
211 * Also see the comments of try_to_wake_up().
213 #define __set_current_state(state_value) \
215 debug_normal_state_change((state_value)); \
216 WRITE_ONCE(current->__state, (state_value)); \
219 #define set_current_state(state_value) \
221 debug_normal_state_change((state_value)); \
222 smp_store_mb(current->__state, (state_value)); \
226 * set_special_state() should be used for those states when the blocking task
227 * can not use the regular condition based wait-loop. In that case we must
228 * serialize against wakeups such that any possible in-flight TASK_RUNNING
229 * stores will not collide with our state change.
231 #define set_special_state(state_value) \
233 unsigned long flags; /* may shadow */ \
235 raw_spin_lock_irqsave(¤t->pi_lock, flags); \
236 debug_special_state_change((state_value)); \
237 WRITE_ONCE(current->__state, (state_value)); \
238 raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \
242 * PREEMPT_RT specific variants for "sleeping" spin/rwlocks
244 * RT's spin/rwlock substitutions are state preserving. The state of the
245 * task when blocking on the lock is saved in task_struct::saved_state and
246 * restored after the lock has been acquired. These operations are
247 * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT
248 * lock related wakeups while the task is blocked on the lock are
249 * redirected to operate on task_struct::saved_state to ensure that these
250 * are not dropped. On restore task_struct::saved_state is set to
251 * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail.
253 * The lock operation looks like this:
255 * current_save_and_set_rtlock_wait_state();
259 * raw_spin_unlock_irq(&lock->wait_lock);
261 * raw_spin_lock_irq(&lock->wait_lock);
262 * set_current_state(TASK_RTLOCK_WAIT);
264 * current_restore_rtlock_saved_state();
266 #define current_save_and_set_rtlock_wait_state() \
268 lockdep_assert_irqs_disabled(); \
269 raw_spin_lock(¤t->pi_lock); \
270 current->saved_state = current->__state; \
271 debug_rtlock_wait_set_state(); \
272 WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT); \
273 raw_spin_unlock(¤t->pi_lock); \
276 #define current_restore_rtlock_saved_state() \
278 lockdep_assert_irqs_disabled(); \
279 raw_spin_lock(¤t->pi_lock); \
280 debug_rtlock_wait_restore_state(); \
281 WRITE_ONCE(current->__state, current->saved_state); \
282 current->saved_state = TASK_RUNNING; \
283 raw_spin_unlock(¤t->pi_lock); \
286 #define get_current_state() READ_ONCE(current->__state)
289 * Define the task command name length as enum, then it can be visible to
296 extern void scheduler_tick(void);
298 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
300 extern long schedule_timeout(long timeout);
301 extern long schedule_timeout_interruptible(long timeout);
302 extern long schedule_timeout_killable(long timeout);
303 extern long schedule_timeout_uninterruptible(long timeout);
304 extern long schedule_timeout_idle(long timeout);
305 asmlinkage void schedule(void);
306 extern void schedule_preempt_disabled(void);
307 asmlinkage void preempt_schedule_irq(void);
308 #ifdef CONFIG_PREEMPT_RT
309 extern void schedule_rtlock(void);
312 extern int __must_check io_schedule_prepare(void);
313 extern void io_schedule_finish(int token);
314 extern long io_schedule_timeout(long timeout);
315 extern void io_schedule(void);
318 * struct prev_cputime - snapshot of system and user cputime
319 * @utime: time spent in user mode
320 * @stime: time spent in system mode
321 * @lock: protects the above two fields
323 * Stores previous user/system time values such that we can guarantee
326 struct prev_cputime {
327 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
335 /* Task is sleeping or running in a CPU with VTIME inactive: */
339 /* Task runs in kernelspace in a CPU with VTIME active: */
341 /* Task runs in userspace in a CPU with VTIME active: */
343 /* Task runs as guests in a CPU with VTIME active: */
349 unsigned long long starttime;
350 enum vtime_state state;
358 * Utilization clamp constraints.
359 * @UCLAMP_MIN: Minimum utilization
360 * @UCLAMP_MAX: Maximum utilization
361 * @UCLAMP_CNT: Utilization clamp constraints count
370 extern struct root_domain def_root_domain;
371 extern struct mutex sched_domains_mutex;
375 #ifdef CONFIG_SCHED_INFO
376 /* Cumulative counters: */
378 /* # of times we have run on this CPU: */
379 unsigned long pcount;
381 /* Time spent waiting on a runqueue: */
382 unsigned long long run_delay;
386 /* When did we last run on a CPU? */
387 unsigned long long last_arrival;
389 /* When were we last queued to run? */
390 unsigned long long last_queued;
392 #endif /* CONFIG_SCHED_INFO */
396 * Integer metrics need fixed point arithmetic, e.g., sched/fair
397 * has a few: load, load_avg, util_avg, freq, and capacity.
399 * We define a basic fixed point arithmetic range, and then formalize
400 * all these metrics based on that basic range.
402 # define SCHED_FIXEDPOINT_SHIFT 10
403 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
405 /* Increase resolution of cpu_capacity calculations */
406 # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT
407 # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
410 unsigned long weight;
415 * struct util_est - Estimation utilization of FAIR tasks
416 * @enqueued: instantaneous estimated utilization of a task/cpu
417 * @ewma: the Exponential Weighted Moving Average (EWMA)
418 * utilization of a task
420 * Support data structure to track an Exponential Weighted Moving Average
421 * (EWMA) of a FAIR task's utilization. New samples are added to the moving
422 * average each time a task completes an activation. Sample's weight is chosen
423 * so that the EWMA will be relatively insensitive to transient changes to the
426 * The enqueued attribute has a slightly different meaning for tasks and cpus:
427 * - task: the task's util_avg at last task dequeue time
428 * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU
429 * Thus, the util_est.enqueued of a task represents the contribution on the
430 * estimated utilization of the CPU where that task is currently enqueued.
432 * Only for tasks we track a moving average of the past instantaneous
433 * estimated utilization. This allows to absorb sporadic drops in utilization
434 * of an otherwise almost periodic task.
436 * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg
437 * updates. When a task is dequeued, its util_est should not be updated if its
438 * util_avg has not been updated in the meantime.
439 * This information is mapped into the MSB bit of util_est.enqueued at dequeue
440 * time. Since max value of util_est.enqueued for a task is 1024 (PELT util_avg
441 * for a task) it is safe to use MSB.
444 unsigned int enqueued;
446 #define UTIL_EST_WEIGHT_SHIFT 2
447 #define UTIL_AVG_UNCHANGED 0x80000000
448 } __attribute__((__aligned__(sizeof(u64))));
451 * The load/runnable/util_avg accumulates an infinite geometric series
452 * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c).
454 * [load_avg definition]
456 * load_avg = runnable% * scale_load_down(load)
458 * [runnable_avg definition]
460 * runnable_avg = runnable% * SCHED_CAPACITY_SCALE
462 * [util_avg definition]
464 * util_avg = running% * SCHED_CAPACITY_SCALE
466 * where runnable% is the time ratio that a sched_entity is runnable and
467 * running% the time ratio that a sched_entity is running.
469 * For cfs_rq, they are the aggregated values of all runnable and blocked
472 * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU
473 * capacity scaling. The scaling is done through the rq_clock_pelt that is used
474 * for computing those signals (see update_rq_clock_pelt())
476 * N.B., the above ratios (runnable% and running%) themselves are in the
477 * range of [0, 1]. To do fixed point arithmetics, we therefore scale them
478 * to as large a range as necessary. This is for example reflected by
479 * util_avg's SCHED_CAPACITY_SCALE.
483 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
484 * with the highest load (=88761), always runnable on a single cfs_rq,
485 * and should not overflow as the number already hits PID_MAX_LIMIT.
487 * For all other cases (including 32-bit kernels), struct load_weight's
488 * weight will overflow first before we do, because:
490 * Max(load_avg) <= Max(load.weight)
492 * Then it is the load_weight's responsibility to consider overflow
496 u64 last_update_time;
501 unsigned long load_avg;
502 unsigned long runnable_avg;
503 unsigned long util_avg;
504 struct util_est util_est;
505 } ____cacheline_aligned;
507 struct sched_statistics {
508 #ifdef CONFIG_SCHEDSTATS
518 s64 sum_sleep_runtime;
522 s64 sum_block_runtime;
527 u64 nr_migrations_cold;
528 u64 nr_failed_migrations_affine;
529 u64 nr_failed_migrations_running;
530 u64 nr_failed_migrations_hot;
531 u64 nr_forced_migrations;
535 u64 nr_wakeups_migrate;
536 u64 nr_wakeups_local;
537 u64 nr_wakeups_remote;
538 u64 nr_wakeups_affine;
539 u64 nr_wakeups_affine_attempts;
540 u64 nr_wakeups_passive;
543 #ifdef CONFIG_SCHED_CORE
544 u64 core_forceidle_sum;
546 #endif /* CONFIG_SCHEDSTATS */
547 } ____cacheline_aligned;
549 struct sched_entity {
550 /* For load-balancing: */
551 struct load_weight load;
552 struct rb_node run_node;
553 struct list_head group_node;
557 u64 sum_exec_runtime;
559 u64 prev_sum_exec_runtime;
563 #ifdef CONFIG_FAIR_GROUP_SCHED
565 struct sched_entity *parent;
566 /* rq on which this entity is (to be) queued: */
567 struct cfs_rq *cfs_rq;
568 /* rq "owned" by this entity/group: */
570 /* cached value of my_q->h_nr_running */
571 unsigned long runnable_weight;
576 * Per entity load average tracking.
578 * Put into separate cache line so it does not
579 * collide with read-mostly values above.
581 struct sched_avg avg;
585 struct sched_rt_entity {
586 struct list_head run_list;
587 unsigned long timeout;
588 unsigned long watchdog_stamp;
589 unsigned int time_slice;
590 unsigned short on_rq;
591 unsigned short on_list;
593 struct sched_rt_entity *back;
594 #ifdef CONFIG_RT_GROUP_SCHED
595 struct sched_rt_entity *parent;
596 /* rq on which this entity is (to be) queued: */
598 /* rq "owned" by this entity/group: */
601 } __randomize_layout;
603 struct sched_dl_entity {
604 struct rb_node rb_node;
607 * Original scheduling parameters. Copied here from sched_attr
608 * during sched_setattr(), they will remain the same until
609 * the next sched_setattr().
611 u64 dl_runtime; /* Maximum runtime for each instance */
612 u64 dl_deadline; /* Relative deadline of each instance */
613 u64 dl_period; /* Separation of two instances (period) */
614 u64 dl_bw; /* dl_runtime / dl_period */
615 u64 dl_density; /* dl_runtime / dl_deadline */
618 * Actual scheduling parameters. Initialized with the values above,
619 * they are continuously updated during task execution. Note that
620 * the remaining runtime could be < 0 in case we are in overrun.
622 s64 runtime; /* Remaining runtime for this instance */
623 u64 deadline; /* Absolute deadline for this instance */
624 unsigned int flags; /* Specifying the scheduler behaviour */
629 * @dl_throttled tells if we exhausted the runtime. If so, the
630 * task has to wait for a replenishment to be performed at the
631 * next firing of dl_timer.
633 * @dl_yielded tells if task gave up the CPU before consuming
634 * all its available runtime during the last job.
636 * @dl_non_contending tells if the task is inactive while still
637 * contributing to the active utilization. In other words, it
638 * indicates if the inactive timer has been armed and its handler
639 * has not been executed yet. This flag is useful to avoid race
640 * conditions between the inactive timer handler and the wakeup
643 * @dl_overrun tells if the task asked to be informed about runtime
646 unsigned int dl_throttled : 1;
647 unsigned int dl_yielded : 1;
648 unsigned int dl_non_contending : 1;
649 unsigned int dl_overrun : 1;
652 * Bandwidth enforcement timer. Each -deadline task has its
653 * own bandwidth to be enforced, thus we need one timer per task.
655 struct hrtimer dl_timer;
658 * Inactive timer, responsible for decreasing the active utilization
659 * at the "0-lag time". When a -deadline task blocks, it contributes
660 * to GRUB's active utilization until the "0-lag time", hence a
661 * timer is needed to decrease the active utilization at the correct
664 struct hrtimer inactive_timer;
666 #ifdef CONFIG_RT_MUTEXES
668 * Priority Inheritance. When a DEADLINE scheduling entity is boosted
669 * pi_se points to the donor, otherwise points to the dl_se it belongs
670 * to (the original one/itself).
672 struct sched_dl_entity *pi_se;
676 #ifdef CONFIG_UCLAMP_TASK
677 /* Number of utilization clamp buckets (shorter alias) */
678 #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT
681 * Utilization clamp for a scheduling entity
682 * @value: clamp value "assigned" to a se
683 * @bucket_id: bucket index corresponding to the "assigned" value
684 * @active: the se is currently refcounted in a rq's bucket
685 * @user_defined: the requested clamp value comes from user-space
687 * The bucket_id is the index of the clamp bucket matching the clamp value
688 * which is pre-computed and stored to avoid expensive integer divisions from
691 * The active bit is set whenever a task has got an "effective" value assigned,
692 * which can be different from the clamp value "requested" from user-space.
693 * This allows to know a task is refcounted in the rq's bucket corresponding
694 * to the "effective" bucket_id.
696 * The user_defined bit is set whenever a task has got a task-specific clamp
697 * value requested from userspace, i.e. the system defaults apply to this task
698 * just as a restriction. This allows to relax default clamps when a less
699 * restrictive task-specific value has been requested, thus allowing to
700 * implement a "nice" semantic. For example, a task running with a 20%
701 * default boost can still drop its own boosting to 0%.
704 unsigned int value : bits_per(SCHED_CAPACITY_SCALE);
705 unsigned int bucket_id : bits_per(UCLAMP_BUCKETS);
706 unsigned int active : 1;
707 unsigned int user_defined : 1;
709 #endif /* CONFIG_UCLAMP_TASK */
715 u8 exp_hint; /* Hint for performance. */
716 u8 need_mb; /* Readers need smp_mb(). */
718 u32 s; /* Set of bits. */
721 enum perf_event_task_context {
722 perf_invalid_context = -1,
725 perf_nr_task_contexts,
729 struct wake_q_node *next;
733 #ifdef CONFIG_KMAP_LOCAL
735 pte_t pteval[KM_MAX_IDX];
740 #ifdef CONFIG_THREAD_INFO_IN_TASK
742 * For reasons of header soup (see current_thread_info()), this
743 * must be the first element of task_struct.
745 struct thread_info thread_info;
747 unsigned int __state;
749 #ifdef CONFIG_PREEMPT_RT
750 /* saved state for "spinlock sleepers" */
751 unsigned int saved_state;
755 * This begins the randomizable portion of task_struct. Only
756 * scheduling-critical items should be added above here.
758 randomized_struct_fields_start
762 /* Per task flags (PF_*), defined further below: */
768 struct __call_single_node wake_entry;
769 unsigned int wakee_flips;
770 unsigned long wakee_flip_decay_ts;
771 struct task_struct *last_wakee;
774 * recent_used_cpu is initially set as the last CPU used by a task
775 * that wakes affine another task. Waker/wakee relationships can
776 * push tasks around a CPU where each wakeup moves to the next one.
777 * Tracking a recently used CPU allows a quick search for a recently
778 * used CPU that may be idle.
788 unsigned int rt_priority;
790 struct sched_entity se;
791 struct sched_rt_entity rt;
792 struct sched_dl_entity dl;
793 const struct sched_class *sched_class;
795 #ifdef CONFIG_SCHED_CORE
796 struct rb_node core_node;
797 unsigned long core_cookie;
798 unsigned int core_occupation;
801 #ifdef CONFIG_CGROUP_SCHED
802 struct task_group *sched_task_group;
805 #ifdef CONFIG_UCLAMP_TASK
807 * Clamp values requested for a scheduling entity.
808 * Must be updated with task_rq_lock() held.
810 struct uclamp_se uclamp_req[UCLAMP_CNT];
812 * Effective clamp values used for a scheduling entity.
813 * Must be updated with task_rq_lock() held.
815 struct uclamp_se uclamp[UCLAMP_CNT];
818 struct sched_statistics stats;
820 #ifdef CONFIG_PREEMPT_NOTIFIERS
821 /* List of struct preempt_notifier: */
822 struct hlist_head preempt_notifiers;
825 #ifdef CONFIG_BLK_DEV_IO_TRACE
826 unsigned int btrace_seq;
831 const cpumask_t *cpus_ptr;
832 cpumask_t *user_cpus_ptr;
834 void *migration_pending;
836 unsigned short migration_disabled;
838 unsigned short migration_flags;
840 #ifdef CONFIG_PREEMPT_RCU
841 int rcu_read_lock_nesting;
842 union rcu_special rcu_read_unlock_special;
843 struct list_head rcu_node_entry;
844 struct rcu_node *rcu_blocked_node;
845 #endif /* #ifdef CONFIG_PREEMPT_RCU */
847 #ifdef CONFIG_TASKS_RCU
848 unsigned long rcu_tasks_nvcsw;
849 u8 rcu_tasks_holdout;
851 int rcu_tasks_idle_cpu;
852 struct list_head rcu_tasks_holdout_list;
853 #endif /* #ifdef CONFIG_TASKS_RCU */
855 #ifdef CONFIG_TASKS_TRACE_RCU
856 int trc_reader_nesting;
858 union rcu_special trc_reader_special;
859 struct list_head trc_holdout_list;
860 struct list_head trc_blkd_node;
862 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
864 struct sched_info sched_info;
866 struct list_head tasks;
868 struct plist_node pushable_tasks;
869 struct rb_node pushable_dl_tasks;
872 struct mm_struct *mm;
873 struct mm_struct *active_mm;
878 /* The signal sent when the parent dies: */
880 /* JOBCTL_*, siglock protected: */
881 unsigned long jobctl;
883 /* Used for emulating ABI behavior of previous Linux versions: */
884 unsigned int personality;
886 /* Scheduler bits, serialized by scheduler locks: */
887 unsigned sched_reset_on_fork:1;
888 unsigned sched_contributes_to_load:1;
889 unsigned sched_migrated:1;
891 /* Force alignment to the next boundary: */
894 /* Unserialized, strictly 'current' */
897 * This field must not be in the scheduler word above due to wakelist
898 * queueing no longer being serialized by p->on_cpu. However:
901 * schedule() if (p->on_rq && ..) // false
902 * smp_mb__after_spinlock(); if (smp_load_acquire(&p->on_cpu) && //true
903 * deactivate_task() ttwu_queue_wakelist())
904 * p->on_rq = 0; p->sched_remote_wakeup = Y;
906 * guarantees all stores of 'current' are visible before
907 * ->sched_remote_wakeup gets used, so it can be in this word.
909 unsigned sched_remote_wakeup:1;
911 /* Bit to tell LSMs we're in execve(): */
912 unsigned in_execve:1;
913 unsigned in_iowait:1;
914 #ifndef TIF_RESTORE_SIGMASK
915 unsigned restore_sigmask:1;
918 unsigned in_user_fault:1;
920 #ifdef CONFIG_LRU_GEN
921 /* whether the LRU algorithm may apply to this access */
922 unsigned in_lru_fault:1;
924 #ifdef CONFIG_COMPAT_BRK
925 unsigned brk_randomized:1;
927 #ifdef CONFIG_CGROUPS
928 /* disallow userland-initiated cgroup migration */
929 unsigned no_cgroup_migration:1;
930 /* task is frozen/stopped (used by the cgroup freezer) */
933 #ifdef CONFIG_BLK_CGROUP
934 unsigned use_memdelay:1;
937 /* Stalled due to lack of memory */
938 unsigned in_memstall:1;
940 #ifdef CONFIG_PAGE_OWNER
941 /* Used by page_owner=on to detect recursion in page tracking. */
942 unsigned in_page_owner:1;
944 #ifdef CONFIG_EVENTFD
945 /* Recursion prevention for eventfd_signal() */
946 unsigned in_eventfd:1;
948 #ifdef CONFIG_IOMMU_SVA
949 unsigned pasid_activated:1;
951 #ifdef CONFIG_CPU_SUP_INTEL
952 unsigned reported_split_lock:1;
954 #ifdef CONFIG_TASK_DELAY_ACCT
955 /* delay due to memory thrashing */
956 unsigned in_thrashing:1;
959 unsigned long atomic_flags; /* Flags requiring atomic access. */
961 struct restart_block restart_block;
966 #ifdef CONFIG_STACKPROTECTOR
967 /* Canary value for the -fstack-protector GCC feature: */
968 unsigned long stack_canary;
971 * Pointers to the (original) parent process, youngest child, younger sibling,
972 * older sibling, respectively. (p->father can be replaced with
973 * p->real_parent->pid)
976 /* Real parent process: */
977 struct task_struct __rcu *real_parent;
979 /* Recipient of SIGCHLD, wait4() reports: */
980 struct task_struct __rcu *parent;
983 * Children/sibling form the list of natural children:
985 struct list_head children;
986 struct list_head sibling;
987 struct task_struct *group_leader;
990 * 'ptraced' is the list of tasks this task is using ptrace() on.
992 * This includes both natural children and PTRACE_ATTACH targets.
993 * 'ptrace_entry' is this task's link on the p->parent->ptraced list.
995 struct list_head ptraced;
996 struct list_head ptrace_entry;
998 /* PID/PID hash table linkage. */
999 struct pid *thread_pid;
1000 struct hlist_node pid_links[PIDTYPE_MAX];
1001 struct list_head thread_group;
1002 struct list_head thread_node;
1004 struct completion *vfork_done;
1006 /* CLONE_CHILD_SETTID: */
1007 int __user *set_child_tid;
1009 /* CLONE_CHILD_CLEARTID: */
1010 int __user *clear_child_tid;
1012 /* PF_KTHREAD | PF_IO_WORKER */
1013 void *worker_private;
1017 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1022 struct prev_cputime prev_cputime;
1023 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1027 #ifdef CONFIG_NO_HZ_FULL
1028 atomic_t tick_dep_mask;
1030 /* Context switch counts: */
1031 unsigned long nvcsw;
1032 unsigned long nivcsw;
1034 /* Monotonic time in nsecs: */
1037 /* Boot based time in nsecs: */
1040 /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
1041 unsigned long min_flt;
1042 unsigned long maj_flt;
1044 /* Empty if CONFIG_POSIX_CPUTIMERS=n */
1045 struct posix_cputimers posix_cputimers;
1047 #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
1048 struct posix_cputimers_work posix_cputimers_work;
1051 /* Process credentials: */
1053 /* Tracer's credentials at attach: */
1054 const struct cred __rcu *ptracer_cred;
1056 /* Objective and real subjective task credentials (COW): */
1057 const struct cred __rcu *real_cred;
1059 /* Effective (overridable) subjective task credentials (COW): */
1060 const struct cred __rcu *cred;
1063 /* Cached requested key. */
1064 struct key *cached_requested_key;
1068 * executable name, excluding path.
1070 * - normally initialized setup_new_exec()
1071 * - access it with [gs]et_task_comm()
1072 * - lock it with task_lock()
1074 char comm[TASK_COMM_LEN];
1076 struct nameidata *nameidata;
1078 #ifdef CONFIG_SYSVIPC
1079 struct sysv_sem sysvsem;
1080 struct sysv_shm sysvshm;
1082 #ifdef CONFIG_DETECT_HUNG_TASK
1083 unsigned long last_switch_count;
1084 unsigned long last_switch_time;
1086 /* Filesystem information: */
1087 struct fs_struct *fs;
1089 /* Open file information: */
1090 struct files_struct *files;
1092 #ifdef CONFIG_IO_URING
1093 struct io_uring_task *io_uring;
1097 struct nsproxy *nsproxy;
1099 /* Signal handlers: */
1100 struct signal_struct *signal;
1101 struct sighand_struct __rcu *sighand;
1103 sigset_t real_blocked;
1104 /* Restored if set_restore_sigmask() was used: */
1105 sigset_t saved_sigmask;
1106 struct sigpending pending;
1107 unsigned long sas_ss_sp;
1109 unsigned int sas_ss_flags;
1111 struct callback_head *task_works;
1114 #ifdef CONFIG_AUDITSYSCALL
1115 struct audit_context *audit_context;
1118 unsigned int sessionid;
1120 struct seccomp seccomp;
1121 struct syscall_user_dispatch syscall_dispatch;
1123 /* Thread group tracking: */
1127 /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
1128 spinlock_t alloc_lock;
1130 /* Protection of the PI data structures: */
1131 raw_spinlock_t pi_lock;
1133 struct wake_q_node wake_q;
1135 #ifdef CONFIG_RT_MUTEXES
1136 /* PI waiters blocked on a rt_mutex held by this task: */
1137 struct rb_root_cached pi_waiters;
1138 /* Updated under owner's pi_lock and rq lock */
1139 struct task_struct *pi_top_task;
1140 /* Deadlock detection and priority inheritance handling: */
1141 struct rt_mutex_waiter *pi_blocked_on;
1144 #ifdef CONFIG_DEBUG_MUTEXES
1145 /* Mutex deadlock detection: */
1146 struct mutex_waiter *blocked_on;
1149 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1150 int non_block_count;
1153 #ifdef CONFIG_TRACE_IRQFLAGS
1154 struct irqtrace_events irqtrace;
1155 unsigned int hardirq_threaded;
1156 u64 hardirq_chain_key;
1157 int softirqs_enabled;
1158 int softirq_context;
1161 #ifdef CONFIG_PREEMPT_RT
1162 int softirq_disable_cnt;
1165 #ifdef CONFIG_LOCKDEP
1166 # define MAX_LOCK_DEPTH 48UL
1169 unsigned int lockdep_recursion;
1170 struct held_lock held_locks[MAX_LOCK_DEPTH];
1173 #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
1174 unsigned int in_ubsan;
1177 /* Journalling filesystem info: */
1180 /* Stacked block device info: */
1181 struct bio_list *bio_list;
1183 /* Stack plugging: */
1184 struct blk_plug *plug;
1187 struct reclaim_state *reclaim_state;
1189 struct backing_dev_info *backing_dev_info;
1191 struct io_context *io_context;
1193 #ifdef CONFIG_COMPACTION
1194 struct capture_control *capture_control;
1197 unsigned long ptrace_message;
1198 kernel_siginfo_t *last_siginfo;
1200 struct task_io_accounting ioac;
1202 /* Pressure stall state */
1203 unsigned int psi_flags;
1205 #ifdef CONFIG_TASK_XACCT
1206 /* Accumulated RSS usage: */
1208 /* Accumulated virtual memory usage: */
1210 /* stime + utime since last update: */
1213 #ifdef CONFIG_CPUSETS
1214 /* Protected by ->alloc_lock: */
1215 nodemask_t mems_allowed;
1216 /* Sequence number to catch updates: */
1217 seqcount_spinlock_t mems_allowed_seq;
1218 int cpuset_mem_spread_rotor;
1219 int cpuset_slab_spread_rotor;
1221 #ifdef CONFIG_CGROUPS
1222 /* Control Group info protected by css_set_lock: */
1223 struct css_set __rcu *cgroups;
1224 /* cg_list protected by css_set_lock and tsk->alloc_lock: */
1225 struct list_head cg_list;
1227 #ifdef CONFIG_X86_CPU_RESCTRL
1232 struct robust_list_head __user *robust_list;
1233 #ifdef CONFIG_COMPAT
1234 struct compat_robust_list_head __user *compat_robust_list;
1236 struct list_head pi_state_list;
1237 struct futex_pi_state *pi_state_cache;
1238 struct mutex futex_exit_mutex;
1239 unsigned int futex_state;
1241 #ifdef CONFIG_PERF_EVENTS
1242 struct perf_event_context *perf_event_ctxp;
1243 struct mutex perf_event_mutex;
1244 struct list_head perf_event_list;
1246 #ifdef CONFIG_DEBUG_PREEMPT
1247 unsigned long preempt_disable_ip;
1250 /* Protected by alloc_lock: */
1251 struct mempolicy *mempolicy;
1253 short pref_node_fork;
1255 #ifdef CONFIG_NUMA_BALANCING
1257 unsigned int numa_scan_period;
1258 unsigned int numa_scan_period_max;
1259 int numa_preferred_nid;
1260 unsigned long numa_migrate_retry;
1261 /* Migration stamp: */
1263 u64 last_task_numa_placement;
1264 u64 last_sum_exec_runtime;
1265 struct callback_head numa_work;
1268 * This pointer is only modified for current in syscall and
1269 * pagefault context (and for tasks being destroyed), so it can be read
1270 * from any of the following contexts:
1271 * - RCU read-side critical section
1272 * - current->numa_group from everywhere
1273 * - task's runqueue locked, task not running
1275 struct numa_group __rcu *numa_group;
1278 * numa_faults is an array split into four regions:
1279 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1280 * in this precise order.
1282 * faults_memory: Exponential decaying average of faults on a per-node
1283 * basis. Scheduling placement decisions are made based on these
1284 * counts. The values remain static for the duration of a PTE scan.
1285 * faults_cpu: Track the nodes the process was running on when a NUMA
1286 * hinting fault was incurred.
1287 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1288 * during the current scan window. When the scan completes, the counts
1289 * in faults_memory and faults_cpu decay and these values are copied.
1291 unsigned long *numa_faults;
1292 unsigned long total_numa_faults;
1295 * numa_faults_locality tracks if faults recorded during the last
1296 * scan window were remote/local or failed to migrate. The task scan
1297 * period is adapted based on the locality of the faults with different
1298 * weights depending on whether they were shared or private faults
1300 unsigned long numa_faults_locality[3];
1302 unsigned long numa_pages_migrated;
1303 #endif /* CONFIG_NUMA_BALANCING */
1306 struct rseq __user *rseq;
1310 * RmW on rseq_event_mask must be performed atomically
1311 * with respect to preemption.
1313 unsigned long rseq_event_mask;
1316 #ifdef CONFIG_SCHED_MM_CID
1317 int mm_cid; /* Current cid in mm */
1318 int last_mm_cid; /* Most recent cid in mm */
1319 int migrate_from_cpu;
1320 int mm_cid_active; /* Whether cid bitmap is active */
1321 struct callback_head cid_work;
1324 struct tlbflush_unmap_batch tlb_ubc;
1326 /* Cache last used pipe for splice(): */
1327 struct pipe_inode_info *splice_pipe;
1329 struct page_frag task_frag;
1331 #ifdef CONFIG_TASK_DELAY_ACCT
1332 struct task_delay_info *delays;
1335 #ifdef CONFIG_FAULT_INJECTION
1337 unsigned int fail_nth;
1340 * When (nr_dirtied >= nr_dirtied_pause), it's time to call
1341 * balance_dirty_pages() for a dirty throttling pause:
1344 int nr_dirtied_pause;
1345 /* Start of a write-and-pause period: */
1346 unsigned long dirty_paused_when;
1348 #ifdef CONFIG_LATENCYTOP
1349 int latency_record_count;
1350 struct latency_record latency_record[LT_SAVECOUNT];
1353 * Time slack values; these are used to round up poll() and
1354 * select() etc timeout values. These are in nanoseconds.
1357 u64 default_timer_slack_ns;
1359 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
1360 unsigned int kasan_depth;
1364 struct kcsan_ctx kcsan_ctx;
1365 #ifdef CONFIG_TRACE_IRQFLAGS
1366 struct irqtrace_events kcsan_save_irqtrace;
1368 #ifdef CONFIG_KCSAN_WEAK_MEMORY
1369 int kcsan_stack_depth;
1374 struct kmsan_ctx kmsan_ctx;
1377 #if IS_ENABLED(CONFIG_KUNIT)
1378 struct kunit *kunit_test;
1381 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1382 /* Index of current stored address in ret_stack: */
1386 /* Stack of return addresses for return function tracing: */
1387 struct ftrace_ret_stack *ret_stack;
1389 /* Timestamp for last schedule: */
1390 unsigned long long ftrace_timestamp;
1393 * Number of functions that haven't been traced
1394 * because of depth overrun:
1396 atomic_t trace_overrun;
1398 /* Pause tracing: */
1399 atomic_t tracing_graph_pause;
1402 #ifdef CONFIG_TRACING
1403 /* Bitmask and counter of trace recursion: */
1404 unsigned long trace_recursion;
1405 #endif /* CONFIG_TRACING */
1408 /* See kernel/kcov.c for more details. */
1410 /* Coverage collection mode enabled for this task (0 if disabled): */
1411 unsigned int kcov_mode;
1413 /* Size of the kcov_area: */
1414 unsigned int kcov_size;
1416 /* Buffer for coverage collection: */
1419 /* KCOV descriptor wired with this task or NULL: */
1422 /* KCOV common handle for remote coverage collection: */
1425 /* KCOV sequence number: */
1428 /* Collect coverage from softirq context: */
1429 unsigned int kcov_softirq;
1433 struct mem_cgroup *memcg_in_oom;
1434 gfp_t memcg_oom_gfp_mask;
1435 int memcg_oom_order;
1437 /* Number of pages to reclaim on returning to userland: */
1438 unsigned int memcg_nr_pages_over_high;
1440 /* Used by memcontrol for targeted memcg charge: */
1441 struct mem_cgroup *active_memcg;
1444 #ifdef CONFIG_BLK_CGROUP
1445 struct gendisk *throttle_disk;
1448 #ifdef CONFIG_UPROBES
1449 struct uprobe_task *utask;
1451 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1452 unsigned int sequential_io;
1453 unsigned int sequential_io_avg;
1455 struct kmap_ctrl kmap_ctrl;
1456 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1457 unsigned long task_state_change;
1458 # ifdef CONFIG_PREEMPT_RT
1459 unsigned long saved_state_change;
1462 struct rcu_head rcu;
1463 refcount_t rcu_users;
1464 int pagefault_disabled;
1466 struct task_struct *oom_reaper_list;
1467 struct timer_list oom_reaper_timer;
1469 #ifdef CONFIG_VMAP_STACK
1470 struct vm_struct *stack_vm_area;
1472 #ifdef CONFIG_THREAD_INFO_IN_TASK
1473 /* A live task holds one reference: */
1474 refcount_t stack_refcount;
1476 #ifdef CONFIG_LIVEPATCH
1479 #ifdef CONFIG_SECURITY
1480 /* Used by LSM modules for access restriction: */
1483 #ifdef CONFIG_BPF_SYSCALL
1484 /* Used by BPF task local storage */
1485 struct bpf_local_storage __rcu *bpf_storage;
1486 /* Used for BPF run context */
1487 struct bpf_run_ctx *bpf_ctx;
1490 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
1491 unsigned long lowest_stack;
1492 unsigned long prev_lowest_stack;
1495 #ifdef CONFIG_X86_MCE
1496 void __user *mce_vaddr;
1501 __mce_reserved : 62;
1502 struct callback_head mce_kill_me;
1506 #ifdef CONFIG_KRETPROBES
1507 struct llist_head kretprobe_instances;
1509 #ifdef CONFIG_RETHOOK
1510 struct llist_head rethooks;
1513 #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
1515 * If L1D flush is supported on mm context switch
1516 * then we use this callback head to queue kill work
1517 * to kill tasks that are not running on SMT disabled
1520 struct callback_head l1d_flush_kill;
1525 * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS.
1526 * If we find justification for more monitors, we can think
1527 * about adding more or developing a dynamic method. So far,
1528 * none of these are justified.
1530 union rv_task_monitor rv[RV_PER_TASK_MONITORS];
1533 #ifdef CONFIG_USER_EVENTS
1534 struct user_event_mm *user_event_mm;
1538 * New fields for task_struct should be added above here, so that
1539 * they are included in the randomized portion of task_struct.
1541 randomized_struct_fields_end
1543 /* CPU-specific state of this task: */
1544 struct thread_struct thread;
1547 * WARNING: on x86, 'thread_struct' contains a variable-sized
1548 * structure. It *MUST* be at the end of 'task_struct'.
1550 * Do not put anything below here!
1554 static inline struct pid *task_pid(struct task_struct *task)
1556 return task->thread_pid;
1560 * the helpers to get the task's different pids as they are seen
1561 * from various namespaces
1563 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1564 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1566 * task_xid_nr_ns() : id seen from the ns specified;
1568 * see also pid_nr() etc in include/linux/pid.h
1570 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);
1572 static inline pid_t task_pid_nr(struct task_struct *tsk)
1577 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1579 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1582 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1584 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1588 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1594 * pid_alive - check that a task structure is not stale
1595 * @p: Task structure to be checked.
1597 * Test if a process is not yet dead (at most zombie state)
1598 * If pid_alive fails, then pointers within the task structure
1599 * can be stale and must not be dereferenced.
1601 * Return: 1 if the process is alive. 0 otherwise.
1603 static inline int pid_alive(const struct task_struct *p)
1605 return p->thread_pid != NULL;
1608 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1610 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1613 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1615 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1619 static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1621 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1624 static inline pid_t task_session_vnr(struct task_struct *tsk)
1626 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1629 static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
1631 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns);
1634 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1636 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL);
1639 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
1645 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
1651 static inline pid_t task_ppid_nr(const struct task_struct *tsk)
1653 return task_ppid_nr_ns(tsk, &init_pid_ns);
1656 /* Obsolete, do not use: */
1657 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1659 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1662 #define TASK_REPORT_IDLE (TASK_REPORT + 1)
1663 #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1)
1665 static inline unsigned int __task_state_index(unsigned int tsk_state,
1666 unsigned int tsk_exit_state)
1668 unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT;
1670 BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
1672 if (tsk_state == TASK_IDLE)
1673 state = TASK_REPORT_IDLE;
1676 * We're lying here, but rather than expose a completely new task state
1677 * to userspace, we can make this appear as if the task has gone through
1678 * a regular rt_mutex_lock() call.
1680 if (tsk_state == TASK_RTLOCK_WAIT)
1681 state = TASK_UNINTERRUPTIBLE;
1686 static inline unsigned int task_state_index(struct task_struct *tsk)
1688 return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state);
1691 static inline char task_index_to_char(unsigned int state)
1693 static const char state_char[] = "RSDTtXZPI";
1695 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
1697 return state_char[state];
1700 static inline char task_state_to_char(struct task_struct *tsk)
1702 return task_index_to_char(task_state_index(tsk));
1706 * is_global_init - check if a task structure is init. Since init
1707 * is free to have sub-threads we need to check tgid.
1708 * @tsk: Task structure to be checked.
1710 * Check if a task structure is the first user space task the kernel created.
1712 * Return: 1 if the task structure is init. 0 otherwise.
1714 static inline int is_global_init(struct task_struct *tsk)
1716 return task_tgid_nr(tsk) == 1;
1719 extern struct pid *cad_pid;
1724 #define PF_VCPU 0x00000001 /* I'm a virtual CPU */
1725 #define PF_IDLE 0x00000002 /* I am an IDLE thread */
1726 #define PF_EXITING 0x00000004 /* Getting shut down */
1727 #define PF_POSTCOREDUMP 0x00000008 /* Coredumps should ignore this task */
1728 #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */
1729 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1730 #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
1731 #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */
1732 #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */
1733 #define PF_DUMPCORE 0x00000200 /* Dumped core */
1734 #define PF_SIGNALED 0x00000400 /* Killed by a signal */
1735 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1736 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */
1737 #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */
1738 #define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */
1739 #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */
1740 #define PF__HOLE__00010000 0x00010000
1741 #define PF_KSWAPD 0x00020000 /* I am kswapd */
1742 #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */
1743 #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */
1744 #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to,
1745 * I am cleaning dirty pages from some other bdi. */
1746 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1747 #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */
1748 #define PF__HOLE__00800000 0x00800000
1749 #define PF__HOLE__01000000 0x01000000
1750 #define PF__HOLE__02000000 0x02000000
1751 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
1752 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1753 #define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */
1754 #define PF__HOLE__20000000 0x20000000
1755 #define PF__HOLE__40000000 0x40000000
1756 #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
1759 * Only the _current_ task can read/write to tsk->flags, but other
1760 * tasks can access tsk->flags in readonly mode for example
1761 * with tsk_used_math (like during threaded core dumping).
1762 * There is however an exception to this rule during ptrace
1763 * or during fork: the ptracer task is allowed to write to the
1764 * child->flags of its traced child (same goes for fork, the parent
1765 * can write to the child->flags), because we're guaranteed the
1766 * child is not running and in turn not changing child->flags
1767 * at the same time the parent does it.
1769 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1770 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1771 #define clear_used_math() clear_stopped_child_used_math(current)
1772 #define set_used_math() set_stopped_child_used_math(current)
1774 #define conditional_stopped_child_used_math(condition, child) \
1775 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1777 #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current)
1779 #define copy_to_stopped_child_used_math(child) \
1780 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1782 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1783 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1784 #define used_math() tsk_used_math(current)
1786 static __always_inline bool is_percpu_thread(void)
1789 return (current->flags & PF_NO_SETAFFINITY) &&
1790 (current->nr_cpus_allowed == 1);
1796 /* Per-process atomic flags. */
1797 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */
1798 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */
1799 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */
1800 #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */
1801 #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/
1802 #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */
1803 #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */
1804 #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */
1806 #define TASK_PFA_TEST(name, func) \
1807 static inline bool task_##func(struct task_struct *p) \
1808 { return test_bit(PFA_##name, &p->atomic_flags); }
1810 #define TASK_PFA_SET(name, func) \
1811 static inline void task_set_##func(struct task_struct *p) \
1812 { set_bit(PFA_##name, &p->atomic_flags); }
1814 #define TASK_PFA_CLEAR(name, func) \
1815 static inline void task_clear_##func(struct task_struct *p) \
1816 { clear_bit(PFA_##name, &p->atomic_flags); }
1818 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
1819 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
1821 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
1822 TASK_PFA_SET(SPREAD_PAGE, spread_page)
1823 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
1825 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
1826 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
1827 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
1829 TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
1830 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
1831 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
1833 TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1834 TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1835 TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1837 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1838 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1840 TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable)
1841 TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable)
1842 TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable)
1844 TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1845 TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1848 current_restore_flags(unsigned long orig_flags, unsigned long flags)
1850 current->flags &= ~flags;
1851 current->flags |= orig_flags & flags;
1854 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
1855 extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_effective_cpus);
1857 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
1858 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
1859 extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
1860 extern void release_user_cpus_ptr(struct task_struct *p);
1861 extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask);
1862 extern void force_compatible_cpus_allowed_ptr(struct task_struct *p);
1863 extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p);
1865 static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
1868 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
1870 if (!cpumask_test_cpu(0, new_mask))
1874 static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node)
1876 if (src->user_cpus_ptr)
1880 static inline void release_user_cpus_ptr(struct task_struct *p)
1882 WARN_ON(p->user_cpus_ptr);
1885 static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask)
1891 extern int yield_to(struct task_struct *p, bool preempt);
1892 extern void set_user_nice(struct task_struct *p, long nice);
1893 extern int task_prio(const struct task_struct *p);
1896 * task_nice - return the nice value of a given task.
1897 * @p: the task in question.
1899 * Return: The nice value [ -20 ... 0 ... 19 ].
1901 static inline int task_nice(const struct task_struct *p)
1903 return PRIO_TO_NICE((p)->static_prio);
1906 extern int can_nice(const struct task_struct *p, const int nice);
1907 extern int task_curr(const struct task_struct *p);
1908 extern int idle_cpu(int cpu);
1909 extern int available_idle_cpu(int cpu);
1910 extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
1911 extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
1912 extern void sched_set_fifo(struct task_struct *p);
1913 extern void sched_set_fifo_low(struct task_struct *p);
1914 extern void sched_set_normal(struct task_struct *p, int nice);
1915 extern int sched_setattr(struct task_struct *, const struct sched_attr *);
1916 extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
1917 extern struct task_struct *idle_task(int cpu);
1920 * is_idle_task - is the specified task an idle task?
1921 * @p: the task in question.
1923 * Return: 1 if @p is an idle task. 0 otherwise.
1925 static __always_inline bool is_idle_task(const struct task_struct *p)
1927 return !!(p->flags & PF_IDLE);
1930 extern struct task_struct *curr_task(int cpu);
1931 extern void ia64_set_curr_task(int cpu, struct task_struct *p);
1935 union thread_union {
1936 #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK
1937 struct task_struct task;
1939 #ifndef CONFIG_THREAD_INFO_IN_TASK
1940 struct thread_info thread_info;
1942 unsigned long stack[THREAD_SIZE/sizeof(long)];
1945 #ifndef CONFIG_THREAD_INFO_IN_TASK
1946 extern struct thread_info init_thread_info;
1949 extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)];
1951 #ifdef CONFIG_THREAD_INFO_IN_TASK
1952 # define task_thread_info(task) (&(task)->thread_info)
1953 #elif !defined(__HAVE_THREAD_FUNCTIONS)
1954 # define task_thread_info(task) ((struct thread_info *)(task)->stack)
1958 * find a task by one of its numerical ids
1960 * find_task_by_pid_ns():
1961 * finds a task by its pid in the specified namespace
1962 * find_task_by_vpid():
1963 * finds a task by its virtual pid
1965 * see also find_vpid() etc in include/linux/pid.h
1968 extern struct task_struct *find_task_by_vpid(pid_t nr);
1969 extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
1972 * find a task by its virtual pid and get the task struct
1974 extern struct task_struct *find_get_task_by_vpid(pid_t nr);
1976 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1977 extern int wake_up_process(struct task_struct *tsk);
1978 extern void wake_up_new_task(struct task_struct *tsk);
1981 extern void kick_process(struct task_struct *tsk);
1983 static inline void kick_process(struct task_struct *tsk) { }
1986 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
1988 static inline void set_task_comm(struct task_struct *tsk, const char *from)
1990 __set_task_comm(tsk, from, false);
1993 extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk);
1994 #define get_task_comm(buf, tsk) ({ \
1995 BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \
1996 __get_task_comm(buf, sizeof(buf), tsk); \
2000 static __always_inline void scheduler_ipi(void)
2003 * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting
2004 * TIF_NEED_RESCHED remotely (for the first time) will also send
2007 preempt_fold_need_resched();
2009 extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
2011 static inline void scheduler_ipi(void) { }
2012 static inline unsigned long wait_task_inactive(struct task_struct *p, unsigned int match_state)
2019 * Set thread flags in other task's structures.
2020 * See asm/thread_info.h for TIF_xxxx flags available:
2022 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2024 set_ti_thread_flag(task_thread_info(tsk), flag);
2027 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2029 clear_ti_thread_flag(task_thread_info(tsk), flag);
2032 static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
2035 update_ti_thread_flag(task_thread_info(tsk), flag, value);
2038 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2040 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2043 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2045 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2048 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2050 return test_ti_thread_flag(task_thread_info(tsk), flag);
2053 static inline void set_tsk_need_resched(struct task_struct *tsk)
2055 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2058 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2060 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2063 static inline int test_tsk_need_resched(struct task_struct *tsk)
2065 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2069 * cond_resched() and cond_resched_lock(): latency reduction via
2070 * explicit rescheduling in places that are safe. The return
2071 * value indicates whether a reschedule was done in fact.
2072 * cond_resched_lock() will drop the spinlock before scheduling,
2074 #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
2075 extern int __cond_resched(void);
2077 #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)
2079 void sched_dynamic_klp_enable(void);
2080 void sched_dynamic_klp_disable(void);
2082 DECLARE_STATIC_CALL(cond_resched, __cond_resched);
2084 static __always_inline int _cond_resched(void)
2086 return static_call_mod(cond_resched)();
2089 #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
2091 extern int dynamic_cond_resched(void);
2093 static __always_inline int _cond_resched(void)
2095 return dynamic_cond_resched();
2098 #else /* !CONFIG_PREEMPTION */
2100 static inline int _cond_resched(void)
2102 klp_sched_try_switch();
2103 return __cond_resched();
2106 #endif /* PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_CALL */
2108 #else /* CONFIG_PREEMPTION && !CONFIG_PREEMPT_DYNAMIC */
2110 static inline int _cond_resched(void)
2112 klp_sched_try_switch();
2116 #endif /* !CONFIG_PREEMPTION || CONFIG_PREEMPT_DYNAMIC */
2118 #define cond_resched() ({ \
2119 __might_resched(__FILE__, __LINE__, 0); \
2123 extern int __cond_resched_lock(spinlock_t *lock);
2124 extern int __cond_resched_rwlock_read(rwlock_t *lock);
2125 extern int __cond_resched_rwlock_write(rwlock_t *lock);
2127 #define MIGHT_RESCHED_RCU_SHIFT 8
2128 #define MIGHT_RESCHED_PREEMPT_MASK ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1)
2130 #ifndef CONFIG_PREEMPT_RT
2132 * Non RT kernels have an elevated preempt count due to the held lock,
2133 * but are not allowed to be inside a RCU read side critical section
2135 # define PREEMPT_LOCK_RESCHED_OFFSETS PREEMPT_LOCK_OFFSET
2138 * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in
2139 * cond_resched*lock() has to take that into account because it checks for
2140 * preempt_count() and rcu_preempt_depth().
2142 # define PREEMPT_LOCK_RESCHED_OFFSETS \
2143 (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT))
2146 #define cond_resched_lock(lock) ({ \
2147 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2148 __cond_resched_lock(lock); \
2151 #define cond_resched_rwlock_read(lock) ({ \
2152 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2153 __cond_resched_rwlock_read(lock); \
2156 #define cond_resched_rwlock_write(lock) ({ \
2157 __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS); \
2158 __cond_resched_rwlock_write(lock); \
2161 static inline void cond_resched_rcu(void)
2163 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
2170 #ifdef CONFIG_PREEMPT_DYNAMIC
2172 extern bool preempt_model_none(void);
2173 extern bool preempt_model_voluntary(void);
2174 extern bool preempt_model_full(void);
2178 static inline bool preempt_model_none(void)
2180 return IS_ENABLED(CONFIG_PREEMPT_NONE);
2182 static inline bool preempt_model_voluntary(void)
2184 return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY);
2186 static inline bool preempt_model_full(void)
2188 return IS_ENABLED(CONFIG_PREEMPT);
2193 static inline bool preempt_model_rt(void)
2195 return IS_ENABLED(CONFIG_PREEMPT_RT);
2199 * Does the preemption model allow non-cooperative preemption?
2201 * For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with
2202 * CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the
2203 * kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the
2204 * PREEMPT_NONE model.
2206 static inline bool preempt_model_preemptible(void)
2208 return preempt_model_full() || preempt_model_rt();
2212 * Does a critical section need to be broken due to another
2213 * task waiting?: (technically does not depend on CONFIG_PREEMPTION,
2214 * but a general need for low latency)
2216 static inline int spin_needbreak(spinlock_t *lock)
2218 #ifdef CONFIG_PREEMPTION
2219 return spin_is_contended(lock);
2226 * Check if a rwlock is contended.
2227 * Returns non-zero if there is another task waiting on the rwlock.
2228 * Returns zero if the lock is not contended or the system / underlying
2229 * rwlock implementation does not support contention detection.
2230 * Technically does not depend on CONFIG_PREEMPTION, but a general need
2233 static inline int rwlock_needbreak(rwlock_t *lock)
2235 #ifdef CONFIG_PREEMPTION
2236 return rwlock_is_contended(lock);
2242 static __always_inline bool need_resched(void)
2244 return unlikely(tif_need_resched());
2248 * Wrappers for p->thread_info->cpu access. No-op on UP.
2252 static inline unsigned int task_cpu(const struct task_struct *p)
2254 return READ_ONCE(task_thread_info(p)->cpu);
2257 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2261 static inline unsigned int task_cpu(const struct task_struct *p)
2266 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2270 #endif /* CONFIG_SMP */
2272 extern bool sched_task_on_rq(struct task_struct *p);
2273 extern unsigned long get_wchan(struct task_struct *p);
2274 extern struct task_struct *cpu_curr_snapshot(int cpu);
2277 * In order to reduce various lock holder preemption latencies provide an
2278 * interface to see if a vCPU is currently running or not.
2280 * This allows us to terminate optimistic spin loops and block, analogous to
2281 * the native optimistic spin heuristic of testing if the lock owner task is
2284 #ifndef vcpu_is_preempted
2285 static inline bool vcpu_is_preempted(int cpu)
2291 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2292 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2294 #ifndef TASK_SIZE_OF
2295 #define TASK_SIZE_OF(tsk) TASK_SIZE
2299 static inline bool owner_on_cpu(struct task_struct *owner)
2302 * As lock holder preemption issue, we both skip spinning if
2303 * task is not on cpu or its cpu is preempted
2305 return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner));
2308 /* Returns effective CPU energy utilization, as seen by the scheduler */
2309 unsigned long sched_cpu_util(int cpu);
2310 #endif /* CONFIG_SMP */
2315 * Map the event mask on the user-space ABI enum rseq_cs_flags
2316 * for direct mask checks.
2318 enum rseq_event_mask_bits {
2319 RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT,
2320 RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT,
2321 RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT,
2324 enum rseq_event_mask {
2325 RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT),
2326 RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT),
2327 RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT),
2330 static inline void rseq_set_notify_resume(struct task_struct *t)
2333 set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
2336 void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);
2338 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2339 struct pt_regs *regs)
2342 __rseq_handle_notify_resume(ksig, regs);
2345 static inline void rseq_signal_deliver(struct ksignal *ksig,
2346 struct pt_regs *regs)
2349 __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
2351 rseq_handle_notify_resume(ksig, regs);
2354 /* rseq_preempt() requires preemption to be disabled. */
2355 static inline void rseq_preempt(struct task_struct *t)
2357 __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
2358 rseq_set_notify_resume(t);
2361 /* rseq_migrate() requires preemption to be disabled. */
2362 static inline void rseq_migrate(struct task_struct *t)
2364 __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
2365 rseq_set_notify_resume(t);
2369 * If parent process has a registered restartable sequences area, the
2370 * child inherits. Unregister rseq for a clone with CLONE_VM set.
2372 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2374 if (clone_flags & CLONE_VM) {
2378 t->rseq_event_mask = 0;
2380 t->rseq = current->rseq;
2381 t->rseq_len = current->rseq_len;
2382 t->rseq_sig = current->rseq_sig;
2383 t->rseq_event_mask = current->rseq_event_mask;
2387 static inline void rseq_execve(struct task_struct *t)
2392 t->rseq_event_mask = 0;
2397 static inline void rseq_set_notify_resume(struct task_struct *t)
2400 static inline void rseq_handle_notify_resume(struct ksignal *ksig,
2401 struct pt_regs *regs)
2404 static inline void rseq_signal_deliver(struct ksignal *ksig,
2405 struct pt_regs *regs)
2408 static inline void rseq_preempt(struct task_struct *t)
2411 static inline void rseq_migrate(struct task_struct *t)
2414 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
2417 static inline void rseq_execve(struct task_struct *t)
2423 #ifdef CONFIG_DEBUG_RSEQ
2425 void rseq_syscall(struct pt_regs *regs);
2429 static inline void rseq_syscall(struct pt_regs *regs)
2435 #ifdef CONFIG_SCHED_CORE
2436 extern void sched_core_free(struct task_struct *tsk);
2437 extern void sched_core_fork(struct task_struct *p);
2438 extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type,
2439 unsigned long uaddr);
2441 static inline void sched_core_free(struct task_struct *tsk) { }
2442 static inline void sched_core_fork(struct task_struct *p) { }
2445 extern void sched_set_stop_task(int cpu, struct task_struct *stop);