include/linux/sched.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SCHED_H
   3 #define _LINUX_SCHED_H
   4
   5 /*
   6  * Define 'struct task_struct' and provide the main scheduler
   7  * APIs (schedule(), wakeup variants, etc.)
   8  */
   9
  10 #include <uapi/linux/sched.h>
  11
  12 #include <asm/current.h>
  13 #include <asm/processor.h>
  14 #include <linux/thread_info.h>
  15 #include <linux/preempt.h>
  16 #include <linux/cpumask_types.h>
  17
  18 #include <linux/cache.h>
  19 #include <linux/irqflags_types.h>
  20 #include <linux/smp_types.h>
  21 #include <linux/pid_types.h>
  22 #include <linux/sem_types.h>
  23 #include <linux/shm.h>
  24 #include <linux/kmsan_types.h>
  25 #include <linux/mutex_types.h>
  26 #include <linux/plist_types.h>
  27 #include <linux/hrtimer_types.h>
  28 #include <linux/timer_types.h>
  29 #include <linux/seccomp_types.h>
  30 #include <linux/nodemask_types.h>
  31 #include <linux/refcount_types.h>
  32 #include <linux/resource.h>
  33 #include <linux/latencytop.h>
  34 #include <linux/sched/prio.h>
  35 #include <linux/sched/types.h>
  36 #include <linux/signal_types.h>
  37 #include <linux/syscall_user_dispatch_types.h>
  38 #include <linux/mm_types_task.h>
  39 #include <linux/netdevice_xmit.h>
  40 #include <linux/task_io_accounting.h>
  41 #include <linux/posix-timers_types.h>
  42 #include <linux/restart_block.h>
  43 #include <uapi/linux/rseq.h>
  44 #include <linux/seqlock_types.h>
  45 #include <linux/kcsan.h>
  46 #include <linux/rv.h>
  47 #include <linux/livepatch_sched.h>
  48 #include <linux/uidgid_types.h>
  49 #include <asm/kmap_size.h>
  50
  51 /* task_struct member predeclarations (sorted alphabetically): */
  52 struct audit_context;
  53 struct bio_list;
  54 struct blk_plug;
  55 struct bpf_local_storage;
  56 struct bpf_run_ctx;
  57 struct bpf_net_context;
  58 struct capture_control;
  59 struct cfs_rq;
  60 struct fs_struct;
  61 struct futex_pi_state;
  62 struct io_context;
  63 struct io_uring_task;
  64 struct mempolicy;
  65 struct nameidata;
  66 struct nsproxy;
  67 struct perf_event_context;
  68 struct pid_namespace;
  69 struct pipe_inode_info;
  70 struct rcu_node;
  71 struct reclaim_state;
  72 struct robust_list_head;
  73 struct root_domain;
  74 struct rq;
  75 struct sched_attr;
  76 struct sched_dl_entity;
  77 struct seq_file;
  78 struct sighand_struct;
  79 struct signal_struct;
  80 struct task_delay_info;
  81 struct task_group;
  82 struct task_struct;
  83 struct user_event_mm;
  84
  85 #include <linux/sched/ext.h>
  86
  87 /*
  88  * Task state bitmask. NOTE! These bits are also
  89  * encoded in fs/proc/array.c: get_task_state().
  90  *
  91  * We have two separate sets of flags: task->__state
  92  * is about runnability, while task->exit_state are
  93  * about the task exiting. Confusing, but this way
  94  * modifying one set can't modify the other one by
  95  * mistake.
  96  */
  97
  98 /* Used in tsk->__state: */
  99 #define TASK_RUNNING                    0x00000000
 100 #define TASK_INTERRUPTIBLE              0x00000001
 101 #define TASK_UNINTERRUPTIBLE            0x00000002
 102 #define __TASK_STOPPED                  0x00000004
 103 #define __TASK_TRACED                   0x00000008
 104 /* Used in tsk->exit_state: */
 105 #define EXIT_DEAD                       0x00000010
 106 #define EXIT_ZOMBIE                     0x00000020
 107 #define EXIT_TRACE                      (EXIT_ZOMBIE | EXIT_DEAD)
 108 /* Used in tsk->__state again: */
 109 #define TASK_PARKED                     0x00000040
 110 #define TASK_DEAD                       0x00000080
 111 #define TASK_WAKEKILL                   0x00000100
 112 #define TASK_WAKING                     0x00000200
 113 #define TASK_NOLOAD                     0x00000400
 114 #define TASK_NEW                        0x00000800
 115 #define TASK_RTLOCK_WAIT                0x00001000
 116 #define TASK_FREEZABLE                  0x00002000
 117 #define __TASK_FREEZABLE_UNSAFE        (0x00004000 * IS_ENABLED(CONFIG_LOCKDEP))
 118 #define TASK_FROZEN                     0x00008000
 119 #define TASK_STATE_MAX                  0x00010000
 120
 121 #define TASK_ANY                        (TASK_STATE_MAX-1)
 122
 123 /*
 124  * DO NOT ADD ANY NEW USERS !
 125  */
 126 #define TASK_FREEZABLE_UNSAFE           (TASK_FREEZABLE | __TASK_FREEZABLE_UNSAFE)
 127
 128 /* Convenience macros for the sake of set_current_state: */
 129 #define TASK_KILLABLE                   (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 130 #define TASK_STOPPED                    (TASK_WAKEKILL | __TASK_STOPPED)
 131 #define TASK_TRACED                     __TASK_TRACED
 132
 133 #define TASK_IDLE                       (TASK_UNINTERRUPTIBLE | TASK_NOLOAD)
 134
 135 /* Convenience macros for the sake of wake_up(): */
 136 #define TASK_NORMAL                     (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 137
 138 /* get_task_state(): */
 139 #define TASK_REPORT                     (TASK_RUNNING | TASK_INTERRUPTIBLE | \
 140                                          TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 141                                          __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
 142                                          TASK_PARKED)
 143
 144 #define task_is_running(task)           (READ_ONCE((task)->__state) == TASK_RUNNING)
 145
 146 #define task_is_traced(task)            ((READ_ONCE(task->jobctl) & JOBCTL_TRACED) != 0)
 147 #define task_is_stopped(task)           ((READ_ONCE(task->jobctl) & JOBCTL_STOPPED) != 0)
 148 #define task_is_stopped_or_traced(task) ((READ_ONCE(task->jobctl) & (JOBCTL_STOPPED | JOBCTL_TRACED)) != 0)
 149
 150 /*
 151  * Special states are those that do not use the normal wait-loop pattern. See
 152  * the comment with set_special_state().
 153  */
 154 #define is_special_task_state(state)                                    \
 155         ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED |      \
 156                     TASK_DEAD | TASK_FROZEN))
 157
 158 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
 159 # define debug_normal_state_change(state_value)                         \
 160         do {                                                            \
 161                 WARN_ON_ONCE(is_special_task_state(state_value));       \
 162                 current->task_state_change = _THIS_IP_;                 \
 163         } while (0)
 164
 165 # define debug_special_state_change(state_value)                        \
 166         do {                                                            \
 167                 WARN_ON_ONCE(!is_special_task_state(state_value));      \
 168                 current->task_state_change = _THIS_IP_;                 \
 169         } while (0)
 170
 171 # define debug_rtlock_wait_set_state()                                  \
 172         do {                                                             \
 173                 current->saved_state_change = current->task_state_change;\
 174                 current->task_state_change = _THIS_IP_;                  \
 175         } while (0)
 176
 177 # define debug_rtlock_wait_restore_state()                              \
 178         do {                                                             \
 179                 current->task_state_change = current->saved_state_change;\
 180         } while (0)
 181
 182 #else
 183 # define debug_normal_state_change(cond)        do { } while (0)
 184 # define debug_special_state_change(cond)       do { } while (0)
 185 # define debug_rtlock_wait_set_state()          do { } while (0)
 186 # define debug_rtlock_wait_restore_state()      do { } while (0)
 187 #endif
 188
 189 /*
 190  * set_current_state() includes a barrier so that the write of current->__state
 191  * is correctly serialised wrt the caller's subsequent test of whether to
 192  * actually sleep:
 193  *
 194  *   for (;;) {
 195  *      set_current_state(TASK_UNINTERRUPTIBLE);
 196  *      if (CONDITION)
 197  *         break;
 198  *
 199  *      schedule();
 200  *   }
 201  *   __set_current_state(TASK_RUNNING);
 202  *
 203  * If the caller does not need such serialisation (because, for instance, the
 204  * CONDITION test and condition change and wakeup are under the same lock) then
 205  * use __set_current_state().
 206  *
 207  * The above is typically ordered against the wakeup, which does:
 208  *
 209  *   CONDITION = 1;
 210  *   wake_up_state(p, TASK_UNINTERRUPTIBLE);
 211  *
 212  * where wake_up_state()/try_to_wake_up() executes a full memory barrier before
 213  * accessing p->__state.
 214  *
 215  * Wakeup will do: if (@state & p->__state) p->__state = TASK_RUNNING, that is,
 216  * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
 217  * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
 218  *
 219  * However, with slightly different timing the wakeup TASK_RUNNING store can
 220  * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not
 221  * a problem either because that will result in one extra go around the loop
 222  * and our @cond test will save the day.
 223  *
 224  * Also see the comments of try_to_wake_up().
 225  */
 226 #define __set_current_state(state_value)                                \
 227         do {                                                            \
 228                 debug_normal_state_change((state_value));               \
 229                 WRITE_ONCE(current->__state, (state_value));            \
 230         } while (0)
 231
 232 #define set_current_state(state_value)                                  \
 233         do {                                                            \
 234                 debug_normal_state_change((state_value));               \
 235                 smp_store_mb(current->__state, (state_value));          \
 236         } while (0)
 237
 238 /*
 239  * set_special_state() should be used for those states when the blocking task
 240  * can not use the regular condition based wait-loop. In that case we must
 241  * serialize against wakeups such that any possible in-flight TASK_RUNNING
 242  * stores will not collide with our state change.
 243  */
 244 #define set_special_state(state_value)                                  \
 245         do {                                                            \
 246                 unsigned long flags; /* may shadow */                   \
 247                                                                         \
 248                 raw_spin_lock_irqsave(&current->pi_lock, flags);        \
 249                 debug_special_state_change((state_value));              \
 250                 WRITE_ONCE(current->__state, (state_value));            \
 251                 raw_spin_unlock_irqrestore(&current->pi_lock, flags);   \
 252         } while (0)
 253
 254 /*
 255  * PREEMPT_RT specific variants for "sleeping" spin/rwlocks
 256  *
 257  * RT's spin/rwlock substitutions are state preserving. The state of the
 258  * task when blocking on the lock is saved in task_struct::saved_state and
 259  * restored after the lock has been acquired.  These operations are
 260  * serialized by task_struct::pi_lock against try_to_wake_up(). Any non RT
 261  * lock related wakeups while the task is blocked on the lock are
 262  * redirected to operate on task_struct::saved_state to ensure that these
 263  * are not dropped. On restore task_struct::saved_state is set to
 264  * TASK_RUNNING so any wakeup attempt redirected to saved_state will fail.
 265  *
 266  * The lock operation looks like this:
 267  *
 268  *      current_save_and_set_rtlock_wait_state();
 269  *      for (;;) {
 270  *              if (try_lock())
 271  *                      break;
 272  *              raw_spin_unlock_irq(&lock->wait_lock);
 273  *              schedule_rtlock();
 274  *              raw_spin_lock_irq(&lock->wait_lock);
 275  *              set_current_state(TASK_RTLOCK_WAIT);
 276  *      }
 277  *      current_restore_rtlock_saved_state();
 278  */
 279 #define current_save_and_set_rtlock_wait_state()                        \
 280         do {                                                            \
 281                 lockdep_assert_irqs_disabled();                         \
 282                 raw_spin_lock(&current->pi_lock);                       \
 283                 current->saved_state = current->__state;                \
 284                 debug_rtlock_wait_set_state();                          \
 285                 WRITE_ONCE(current->__state, TASK_RTLOCK_WAIT);         \
 286                 raw_spin_unlock(&current->pi_lock);                     \
 287         } while (0);
 288
 289 #define current_restore_rtlock_saved_state()                            \
 290         do {                                                            \
 291                 lockdep_assert_irqs_disabled();                         \
 292                 raw_spin_lock(&current->pi_lock);                       \
 293                 debug_rtlock_wait_restore_state();                      \
 294                 WRITE_ONCE(current->__state, current->saved_state);     \
 295                 current->saved_state = TASK_RUNNING;                    \
 296                 raw_spin_unlock(&current->pi_lock);                     \
 297         } while (0);
 298
 299 #define get_current_state()     READ_ONCE(current->__state)
 300
 301 /*
 302  * Define the task command name length as enum, then it can be visible to
 303  * BPF programs.
 304  */
 305 enum {
 306         TASK_COMM_LEN = 16,
 307 };
 308
 309 extern void sched_tick(void);
 310
 311 #define MAX_SCHEDULE_TIMEOUT            LONG_MAX
 312
 313 extern long schedule_timeout(long timeout);
 314 extern long schedule_timeout_interruptible(long timeout);
 315 extern long schedule_timeout_killable(long timeout);
 316 extern long schedule_timeout_uninterruptible(long timeout);
 317 extern long schedule_timeout_idle(long timeout);
 318 asmlinkage void schedule(void);
 319 extern void schedule_preempt_disabled(void);
 320 asmlinkage void preempt_schedule_irq(void);
 321 #ifdef CONFIG_PREEMPT_RT
 322  extern void schedule_rtlock(void);
 323 #endif
 324
 325 extern int __must_check io_schedule_prepare(void);
 326 extern void io_schedule_finish(int token);
 327 extern long io_schedule_timeout(long timeout);
 328 extern void io_schedule(void);
 329
 330 /**
 331  * struct prev_cputime - snapshot of system and user cputime
 332  * @utime: time spent in user mode
 333  * @stime: time spent in system mode
 334  * @lock: protects the above two fields
 335  *
 336  * Stores previous user/system time values such that we can guarantee
 337  * monotonicity.
 338  */
 339 struct prev_cputime {
 340 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 341         u64                             utime;
 342         u64                             stime;
 343         raw_spinlock_t                  lock;
 344 #endif
 345 };
 346
 347 enum vtime_state {
 348         /* Task is sleeping or running in a CPU with VTIME inactive: */
 349         VTIME_INACTIVE = 0,
 350         /* Task is idle */
 351         VTIME_IDLE,
 352         /* Task runs in kernelspace in a CPU with VTIME active: */
 353         VTIME_SYS,
 354         /* Task runs in userspace in a CPU with VTIME active: */
 355         VTIME_USER,
 356         /* Task runs as guests in a CPU with VTIME active: */
 357         VTIME_GUEST,
 358 };
 359
 360 struct vtime {
 361         seqcount_t              seqcount;
 362         unsigned long long      starttime;
 363         enum vtime_state        state;
 364         unsigned int            cpu;
 365         u64                     utime;
 366         u64                     stime;
 367         u64                     gtime;
 368 };
 369
 370 /*
 371  * Utilization clamp constraints.
 372  * @UCLAMP_MIN: Minimum utilization
 373  * @UCLAMP_MAX: Maximum utilization
 374  * @UCLAMP_CNT: Utilization clamp constraints count
 375  */
 376 enum uclamp_id {
 377         UCLAMP_MIN = 0,
 378         UCLAMP_MAX,
 379         UCLAMP_CNT
 380 };
 381
 382 #ifdef CONFIG_SMP
 383 extern struct root_domain def_root_domain;
 384 extern struct mutex sched_domains_mutex;
 385 #endif
 386
 387 struct sched_param {
 388         int sched_priority;
 389 };
 390
 391 struct sched_info {
 392 #ifdef CONFIG_SCHED_INFO
 393         /* Cumulative counters: */
 394
 395         /* # of times we have run on this CPU: */
 396         unsigned long                   pcount;
 397
 398         /* Time spent waiting on a runqueue: */
 399         unsigned long long              run_delay;
 400
 401         /* Max time spent waiting on a runqueue: */
 402         unsigned long long              max_run_delay;
 403
 404         /* Min time spent waiting on a runqueue: */
 405         unsigned long long              min_run_delay;
 406
 407         /* Timestamps: */
 408
 409         /* When did we last run on a CPU? */
 410         unsigned long long              last_arrival;
 411
 412         /* When were we last queued to run? */
 413         unsigned long long              last_queued;
 414
 415 #endif /* CONFIG_SCHED_INFO */
 416 };
 417
 418 /*
 419  * Integer metrics need fixed point arithmetic, e.g., sched/fair
 420  * has a few: load, load_avg, util_avg, freq, and capacity.
 421  *
 422  * We define a basic fixed point arithmetic range, and then formalize
 423  * all these metrics based on that basic range.
 424  */
 425 # define SCHED_FIXEDPOINT_SHIFT         10
 426 # define SCHED_FIXEDPOINT_SCALE         (1L << SCHED_FIXEDPOINT_SHIFT)
 427
 428 /* Increase resolution of cpu_capacity calculations */
 429 # define SCHED_CAPACITY_SHIFT           SCHED_FIXEDPOINT_SHIFT
 430 # define SCHED_CAPACITY_SCALE           (1L << SCHED_CAPACITY_SHIFT)
 431
 432 struct load_weight {
 433         unsigned long                   weight;
 434         u32                             inv_weight;
 435 };
 436
 437 /*
 438  * The load/runnable/util_avg accumulates an infinite geometric series
 439  * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c).
 440  *
 441  * [load_avg definition]
 442  *
 443  *   load_avg = runnable% * scale_load_down(load)
 444  *
 445  * [runnable_avg definition]
 446  *
 447  *   runnable_avg = runnable% * SCHED_CAPACITY_SCALE
 448  *
 449  * [util_avg definition]
 450  *
 451  *   util_avg = running% * SCHED_CAPACITY_SCALE
 452  *
 453  * where runnable% is the time ratio that a sched_entity is runnable and
 454  * running% the time ratio that a sched_entity is running.
 455  *
 456  * For cfs_rq, they are the aggregated values of all runnable and blocked
 457  * sched_entities.
 458  *
 459  * The load/runnable/util_avg doesn't directly factor frequency scaling and CPU
 460  * capacity scaling. The scaling is done through the rq_clock_pelt that is used
 461  * for computing those signals (see update_rq_clock_pelt())
 462  *
 463  * N.B., the above ratios (runnable% and running%) themselves are in the
 464  * range of [0, 1]. To do fixed point arithmetics, we therefore scale them
 465  * to as large a range as necessary. This is for example reflected by
 466  * util_avg's SCHED_CAPACITY_SCALE.
 467  *
 468  * [Overflow issue]
 469  *
 470  * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
 471  * with the highest load (=88761), always runnable on a single cfs_rq,
 472  * and should not overflow as the number already hits PID_MAX_LIMIT.
 473  *
 474  * For all other cases (including 32-bit kernels), struct load_weight's
 475  * weight will overflow first before we do, because:
 476  *
 477  *    Max(load_avg) <= Max(load.weight)
 478  *
 479  * Then it is the load_weight's responsibility to consider overflow
 480  * issues.
 481  */
 482 struct sched_avg {
 483         u64                             last_update_time;
 484         u64                             load_sum;
 485         u64                             runnable_sum;
 486         u32                             util_sum;
 487         u32                             period_contrib;
 488         unsigned long                   load_avg;
 489         unsigned long                   runnable_avg;
 490         unsigned long                   util_avg;
 491         unsigned int                    util_est;
 492 } ____cacheline_aligned;
 493
 494 /*
 495  * The UTIL_AVG_UNCHANGED flag is used to synchronize util_est with util_avg
 496  * updates. When a task is dequeued, its util_est should not be updated if its
 497  * util_avg has not been updated in the meantime.
 498  * This information is mapped into the MSB bit of util_est at dequeue time.
 499  * Since max value of util_est for a task is 1024 (PELT util_avg for a task)
 500  * it is safe to use MSB.
 501  */
 502 #define UTIL_EST_WEIGHT_SHIFT           2
 503 #define UTIL_AVG_UNCHANGED              0x80000000
 504
 505 struct sched_statistics {
 506 #ifdef CONFIG_SCHEDSTATS
 507         u64                             wait_start;
 508         u64                             wait_max;
 509         u64                             wait_count;
 510         u64                             wait_sum;
 511         u64                             iowait_count;
 512         u64                             iowait_sum;
 513
 514         u64                             sleep_start;
 515         u64                             sleep_max;
 516         s64                             sum_sleep_runtime;
 517
 518         u64                             block_start;
 519         u64                             block_max;
 520         s64                             sum_block_runtime;
 521
 522         s64                             exec_max;
 523         u64                             slice_max;
 524
 525         u64                             nr_migrations_cold;
 526         u64                             nr_failed_migrations_affine;
 527         u64                             nr_failed_migrations_running;
 528         u64                             nr_failed_migrations_hot;
 529         u64                             nr_forced_migrations;
 530
 531         u64                             nr_wakeups;
 532         u64                             nr_wakeups_sync;
 533         u64                             nr_wakeups_migrate;
 534         u64                             nr_wakeups_local;
 535         u64                             nr_wakeups_remote;
 536         u64                             nr_wakeups_affine;
 537         u64                             nr_wakeups_affine_attempts;
 538         u64                             nr_wakeups_passive;
 539         u64                             nr_wakeups_idle;
 540
 541 #ifdef CONFIG_SCHED_CORE
 542         u64                             core_forceidle_sum;
 543 #endif
 544 #endif /* CONFIG_SCHEDSTATS */
 545 } ____cacheline_aligned;
 546
 547 struct sched_entity {
 548         /* For load-balancing: */
 549         struct load_weight              load;
 550         struct rb_node                  run_node;
 551         u64                             deadline;
 552         u64                             min_vruntime;
 553         u64                             min_slice;
 554
 555         struct list_head                group_node;
 556         unsigned char                   on_rq;
 557         unsigned char                   sched_delayed;
 558         unsigned char                   rel_deadline;
 559         unsigned char                   custom_slice;
 560                                         /* hole */
 561
 562         u64                             exec_start;
 563         u64                             sum_exec_runtime;
 564         u64                             prev_sum_exec_runtime;
 565         u64                             vruntime;
 566         s64                             vlag;
 567         u64                             slice;
 568
 569         u64                             nr_migrations;
 570
 571 #ifdef CONFIG_FAIR_GROUP_SCHED
 572         int                             depth;
 573         struct sched_entity             *parent;
 574         /* rq on which this entity is (to be) queued: */
 575         struct cfs_rq                   *cfs_rq;
 576         /* rq "owned" by this entity/group: */
 577         struct cfs_rq                   *my_q;
 578         /* cached value of my_q->h_nr_running */
 579         unsigned long                   runnable_weight;
 580 #endif
 581
 582 #ifdef CONFIG_SMP
 583         /*
 584          * Per entity load average tracking.
 585          *
 586          * Put into separate cache line so it does not
 587          * collide with read-mostly values above.
 588          */
 589         struct sched_avg                avg;
 590 #endif
 591 };
 592
 593 struct sched_rt_entity {
 594         struct list_head                run_list;
 595         unsigned long                   timeout;
 596         unsigned long                   watchdog_stamp;
 597         unsigned int                    time_slice;
 598         unsigned short                  on_rq;
 599         unsigned short                  on_list;
 600
 601         struct sched_rt_entity          *back;
 602 #ifdef CONFIG_RT_GROUP_SCHED
 603         struct sched_rt_entity          *parent;
 604         /* rq on which this entity is (to be) queued: */
 605         struct rt_rq                    *rt_rq;
 606         /* rq "owned" by this entity/group: */
 607         struct rt_rq                    *my_q;
 608 #endif
 609 } __randomize_layout;
 610
 611 typedef bool (*dl_server_has_tasks_f)(struct sched_dl_entity *);
 612 typedef struct task_struct *(*dl_server_pick_f)(struct sched_dl_entity *);
 613
 614 struct sched_dl_entity {
 615         struct rb_node                  rb_node;
 616
 617         /*
 618          * Original scheduling parameters. Copied here from sched_attr
 619          * during sched_setattr(), they will remain the same until
 620          * the next sched_setattr().
 621          */
 622         u64                             dl_runtime;     /* Maximum runtime for each instance    */
 623         u64                             dl_deadline;    /* Relative deadline of each instance   */
 624         u64                             dl_period;      /* Separation of two instances (period) */
 625         u64                             dl_bw;          /* dl_runtime / dl_period               */
 626         u64                             dl_density;     /* dl_runtime / dl_deadline             */
 627
 628         /*
 629          * Actual scheduling parameters. Initialized with the values above,
 630          * they are continuously updated during task execution. Note that
 631          * the remaining runtime could be < 0 in case we are in overrun.
 632          */
 633         s64                             runtime;        /* Remaining runtime for this instance  */
 634         u64                             deadline;       /* Absolute deadline for this instance  */
 635         unsigned int                    flags;          /* Specifying the scheduler behaviour   */
 636
 637         /*
 638          * Some bool flags:
 639          *
 640          * @dl_throttled tells if we exhausted the runtime. If so, the
 641          * task has to wait for a replenishment to be performed at the
 642          * next firing of dl_timer.
 643          *
 644          * @dl_yielded tells if task gave up the CPU before consuming
 645          * all its available runtime during the last job.
 646          *
 647          * @dl_non_contending tells if the task is inactive while still
 648          * contributing to the active utilization. In other words, it
 649          * indicates if the inactive timer has been armed and its handler
 650          * has not been executed yet. This flag is useful to avoid race
 651          * conditions between the inactive timer handler and the wakeup
 652          * code.
 653          *
 654          * @dl_overrun tells if the task asked to be informed about runtime
 655          * overruns.
 656          *
 657          * @dl_server tells if this is a server entity.
 658          *
 659          * @dl_defer tells if this is a deferred or regular server. For
 660          * now only defer server exists.
 661          *
 662          * @dl_defer_armed tells if the deferrable server is waiting
 663          * for the replenishment timer to activate it.
 664          *
 665          * @dl_server_active tells if the dlserver is active(started).
 666          * dlserver is started on first cfs enqueue on an idle runqueue
 667          * and is stopped when a dequeue results in 0 cfs tasks on the
 668          * runqueue. In other words, dlserver is active only when cpu's
 669          * runqueue has atleast one cfs task.
 670          *
 671          * @dl_defer_running tells if the deferrable server is actually
 672          * running, skipping the defer phase.
 673          */
 674         unsigned int                    dl_throttled      : 1;
 675         unsigned int                    dl_yielded        : 1;
 676         unsigned int                    dl_non_contending : 1;
 677         unsigned int                    dl_overrun        : 1;
 678         unsigned int                    dl_server         : 1;
 679         unsigned int                    dl_server_active  : 1;
 680         unsigned int                    dl_defer          : 1;
 681         unsigned int                    dl_defer_armed    : 1;
 682         unsigned int                    dl_defer_running  : 1;
 683
 684         /*
 685          * Bandwidth enforcement timer. Each -deadline task has its
 686          * own bandwidth to be enforced, thus we need one timer per task.
 687          */
 688         struct hrtimer                  dl_timer;
 689
 690         /*
 691          * Inactive timer, responsible for decreasing the active utilization
 692          * at the "0-lag time". When a -deadline task blocks, it contributes
 693          * to GRUB's active utilization until the "0-lag time", hence a
 694          * timer is needed to decrease the active utilization at the correct
 695          * time.
 696          */
 697         struct hrtimer                  inactive_timer;
 698
 699         /*
 700          * Bits for DL-server functionality. Also see the comment near
 701          * dl_server_update().
 702          *
 703          * @rq the runqueue this server is for
 704          *
 705          * @server_has_tasks() returns true if @server_pick return a
 706          * runnable task.
 707          */
 708         struct rq                       *rq;
 709         dl_server_has_tasks_f           server_has_tasks;
 710         dl_server_pick_f                server_pick_task;
 711
 712 #ifdef CONFIG_RT_MUTEXES
 713         /*
 714          * Priority Inheritance. When a DEADLINE scheduling entity is boosted
 715          * pi_se points to the donor, otherwise points to the dl_se it belongs
 716          * to (the original one/itself).
 717          */
 718         struct sched_dl_entity *pi_se;
 719 #endif
 720 };
 721
 722 #ifdef CONFIG_UCLAMP_TASK
 723 /* Number of utilization clamp buckets (shorter alias) */
 724 #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT
 725
 726 /*
 727  * Utilization clamp for a scheduling entity
 728  * @value:              clamp value "assigned" to a se
 729  * @bucket_id:          bucket index corresponding to the "assigned" value
 730  * @active:             the se is currently refcounted in a rq's bucket
 731  * @user_defined:       the requested clamp value comes from user-space
 732  *
 733  * The bucket_id is the index of the clamp bucket matching the clamp value
 734  * which is pre-computed and stored to avoid expensive integer divisions from
 735  * the fast path.
 736  *
 737  * The active bit is set whenever a task has got an "effective" value assigned,
 738  * which can be different from the clamp value "requested" from user-space.
 739  * This allows to know a task is refcounted in the rq's bucket corresponding
 740  * to the "effective" bucket_id.
 741  *
 742  * The user_defined bit is set whenever a task has got a task-specific clamp
 743  * value requested from userspace, i.e. the system defaults apply to this task
 744  * just as a restriction. This allows to relax default clamps when a less
 745  * restrictive task-specific value has been requested, thus allowing to
 746  * implement a "nice" semantic. For example, a task running with a 20%
 747  * default boost can still drop its own boosting to 0%.
 748  */
 749 struct uclamp_se {
 750         unsigned int value              : bits_per(SCHED_CAPACITY_SCALE);
 751         unsigned int bucket_id          : bits_per(UCLAMP_BUCKETS);
 752         unsigned int active             : 1;
 753         unsigned int user_defined       : 1;
 754 };
 755 #endif /* CONFIG_UCLAMP_TASK */
 756
 757 union rcu_special {
 758         struct {
 759                 u8                      blocked;
 760                 u8                      need_qs;
 761                 u8                      exp_hint; /* Hint for performance. */
 762                 u8                      need_mb; /* Readers need smp_mb(). */
 763         } b; /* Bits. */
 764         u32 s; /* Set of bits. */
 765 };
 766
 767 enum perf_event_task_context {
 768         perf_invalid_context = -1,
 769         perf_hw_context = 0,
 770         perf_sw_context,
 771         perf_nr_task_contexts,
 772 };
 773
 774 /*
 775  * Number of contexts where an event can trigger:
 776  *      task, softirq, hardirq, nmi.
 777  */
 778 #define PERF_NR_CONTEXTS        4
 779
 780 struct wake_q_node {
 781         struct wake_q_node *next;
 782 };
 783
 784 struct kmap_ctrl {
 785 #ifdef CONFIG_KMAP_LOCAL
 786         int                             idx;
 787         pte_t                           pteval[KM_MAX_IDX];
 788 #endif
 789 };
 790
 791 struct task_struct {
 792 #ifdef CONFIG_THREAD_INFO_IN_TASK
 793         /*
 794          * For reasons of header soup (see current_thread_info()), this
 795          * must be the first element of task_struct.
 796          */
 797         struct thread_info              thread_info;
 798 #endif
 799         unsigned int                    __state;
 800
 801         /* saved state for "spinlock sleepers" */
 802         unsigned int                    saved_state;
 803
 804         /*
 805          * This begins the randomizable portion of task_struct. Only
 806          * scheduling-critical items should be added above here.
 807          */
 808         randomized_struct_fields_start
 809
 810         void                            *stack;
 811         refcount_t                      usage;
 812         /* Per task flags (PF_*), defined further below: */
 813         unsigned int                    flags;
 814         unsigned int                    ptrace;
 815
 816 #ifdef CONFIG_MEM_ALLOC_PROFILING
 817         struct alloc_tag                *alloc_tag;
 818 #endif
 819
 820 #ifdef CONFIG_SMP
 821         int                             on_cpu;
 822         struct __call_single_node       wake_entry;
 823         unsigned int                    wakee_flips;
 824         unsigned long                   wakee_flip_decay_ts;
 825         struct task_struct              *last_wakee;
 826
 827         /*
 828          * recent_used_cpu is initially set as the last CPU used by a task
 829          * that wakes affine another task. Waker/wakee relationships can
 830          * push tasks around a CPU where each wakeup moves to the next one.
 831          * Tracking a recently used CPU allows a quick search for a recently
 832          * used CPU that may be idle.
 833          */
 834         int                             recent_used_cpu;
 835         int                             wake_cpu;
 836 #endif
 837         int                             on_rq;
 838
 839         int                             prio;
 840         int                             static_prio;
 841         int                             normal_prio;
 842         unsigned int                    rt_priority;
 843
 844         struct sched_entity             se;
 845         struct sched_rt_entity          rt;
 846         struct sched_dl_entity          dl;
 847         struct sched_dl_entity          *dl_server;
 848 #ifdef CONFIG_SCHED_CLASS_EXT
 849         struct sched_ext_entity         scx;
 850 #endif
 851         const struct sched_class        *sched_class;
 852
 853 #ifdef CONFIG_SCHED_CORE
 854         struct rb_node                  core_node;
 855         unsigned long                   core_cookie;
 856         unsigned int                    core_occupation;
 857 #endif
 858
 859 #ifdef CONFIG_CGROUP_SCHED
 860         struct task_group               *sched_task_group;
 861 #endif
 862
 863
 864 #ifdef CONFIG_UCLAMP_TASK
 865         /*
 866          * Clamp values requested for a scheduling entity.
 867          * Must be updated with task_rq_lock() held.
 868          */
 869         struct uclamp_se                uclamp_req[UCLAMP_CNT];
 870         /*
 871          * Effective clamp values used for a scheduling entity.
 872          * Must be updated with task_rq_lock() held.
 873          */
 874         struct uclamp_se                uclamp[UCLAMP_CNT];
 875 #endif
 876
 877         struct sched_statistics         stats;
 878
 879 #ifdef CONFIG_PREEMPT_NOTIFIERS
 880         /* List of struct preempt_notifier: */
 881         struct hlist_head               preempt_notifiers;
 882 #endif
 883
 884 #ifdef CONFIG_BLK_DEV_IO_TRACE
 885         unsigned int                    btrace_seq;
 886 #endif
 887
 888         unsigned int                    policy;
 889         unsigned long                   max_allowed_capacity;
 890         int                             nr_cpus_allowed;
 891         const cpumask_t                 *cpus_ptr;
 892         cpumask_t                       *user_cpus_ptr;
 893         cpumask_t                       cpus_mask;
 894         void                            *migration_pending;
 895 #ifdef CONFIG_SMP
 896         unsigned short                  migration_disabled;
 897 #endif
 898         unsigned short                  migration_flags;
 899
 900 #ifdef CONFIG_PREEMPT_RCU
 901         int                             rcu_read_lock_nesting;
 902         union rcu_special               rcu_read_unlock_special;
 903         struct list_head                rcu_node_entry;
 904         struct rcu_node                 *rcu_blocked_node;
 905 #endif /* #ifdef CONFIG_PREEMPT_RCU */
 906
 907 #ifdef CONFIG_TASKS_RCU
 908         unsigned long                   rcu_tasks_nvcsw;
 909         u8                              rcu_tasks_holdout;
 910         u8                              rcu_tasks_idx;
 911         int                             rcu_tasks_idle_cpu;
 912         struct list_head                rcu_tasks_holdout_list;
 913         int                             rcu_tasks_exit_cpu;
 914         struct list_head                rcu_tasks_exit_list;
 915 #endif /* #ifdef CONFIG_TASKS_RCU */
 916
 917 #ifdef CONFIG_TASKS_TRACE_RCU
 918         int                             trc_reader_nesting;
 919         int                             trc_ipi_to_cpu;
 920         union rcu_special               trc_reader_special;
 921         struct list_head                trc_holdout_list;
 922         struct list_head                trc_blkd_node;
 923         int                             trc_blkd_cpu;
 924 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 925
 926         struct sched_info               sched_info;
 927
 928         struct list_head                tasks;
 929 #ifdef CONFIG_SMP
 930         struct plist_node               pushable_tasks;
 931         struct rb_node                  pushable_dl_tasks;
 932 #endif
 933
 934         struct mm_struct                *mm;
 935         struct mm_struct                *active_mm;
 936         struct address_space            *faults_disabled_mapping;
 937
 938         int                             exit_state;
 939         int                             exit_code;
 940         int                             exit_signal;
 941         /* The signal sent when the parent dies: */
 942         int                             pdeath_signal;
 943         /* JOBCTL_*, siglock protected: */
 944         unsigned long                   jobctl;
 945
 946         /* Used for emulating ABI behavior of previous Linux versions: */
 947         unsigned int                    personality;
 948
 949         /* Scheduler bits, serialized by scheduler locks: */
 950         unsigned                        sched_reset_on_fork:1;
 951         unsigned                        sched_contributes_to_load:1;
 952         unsigned                        sched_migrated:1;
 953         unsigned                        sched_task_hot:1;
 954
 955         /* Force alignment to the next boundary: */
 956         unsigned                        :0;
 957
 958         /* Unserialized, strictly 'current' */
 959
 960         /*
 961          * This field must not be in the scheduler word above due to wakelist
 962          * queueing no longer being serialized by p->on_cpu. However:
 963          *
 964          * p->XXX = X;                  ttwu()
 965          * schedule()                     if (p->on_rq && ..) // false
 966          *   smp_mb__after_spinlock();    if (smp_load_acquire(&p->on_cpu) && //true
 967          *   deactivate_task()                ttwu_queue_wakelist())
 968          *     p->on_rq = 0;                    p->sched_remote_wakeup = Y;
 969          *
 970          * guarantees all stores of 'current' are visible before
 971          * ->sched_remote_wakeup gets used, so it can be in this word.
 972          */
 973         unsigned                        sched_remote_wakeup:1;
 974 #ifdef CONFIG_RT_MUTEXES
 975         unsigned                        sched_rt_mutex:1;
 976 #endif
 977
 978         /* Bit to tell TOMOYO we're in execve(): */
 979         unsigned                        in_execve:1;
 980         unsigned                        in_iowait:1;
 981 #ifndef TIF_RESTORE_SIGMASK
 982         unsigned                        restore_sigmask:1;
 983 #endif
 984 #ifdef CONFIG_MEMCG_V1
 985         unsigned                        in_user_fault:1;
 986 #endif
 987 #ifdef CONFIG_LRU_GEN
 988         /* whether the LRU algorithm may apply to this access */
 989         unsigned                        in_lru_fault:1;
 990 #endif
 991 #ifdef CONFIG_COMPAT_BRK
 992         unsigned                        brk_randomized:1;
 993 #endif
 994 #ifdef CONFIG_CGROUPS
 995         /* disallow userland-initiated cgroup migration */
 996         unsigned                        no_cgroup_migration:1;
 997         /* task is frozen/stopped (used by the cgroup freezer) */
 998         unsigned                        frozen:1;
 999 #endif
1000 #ifdef CONFIG_BLK_CGROUP
1001         unsigned                        use_memdelay:1;
1002 #endif
1003 #ifdef CONFIG_PSI
1004         /* Stalled due to lack of memory */
1005         unsigned                        in_memstall:1;
1006 #endif
1007 #ifdef CONFIG_PAGE_OWNER
1008         /* Used by page_owner=on to detect recursion in page tracking. */
1009         unsigned                        in_page_owner:1;
1010 #endif
1011 #ifdef CONFIG_EVENTFD
1012         /* Recursion prevention for eventfd_signal() */
1013         unsigned                        in_eventfd:1;
1014 #endif
1015 #ifdef CONFIG_ARCH_HAS_CPU_PASID
1016         unsigned                        pasid_activated:1;
1017 #endif
1018 #ifdef CONFIG_X86_BUS_LOCK_DETECT
1019         unsigned                        reported_split_lock:1;
1020 #endif
1021 #ifdef CONFIG_TASK_DELAY_ACCT
1022         /* delay due to memory thrashing */
1023         unsigned                        in_thrashing:1;
1024 #endif
1025 #ifdef CONFIG_PREEMPT_RT
1026         struct netdev_xmit              net_xmit;
1027 #endif
1028         unsigned long                   atomic_flags; /* Flags requiring atomic access. */
1029
1030         struct restart_block            restart_block;
1031
1032         pid_t                           pid;
1033         pid_t                           tgid;
1034
1035 #ifdef CONFIG_STACKPROTECTOR
1036         /* Canary value for the -fstack-protector GCC feature: */
1037         unsigned long                   stack_canary;
1038 #endif
1039         /*
1040          * Pointers to the (original) parent process, youngest child, younger sibling,
1041          * older sibling, respectively.  (p->father can be replaced with
1042          * p->real_parent->pid)
1043          */
1044
1045         /* Real parent process: */
1046         struct task_struct __rcu        *real_parent;
1047
1048         /* Recipient of SIGCHLD, wait4() reports: */
1049         struct task_struct __rcu        *parent;
1050
1051         /*
1052          * Children/sibling form the list of natural children:
1053          */
1054         struct list_head                children;
1055         struct list_head                sibling;
1056         struct task_struct              *group_leader;
1057
1058         /*
1059          * 'ptraced' is the list of tasks this task is using ptrace() on.
1060          *
1061          * This includes both natural children and PTRACE_ATTACH targets.
1062          * 'ptrace_entry' is this task's link on the p->parent->ptraced list.
1063          */
1064         struct list_head                ptraced;
1065         struct list_head                ptrace_entry;
1066
1067         /* PID/PID hash table linkage. */
1068         struct pid                      *thread_pid;
1069         struct hlist_node               pid_links[PIDTYPE_MAX];
1070         struct list_head                thread_node;
1071
1072         struct completion               *vfork_done;
1073
1074         /* CLONE_CHILD_SETTID: */
1075         int __user                      *set_child_tid;
1076
1077         /* CLONE_CHILD_CLEARTID: */
1078         int __user                      *clear_child_tid;
1079
1080         /* PF_KTHREAD | PF_IO_WORKER */
1081         void                            *worker_private;
1082
1083         u64                             utime;
1084         u64                             stime;
1085 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
1086         u64                             utimescaled;
1087         u64                             stimescaled;
1088 #endif
1089         u64                             gtime;
1090         struct prev_cputime             prev_cputime;
1091 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1092         struct vtime                    vtime;
1093 #endif
1094
1095 #ifdef CONFIG_NO_HZ_FULL
1096         atomic_t                        tick_dep_mask;
1097 #endif
1098         /* Context switch counts: */
1099         unsigned long                   nvcsw;
1100         unsigned long                   nivcsw;
1101
1102         /* Monotonic time in nsecs: */
1103         u64                             start_time;
1104
1105         /* Boot based time in nsecs: */
1106         u64                             start_boottime;
1107
1108         /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */
1109         unsigned long                   min_flt;
1110         unsigned long                   maj_flt;
1111
1112         /* Empty if CONFIG_POSIX_CPUTIMERS=n */
1113         struct posix_cputimers          posix_cputimers;
1114
1115 #ifdef CONFIG_POSIX_CPU_TIMERS_TASK_WORK
1116         struct posix_cputimers_work     posix_cputimers_work;
1117 #endif
1118
1119         /* Process credentials: */
1120
1121         /* Tracer's credentials at attach: */
1122         const struct cred __rcu         *ptracer_cred;
1123
1124         /* Objective and real subjective task credentials (COW): */
1125         const struct cred __rcu         *real_cred;
1126
1127         /* Effective (overridable) subjective task credentials (COW): */
1128         const struct cred __rcu         *cred;
1129
1130 #ifdef CONFIG_KEYS
1131         /* Cached requested key. */
1132         struct key                      *cached_requested_key;
1133 #endif
1134
1135         /*
1136          * executable name, excluding path.
1137          *
1138          * - normally initialized begin_new_exec()
1139          * - set it with set_task_comm()
1140          *   - strscpy_pad() to ensure it is always NUL-terminated and
1141          *     zero-padded
1142          *   - task_lock() to ensure the operation is atomic and the name is
1143          *     fully updated.
1144          */
1145         char                            comm[TASK_COMM_LEN];
1146
1147         struct nameidata                *nameidata;
1148
1149 #ifdef CONFIG_SYSVIPC
1150         struct sysv_sem                 sysvsem;
1151         struct sysv_shm                 sysvshm;
1152 #endif
1153 #ifdef CONFIG_DETECT_HUNG_TASK
1154         unsigned long                   last_switch_count;
1155         unsigned long                   last_switch_time;
1156 #endif
1157         /* Filesystem information: */
1158         struct fs_struct                *fs;
1159
1160         /* Open file information: */
1161         struct files_struct             *files;
1162
1163 #ifdef CONFIG_IO_URING
1164         struct io_uring_task            *io_uring;
1165 #endif
1166
1167         /* Namespaces: */
1168         struct nsproxy                  *nsproxy;
1169
1170         /* Signal handlers: */
1171         struct signal_struct            *signal;
1172         struct sighand_struct __rcu             *sighand;
1173         sigset_t                        blocked;
1174         sigset_t                        real_blocked;
1175         /* Restored if set_restore_sigmask() was used: */
1176         sigset_t                        saved_sigmask;
1177         struct sigpending               pending;
1178         unsigned long                   sas_ss_sp;
1179         size_t                          sas_ss_size;
1180         unsigned int                    sas_ss_flags;
1181
1182         struct callback_head            *task_works;
1183
1184 #ifdef CONFIG_AUDIT
1185 #ifdef CONFIG_AUDITSYSCALL
1186         struct audit_context            *audit_context;
1187 #endif
1188         kuid_t                          loginuid;
1189         unsigned int                    sessionid;
1190 #endif
1191         struct seccomp                  seccomp;
1192         struct syscall_user_dispatch    syscall_dispatch;
1193
1194         /* Thread group tracking: */
1195         u64                             parent_exec_id;
1196         u64                             self_exec_id;
1197
1198         /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
1199         spinlock_t                      alloc_lock;
1200
1201         /* Protection of the PI data structures: */
1202         raw_spinlock_t                  pi_lock;
1203
1204         struct wake_q_node              wake_q;
1205
1206 #ifdef CONFIG_RT_MUTEXES
1207         /* PI waiters blocked on a rt_mutex held by this task: */
1208         struct rb_root_cached           pi_waiters;
1209         /* Updated under owner's pi_lock and rq lock */
1210         struct task_struct              *pi_top_task;
1211         /* Deadlock detection and priority inheritance handling: */
1212         struct rt_mutex_waiter          *pi_blocked_on;
1213 #endif
1214
1215 #ifdef CONFIG_DEBUG_MUTEXES
1216         /* Mutex deadlock detection: */
1217         struct mutex_waiter             *blocked_on;
1218 #endif
1219
1220 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1221         int                             non_block_count;
1222 #endif
1223
1224 #ifdef CONFIG_TRACE_IRQFLAGS
1225         struct irqtrace_events          irqtrace;
1226         unsigned int                    hardirq_threaded;
1227         u64                             hardirq_chain_key;
1228         int                             softirqs_enabled;
1229         int                             softirq_context;
1230         int                             irq_config;
1231 #endif
1232 #ifdef CONFIG_PREEMPT_RT
1233         int                             softirq_disable_cnt;
1234 #endif
1235
1236 #ifdef CONFIG_LOCKDEP
1237 # define MAX_LOCK_DEPTH                 48UL
1238         u64                             curr_chain_key;
1239         int                             lockdep_depth;
1240         unsigned int                    lockdep_recursion;
1241         struct held_lock                held_locks[MAX_LOCK_DEPTH];
1242 #endif
1243
1244 #if defined(CONFIG_UBSAN) && !defined(CONFIG_UBSAN_TRAP)
1245         unsigned int                    in_ubsan;
1246 #endif
1247
1248         /* Journalling filesystem info: */
1249         void                            *journal_info;
1250
1251         /* Stacked block device info: */
1252         struct bio_list                 *bio_list;
1253
1254         /* Stack plugging: */
1255         struct blk_plug                 *plug;
1256
1257         /* VM state: */
1258         struct reclaim_state            *reclaim_state;
1259
1260         struct io_context               *io_context;
1261
1262 #ifdef CONFIG_COMPACTION
1263         struct capture_control          *capture_control;
1264 #endif
1265         /* Ptrace state: */
1266         unsigned long                   ptrace_message;
1267         kernel_siginfo_t                *last_siginfo;
1268
1269         struct task_io_accounting       ioac;
1270 #ifdef CONFIG_PSI
1271         /* Pressure stall state */
1272         unsigned int                    psi_flags;
1273 #endif
1274 #ifdef CONFIG_TASK_XACCT
1275         /* Accumulated RSS usage: */
1276         u64                             acct_rss_mem1;
1277         /* Accumulated virtual memory usage: */
1278         u64                             acct_vm_mem1;
1279         /* stime + utime since last update: */
1280         u64                             acct_timexpd;
1281 #endif
1282 #ifdef CONFIG_CPUSETS
1283         /* Protected by ->alloc_lock: */
1284         nodemask_t                      mems_allowed;
1285         /* Sequence number to catch updates: */
1286         seqcount_spinlock_t             mems_allowed_seq;
1287         int                             cpuset_mem_spread_rotor;
1288 #endif
1289 #ifdef CONFIG_CGROUPS
1290         /* Control Group info protected by css_set_lock: */
1291         struct css_set __rcu            *cgroups;
1292         /* cg_list protected by css_set_lock and tsk->alloc_lock: */
1293         struct list_head                cg_list;
1294 #endif
1295 #ifdef CONFIG_X86_CPU_RESCTRL
1296         u32                             closid;
1297         u32                             rmid;
1298 #endif
1299 #ifdef CONFIG_FUTEX
1300         struct robust_list_head __user  *robust_list;
1301 #ifdef CONFIG_COMPAT
1302         struct compat_robust_list_head __user *compat_robust_list;
1303 #endif
1304         struct list_head                pi_state_list;
1305         struct futex_pi_state           *pi_state_cache;
1306         struct mutex                    futex_exit_mutex;
1307         unsigned int                    futex_state;
1308 #endif
1309 #ifdef CONFIG_PERF_EVENTS
1310         u8                              perf_recursion[PERF_NR_CONTEXTS];
1311         struct perf_event_context       *perf_event_ctxp;
1312         struct mutex                    perf_event_mutex;
1313         struct list_head                perf_event_list;
1314 #endif
1315 #ifdef CONFIG_DEBUG_PREEMPT
1316         unsigned long                   preempt_disable_ip;
1317 #endif
1318 #ifdef CONFIG_NUMA
1319         /* Protected by alloc_lock: */
1320         struct mempolicy                *mempolicy;
1321         short                           il_prev;
1322         u8                              il_weight;
1323         short                           pref_node_fork;
1324 #endif
1325 #ifdef CONFIG_NUMA_BALANCING
1326         int                             numa_scan_seq;
1327         unsigned int                    numa_scan_period;
1328         unsigned int                    numa_scan_period_max;
1329         int                             numa_preferred_nid;
1330         unsigned long                   numa_migrate_retry;
1331         /* Migration stamp: */
1332         u64                             node_stamp;
1333         u64                             last_task_numa_placement;
1334         u64                             last_sum_exec_runtime;
1335         struct callback_head            numa_work;
1336
1337         /*
1338          * This pointer is only modified for current in syscall and
1339          * pagefault context (and for tasks being destroyed), so it can be read
1340          * from any of the following contexts:
1341          *  - RCU read-side critical section
1342          *  - current->numa_group from everywhere
1343          *  - task's runqueue locked, task not running
1344          */
1345         struct numa_group __rcu         *numa_group;
1346
1347         /*
1348          * numa_faults is an array split into four regions:
1349          * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
1350          * in this precise order.
1351          *
1352          * faults_memory: Exponential decaying average of faults on a per-node
1353          * basis. Scheduling placement decisions are made based on these
1354          * counts. The values remain static for the duration of a PTE scan.
1355          * faults_cpu: Track the nodes the process was running on when a NUMA
1356          * hinting fault was incurred.
1357          * faults_memory_buffer and faults_cpu_buffer: Record faults per node
1358          * during the current scan window. When the scan completes, the counts
1359          * in faults_memory and faults_cpu decay and these values are copied.
1360          */
1361         unsigned long                   *numa_faults;
1362         unsigned long                   total_numa_faults;
1363
1364         /*
1365          * numa_faults_locality tracks if faults recorded during the last
1366          * scan window were remote/local or failed to migrate. The task scan
1367          * period is adapted based on the locality of the faults with different
1368          * weights depending on whether they were shared or private faults
1369          */
1370         unsigned long                   numa_faults_locality[3];
1371
1372         unsigned long                   numa_pages_migrated;
1373 #endif /* CONFIG_NUMA_BALANCING */
1374
1375 #ifdef CONFIG_RSEQ
1376         struct rseq __user *rseq;
1377         u32 rseq_len;
1378         u32 rseq_sig;
1379         /*
1380          * RmW on rseq_event_mask must be performed atomically
1381          * with respect to preemption.
1382          */
1383         unsigned long rseq_event_mask;
1384 # ifdef CONFIG_DEBUG_RSEQ
1385         /*
1386          * This is a place holder to save a copy of the rseq fields for
1387          * validation of read-only fields. The struct rseq has a
1388          * variable-length array at the end, so it cannot be used
1389          * directly. Reserve a size large enough for the known fields.
1390          */
1391         char                            rseq_fields[sizeof(struct rseq)];
1392 # endif
1393 #endif
1394
1395 #ifdef CONFIG_SCHED_MM_CID
1396         int                             mm_cid;         /* Current cid in mm */
1397         int                             last_mm_cid;    /* Most recent cid in mm */
1398         int                             migrate_from_cpu;
1399         int                             mm_cid_active;  /* Whether cid bitmap is active */
1400         struct callback_head            cid_work;
1401 #endif
1402
1403         struct tlbflush_unmap_batch     tlb_ubc;
1404
1405         /* Cache last used pipe for splice(): */
1406         struct pipe_inode_info          *splice_pipe;
1407
1408         struct page_frag                task_frag;
1409
1410 #ifdef CONFIG_TASK_DELAY_ACCT
1411         struct task_delay_info          *delays;
1412 #endif
1413
1414 #ifdef CONFIG_FAULT_INJECTION
1415         int                             make_it_fail;
1416         unsigned int                    fail_nth;
1417 #endif
1418         /*
1419          * When (nr_dirtied >= nr_dirtied_pause), it's time to call
1420          * balance_dirty_pages() for a dirty throttling pause:
1421          */
1422         int                             nr_dirtied;
1423         int                             nr_dirtied_pause;
1424         /* Start of a write-and-pause period: */
1425         unsigned long                   dirty_paused_when;
1426
1427 #ifdef CONFIG_LATENCYTOP
1428         int                             latency_record_count;
1429         struct latency_record           latency_record[LT_SAVECOUNT];
1430 #endif
1431         /*
1432          * Time slack values; these are used to round up poll() and
1433          * select() etc timeout values. These are in nanoseconds.
1434          */
1435         u64                             timer_slack_ns;
1436         u64                             default_timer_slack_ns;
1437
1438 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
1439         unsigned int                    kasan_depth;
1440 #endif
1441
1442 #ifdef CONFIG_KCSAN
1443         struct kcsan_ctx                kcsan_ctx;
1444 #ifdef CONFIG_TRACE_IRQFLAGS
1445         struct irqtrace_events          kcsan_save_irqtrace;
1446 #endif
1447 #ifdef CONFIG_KCSAN_WEAK_MEMORY
1448         int                             kcsan_stack_depth;
1449 #endif
1450 #endif
1451
1452 #ifdef CONFIG_KMSAN
1453         struct kmsan_ctx                kmsan_ctx;
1454 #endif
1455
1456 #if IS_ENABLED(CONFIG_KUNIT)
1457         struct kunit                    *kunit_test;
1458 #endif
1459
1460 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1461         /* Index of current stored address in ret_stack: */
1462         int                             curr_ret_stack;
1463         int                             curr_ret_depth;
1464
1465         /* Stack of return addresses for return function tracing: */
1466         unsigned long                   *ret_stack;
1467
1468         /* Timestamp for last schedule: */
1469         unsigned long long              ftrace_timestamp;
1470         unsigned long long              ftrace_sleeptime;
1471
1472         /*
1473          * Number of functions that haven't been traced
1474          * because of depth overrun:
1475          */
1476         atomic_t                        trace_overrun;
1477
1478         /* Pause tracing: */
1479         atomic_t                        tracing_graph_pause;
1480 #endif
1481
1482 #ifdef CONFIG_TRACING
1483         /* Bitmask and counter of trace recursion: */
1484         unsigned long                   trace_recursion;
1485 #endif /* CONFIG_TRACING */
1486
1487 #ifdef CONFIG_KCOV
1488         /* See kernel/kcov.c for more details. */
1489
1490         /* Coverage collection mode enabled for this task (0 if disabled): */
1491         unsigned int                    kcov_mode;
1492
1493         /* Size of the kcov_area: */
1494         unsigned int                    kcov_size;
1495
1496         /* Buffer for coverage collection: */
1497         void                            *kcov_area;
1498
1499         /* KCOV descriptor wired with this task or NULL: */
1500         struct kcov                     *kcov;
1501
1502         /* KCOV common handle for remote coverage collection: */
1503         u64                             kcov_handle;
1504
1505         /* KCOV sequence number: */
1506         int                             kcov_sequence;
1507
1508         /* Collect coverage from softirq context: */
1509         unsigned int                    kcov_softirq;
1510 #endif
1511
1512 #ifdef CONFIG_MEMCG_V1
1513         struct mem_cgroup               *memcg_in_oom;
1514 #endif
1515
1516 #ifdef CONFIG_MEMCG
1517         /* Number of pages to reclaim on returning to userland: */
1518         unsigned int                    memcg_nr_pages_over_high;
1519
1520         /* Used by memcontrol for targeted memcg charge: */
1521         struct mem_cgroup               *active_memcg;
1522
1523         /* Cache for current->cgroups->memcg->objcg lookups: */
1524         struct obj_cgroup               *objcg;
1525 #endif
1526
1527 #ifdef CONFIG_BLK_CGROUP
1528         struct gendisk                  *throttle_disk;
1529 #endif
1530
1531 #ifdef CONFIG_UPROBES
1532         struct uprobe_task              *utask;
1533 #endif
1534 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1535         unsigned int                    sequential_io;
1536         unsigned int                    sequential_io_avg;
1537 #endif
1538         struct kmap_ctrl                kmap_ctrl;
1539 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
1540         unsigned long                   task_state_change;
1541 # ifdef CONFIG_PREEMPT_RT
1542         unsigned long                   saved_state_change;
1543 # endif
1544 #endif
1545         struct rcu_head                 rcu;
1546         refcount_t                      rcu_users;
1547         int                             pagefault_disabled;
1548 #ifdef CONFIG_MMU
1549         struct task_struct              *oom_reaper_list;
1550         struct timer_list               oom_reaper_timer;
1551 #endif
1552 #ifdef CONFIG_VMAP_STACK
1553         struct vm_struct                *stack_vm_area;
1554 #endif
1555 #ifdef CONFIG_THREAD_INFO_IN_TASK
1556         /* A live task holds one reference: */
1557         refcount_t                      stack_refcount;
1558 #endif
1559 #ifdef CONFIG_LIVEPATCH
1560         int patch_state;
1561 #endif
1562 #ifdef CONFIG_SECURITY
1563         /* Used by LSM modules for access restriction: */
1564         void                            *security;
1565 #endif
1566 #ifdef CONFIG_BPF_SYSCALL
1567         /* Used by BPF task local storage */
1568         struct bpf_local_storage __rcu  *bpf_storage;
1569         /* Used for BPF run context */
1570         struct bpf_run_ctx              *bpf_ctx;
1571 #endif
1572         /* Used by BPF for per-TASK xdp storage */
1573         struct bpf_net_context          *bpf_net_context;
1574
1575 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
1576         unsigned long                   lowest_stack;
1577         unsigned long                   prev_lowest_stack;
1578 #endif
1579
1580 #ifdef CONFIG_X86_MCE
1581         void __user                     *mce_vaddr;
1582         __u64                           mce_kflags;
1583         u64                             mce_addr;
1584         __u64                           mce_ripv : 1,
1585                                         mce_whole_page : 1,
1586                                         __mce_reserved : 62;
1587         struct callback_head            mce_kill_me;
1588         int                             mce_count;
1589 #endif
1590
1591 #ifdef CONFIG_KRETPROBES
1592         struct llist_head               kretprobe_instances;
1593 #endif
1594 #ifdef CONFIG_RETHOOK
1595         struct llist_head               rethooks;
1596 #endif
1597
1598 #ifdef CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH
1599         /*
1600          * If L1D flush is supported on mm context switch
1601          * then we use this callback head to queue kill work
1602          * to kill tasks that are not running on SMT disabled
1603          * cores
1604          */
1605         struct callback_head            l1d_flush_kill;
1606 #endif
1607
1608 #ifdef CONFIG_RV
1609         /*
1610          * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS.
1611          * If we find justification for more monitors, we can think
1612          * about adding more or developing a dynamic method. So far,
1613          * none of these are justified.
1614          */
1615         union rv_task_monitor           rv[RV_PER_TASK_MONITORS];
1616 #endif
1617
1618 #ifdef CONFIG_USER_EVENTS
1619         struct user_event_mm            *user_event_mm;
1620 #endif
1621
1622         /*
1623          * New fields for task_struct should be added above here, so that
1624          * they are included in the randomized portion of task_struct.
1625          */
1626         randomized_struct_fields_end
1627
1628         /* CPU-specific state of this task: */
1629         struct thread_struct            thread;
1630
1631         /*
1632          * WARNING: on x86, 'thread_struct' contains a variable-sized
1633          * structure.  It *MUST* be at the end of 'task_struct'.
1634          *
1635          * Do not put anything below here!
1636          */
1637 };
1638
1639 #define TASK_REPORT_IDLE        (TASK_REPORT + 1)
1640 #define TASK_REPORT_MAX         (TASK_REPORT_IDLE << 1)
1641
1642 static inline unsigned int __task_state_index(unsigned int tsk_state,
1643                                               unsigned int tsk_exit_state)
1644 {
1645         unsigned int state = (tsk_state | tsk_exit_state) & TASK_REPORT;
1646
1647         BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
1648
1649         if ((tsk_state & TASK_IDLE) == TASK_IDLE)
1650                 state = TASK_REPORT_IDLE;
1651
1652         /*
1653          * We're lying here, but rather than expose a completely new task state
1654          * to userspace, we can make this appear as if the task has gone through
1655          * a regular rt_mutex_lock() call.
1656          * Report frozen tasks as uninterruptible.
1657          */
1658         if ((tsk_state & TASK_RTLOCK_WAIT) || (tsk_state & TASK_FROZEN))
1659                 state = TASK_UNINTERRUPTIBLE;
1660
1661         return fls(state);
1662 }
1663
1664 static inline unsigned int task_state_index(struct task_struct *tsk)
1665 {
1666         return __task_state_index(READ_ONCE(tsk->__state), tsk->exit_state);
1667 }
1668
1669 static inline char task_index_to_char(unsigned int state)
1670 {
1671         static const char state_char[] = "RSDTtXZPI";
1672
1673         BUILD_BUG_ON(TASK_REPORT_MAX * 2 != 1 << (sizeof(state_char) - 1));
1674
1675         return state_char[state];
1676 }
1677
1678 static inline char task_state_to_char(struct task_struct *tsk)
1679 {
1680         return task_index_to_char(task_state_index(tsk));
1681 }
1682
1683 extern struct pid *cad_pid;
1684
1685 /*
1686  * Per process flags
1687  */
1688 #define PF_VCPU                 0x00000001      /* I'm a virtual CPU */
1689 #define PF_IDLE                 0x00000002      /* I am an IDLE thread */
1690 #define PF_EXITING              0x00000004      /* Getting shut down */
1691 #define PF_POSTCOREDUMP         0x00000008      /* Coredumps should ignore this task */
1692 #define PF_IO_WORKER            0x00000010      /* Task is an IO worker */
1693 #define PF_WQ_WORKER            0x00000020      /* I'm a workqueue worker */
1694 #define PF_FORKNOEXEC           0x00000040      /* Forked but didn't exec */
1695 #define PF_MCE_PROCESS          0x00000080      /* Process policy on mce errors */
1696 #define PF_SUPERPRIV            0x00000100      /* Used super-user privileges */
1697 #define PF_DUMPCORE             0x00000200      /* Dumped core */
1698 #define PF_SIGNALED             0x00000400      /* Killed by a signal */
1699 #define PF_MEMALLOC             0x00000800      /* Allocating memory to free memory. See memalloc_noreclaim_save() */
1700 #define PF_NPROC_EXCEEDED       0x00001000      /* set_user() noticed that RLIMIT_NPROC was exceeded */
1701 #define PF_USED_MATH            0x00002000      /* If unset the fpu must be initialized before use */
1702 #define PF_USER_WORKER          0x00004000      /* Kernel thread cloned from userspace thread */
1703 #define PF_NOFREEZE             0x00008000      /* This thread should not be frozen */
1704 #define PF__HOLE__00010000      0x00010000
1705 #define PF_KSWAPD               0x00020000      /* I am kswapd */
1706 #define PF_MEMALLOC_NOFS        0x00040000      /* All allocations inherit GFP_NOFS. See memalloc_nfs_save() */
1707 #define PF_MEMALLOC_NOIO        0x00080000      /* All allocations inherit GFP_NOIO. See memalloc_noio_save() */
1708 #define PF_LOCAL_THROTTLE       0x00100000      /* Throttle writes only against the bdi I write to,
1709                                                  * I am cleaning dirty pages from some other bdi. */
1710 #define PF_KTHREAD              0x00200000      /* I am a kernel thread */
1711 #define PF_RANDOMIZE            0x00400000      /* Randomize virtual address space */
1712 #define PF__HOLE__00800000      0x00800000
1713 #define PF__HOLE__01000000      0x01000000
1714 #define PF__HOLE__02000000      0x02000000
1715 #define PF_NO_SETAFFINITY       0x04000000      /* Userland is not allowed to meddle with cpus_mask */
1716 #define PF_MCE_EARLY            0x08000000      /* Early kill for mce process policy */
1717 #define PF_MEMALLOC_PIN         0x10000000      /* Allocations constrained to zones which allow long term pinning.
1718                                                  * See memalloc_pin_save() */
1719 #define PF_BLOCK_TS             0x20000000      /* plug has ts that needs updating */
1720 #define PF__HOLE__40000000      0x40000000
1721 #define PF_SUSPEND_TASK         0x80000000      /* This thread called freeze_processes() and should not be frozen */
1722
1723 /*
1724  * Only the _current_ task can read/write to tsk->flags, but other
1725  * tasks can access tsk->flags in readonly mode for example
1726  * with tsk_used_math (like during threaded core dumping).
1727  * There is however an exception to this rule during ptrace
1728  * or during fork: the ptracer task is allowed to write to the
1729  * child->flags of its traced child (same goes for fork, the parent
1730  * can write to the child->flags), because we're guaranteed the
1731  * child is not running and in turn not changing child->flags
1732  * at the same time the parent does it.
1733  */
1734 #define clear_stopped_child_used_math(child)    do { (child)->flags &= ~PF_USED_MATH; } while (0)
1735 #define set_stopped_child_used_math(child)      do { (child)->flags |= PF_USED_MATH; } while (0)
1736 #define clear_used_math()                       clear_stopped_child_used_math(current)
1737 #define set_used_math()                         set_stopped_child_used_math(current)
1738
1739 #define conditional_stopped_child_used_math(condition, child) \
1740         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1741
1742 #define conditional_used_math(condition)        conditional_stopped_child_used_math(condition, current)
1743
1744 #define copy_to_stopped_child_used_math(child) \
1745         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1746
1747 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1748 #define tsk_used_math(p)                        ((p)->flags & PF_USED_MATH)
1749 #define used_math()                             tsk_used_math(current)
1750
1751 static __always_inline bool is_percpu_thread(void)
1752 {
1753 #ifdef CONFIG_SMP
1754         return (current->flags & PF_NO_SETAFFINITY) &&
1755                 (current->nr_cpus_allowed  == 1);
1756 #else
1757         return true;
1758 #endif
1759 }
1760
1761 /* Per-process atomic flags. */
1762 #define PFA_NO_NEW_PRIVS                0       /* May not gain new privileges. */
1763 #define PFA_SPREAD_PAGE                 1       /* Spread page cache over cpuset */
1764 #define PFA_SPREAD_SLAB                 2       /* Spread some slab caches over cpuset */
1765 #define PFA_SPEC_SSB_DISABLE            3       /* Speculative Store Bypass disabled */
1766 #define PFA_SPEC_SSB_FORCE_DISABLE      4       /* Speculative Store Bypass force disabled*/
1767 #define PFA_SPEC_IB_DISABLE             5       /* Indirect branch speculation restricted */
1768 #define PFA_SPEC_IB_FORCE_DISABLE       6       /* Indirect branch speculation permanently restricted */
1769 #define PFA_SPEC_SSB_NOEXEC             7       /* Speculative Store Bypass clear on execve() */
1770
1771 #define TASK_PFA_TEST(name, func)                                       \
1772         static inline bool task_##func(struct task_struct *p)           \
1773         { return test_bit(PFA_##name, &p->atomic_flags); }
1774
1775 #define TASK_PFA_SET(name, func)                                        \
1776         static inline void task_set_##func(struct task_struct *p)       \
1777         { set_bit(PFA_##name, &p->atomic_flags); }
1778
1779 #define TASK_PFA_CLEAR(name, func)                                      \
1780         static inline void task_clear_##func(struct task_struct *p)     \
1781         { clear_bit(PFA_##name, &p->atomic_flags); }
1782
1783 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
1784 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
1785
1786 TASK_PFA_TEST(SPREAD_PAGE, spread_page)
1787 TASK_PFA_SET(SPREAD_PAGE, spread_page)
1788 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)
1789
1790 TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
1791 TASK_PFA_SET(SPREAD_SLAB, spread_slab)
1792 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
1793
1794 TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
1795 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
1796 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
1797
1798 TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1799 TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1800 TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
1801
1802 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1803 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
1804
1805 TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable)
1806 TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable)
1807 TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable)
1808
1809 TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1810 TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable)
1811
1812 static inline void
1813 current_restore_flags(unsigned long orig_flags, unsigned long flags)
1814 {
1815         current->flags &= ~flags;
1816         current->flags |= orig_flags & flags;
1817 }
1818
1819 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
1820 extern int task_can_attach(struct task_struct *p);
1821 extern int dl_bw_alloc(int cpu, u64 dl_bw);
1822 extern void dl_bw_free(int cpu, u64 dl_bw);
1823 #ifdef CONFIG_SMP
1824
1825 /* do_set_cpus_allowed() - consider using set_cpus_allowed_ptr() instead */
1826 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
1827
1828 /**
1829  * set_cpus_allowed_ptr - set CPU affinity mask of a task
1830  * @p: the task
1831  * @new_mask: CPU affinity mask
1832  *
1833  * Return: zero if successful, or a negative error code
1834  */
1835 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
1836 extern int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node);
1837 extern void release_user_cpus_ptr(struct task_struct *p);
1838 extern int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask);
1839 extern void force_compatible_cpus_allowed_ptr(struct task_struct *p);
1840 extern void relax_compatible_cpus_allowed_ptr(struct task_struct *p);
1841 #else
1842 static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
1843 {
1844 }
1845 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
1846 {
1847         /* Opencoded cpumask_test_cpu(0, new_mask) to avoid dependency on cpumask.h */
1848         if ((*cpumask_bits(new_mask) & 1) == 0)
1849                 return -EINVAL;
1850         return 0;
1851 }
1852 static inline int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int node)
1853 {
1854         if (src->user_cpus_ptr)
1855                 return -EINVAL;
1856         return 0;
1857 }
1858 static inline void release_user_cpus_ptr(struct task_struct *p)
1859 {
1860         WARN_ON(p->user_cpus_ptr);
1861 }
1862
1863 static inline int dl_task_check_affinity(struct task_struct *p, const struct cpumask *mask)
1864 {
1865         return 0;
1866 }
1867 #endif
1868
1869 extern int yield_to(struct task_struct *p, bool preempt);
1870 extern void set_user_nice(struct task_struct *p, long nice);
1871 extern int task_prio(const struct task_struct *p);
1872
1873 /**
1874  * task_nice - return the nice value of a given task.
1875  * @p: the task in question.
1876  *
1877  * Return: The nice value [ -20 ... 0 ... 19 ].
1878  */
1879 static inline int task_nice(const struct task_struct *p)
1880 {
1881         return PRIO_TO_NICE((p)->static_prio);
1882 }
1883
1884 extern int can_nice(const struct task_struct *p, const int nice);
1885 extern int task_curr(const struct task_struct *p);
1886 extern int idle_cpu(int cpu);
1887 extern int available_idle_cpu(int cpu);
1888 extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
1889 extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
1890 extern void sched_set_fifo(struct task_struct *p);
1891 extern void sched_set_fifo_low(struct task_struct *p);
1892 extern void sched_set_normal(struct task_struct *p, int nice);
1893 extern int sched_setattr(struct task_struct *, const struct sched_attr *);
1894 extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *);
1895 extern struct task_struct *idle_task(int cpu);
1896
1897 /**
1898  * is_idle_task - is the specified task an idle task?
1899  * @p: the task in question.
1900  *
1901  * Return: 1 if @p is an idle task. 0 otherwise.
1902  */
1903 static __always_inline bool is_idle_task(const struct task_struct *p)
1904 {
1905         return !!(p->flags & PF_IDLE);
1906 }
1907
1908 extern struct task_struct *curr_task(int cpu);
1909 extern void ia64_set_curr_task(int cpu, struct task_struct *p);
1910
1911 void yield(void);
1912
1913 union thread_union {
1914         struct task_struct task;
1915 #ifndef CONFIG_THREAD_INFO_IN_TASK
1916         struct thread_info thread_info;
1917 #endif
1918         unsigned long stack[THREAD_SIZE/sizeof(long)];
1919 };
1920
1921 #ifndef CONFIG_THREAD_INFO_IN_TASK
1922 extern struct thread_info init_thread_info;
1923 #endif
1924
1925 extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)];
1926
1927 #ifdef CONFIG_THREAD_INFO_IN_TASK
1928 # define task_thread_info(task) (&(task)->thread_info)
1929 #else
1930 # define task_thread_info(task) ((struct thread_info *)(task)->stack)
1931 #endif
1932
1933 /*
1934  * find a task by one of its numerical ids
1935  *
1936  * find_task_by_pid_ns():
1937  *      finds a task by its pid in the specified namespace
1938  * find_task_by_vpid():
1939  *      finds a task by its virtual pid
1940  *
1941  * see also find_vpid() etc in include/linux/pid.h
1942  */
1943
1944 extern struct task_struct *find_task_by_vpid(pid_t nr);
1945 extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);
1946
1947 /*
1948  * find a task by its virtual pid and get the task struct
1949  */
1950 extern struct task_struct *find_get_task_by_vpid(pid_t nr);
1951
1952 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1953 extern int wake_up_process(struct task_struct *tsk);
1954 extern void wake_up_new_task(struct task_struct *tsk);
1955
1956 #ifdef CONFIG_SMP
1957 extern void kick_process(struct task_struct *tsk);
1958 #else
1959 static inline void kick_process(struct task_struct *tsk) { }
1960 #endif
1961
1962 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
1963 #define set_task_comm(tsk, from) ({                     \
1964         BUILD_BUG_ON(sizeof(from) != TASK_COMM_LEN);    \
1965         __set_task_comm(tsk, from, false);              \
1966 })
1967
1968 /*
1969  * - Why not use task_lock()?
1970  *   User space can randomly change their names anyway, so locking for readers
1971  *   doesn't make sense. For writers, locking is probably necessary, as a race
1972  *   condition could lead to long-term mixed results.
1973  *   The strscpy_pad() in __set_task_comm() can ensure that the task comm is
1974  *   always NUL-terminated and zero-padded. Therefore the race condition between
1975  *   reader and writer is not an issue.
1976  *
1977  * - BUILD_BUG_ON() can help prevent the buf from being truncated.
1978  *   Since the callers don't perform any return value checks, this safeguard is
1979  *   necessary.
1980  */
1981 #define get_task_comm(buf, tsk) ({                      \
1982         BUILD_BUG_ON(sizeof(buf) < TASK_COMM_LEN);      \
1983         strscpy_pad(buf, (tsk)->comm);                  \
1984         buf;                                            \
1985 })
1986
1987 #ifdef CONFIG_SMP
1988 static __always_inline void scheduler_ipi(void)
1989 {
1990         /*
1991          * Fold TIF_NEED_RESCHED into the preempt_count; anybody setting
1992          * TIF_NEED_RESCHED remotely (for the first time) will also send
1993          * this IPI.
1994          */
1995         preempt_fold_need_resched();
1996 }
1997 #else
1998 static inline void scheduler_ipi(void) { }
1999 #endif
2000
2001 extern unsigned long wait_task_inactive(struct task_struct *, unsigned int match_state);
2002
2003 /*
2004  * Set thread flags in other task's structures.
2005  * See asm/thread_info.h for TIF_xxxx flags available:
2006  */
2007 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2008 {
2009         set_ti_thread_flag(task_thread_info(tsk), flag);
2010 }
2011
2012 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2013 {
2014         clear_ti_thread_flag(task_thread_info(tsk), flag);
2015 }
2016
2017 static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag,
2018                                           bool value)
2019 {
2020         update_ti_thread_flag(task_thread_info(tsk), flag, value);
2021 }
2022
2023 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2024 {
2025         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2026 }
2027
2028 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2029 {
2030         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2031 }
2032
2033 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2034 {
2035         return test_ti_thread_flag(task_thread_info(tsk), flag);
2036 }
2037
2038 static inline void set_tsk_need_resched(struct task_struct *tsk)
2039 {
2040         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2041 }
2042
2043 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2044 {
2045         atomic_long_andnot(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY,
2046                            (atomic_long_t *)&task_thread_info(tsk)->flags);
2047 }
2048
2049 static inline int test_tsk_need_resched(struct task_struct *tsk)
2050 {
2051         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2052 }
2053
2054 /*
2055  * cond_resched() and cond_resched_lock(): latency reduction via
2056  * explicit rescheduling in places that are safe. The return
2057  * value indicates whether a reschedule was done in fact.
2058  * cond_resched_lock() will drop the spinlock before scheduling,
2059  */
2060 #if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC)
2061 extern int __cond_resched(void);
2062
2063 #if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)
2064
2065 void sched_dynamic_klp_enable(void);
2066 void sched_dynamic_klp_disable(void);
2067
2068 DECLARE_STATIC_CALL(cond_resched, __cond_resched);
2069
2070 static __always_inline int _cond_resched(void)
2071 {
2072         return static_call_mod(cond_resched)();
2073 }
2074
2075 #elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
2076
2077 extern int dynamic_cond_resched(void);
2078
2079 static __always_inline int _cond_resched(void)
2080 {
2081         return dynamic_cond_resched();
2082 }
2083
2084 #else /* !CONFIG_PREEMPTION */
2085
2086 static inline int _cond_resched(void)
2087 {
2088         klp_sched_try_switch();
2089         return __cond_resched();
2090 }
2091
2092 #endif /* PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_CALL */
2093
2094 #else /* CONFIG_PREEMPTION && !CONFIG_PREEMPT_DYNAMIC */
2095
2096 static inline int _cond_resched(void)
2097 {
2098         klp_sched_try_switch();
2099         return 0;
2100 }
2101
2102 #endif /* !CONFIG_PREEMPTION || CONFIG_PREEMPT_DYNAMIC */
2103
2104 #define cond_resched() ({                       \
2105         __might_resched(__FILE__, __LINE__, 0); \
2106         _cond_resched();                        \
2107 })
2108
2109 extern int __cond_resched_lock(spinlock_t *lock);
2110 extern int __cond_resched_rwlock_read(rwlock_t *lock);
2111 extern int __cond_resched_rwlock_write(rwlock_t *lock);
2112
2113 #define MIGHT_RESCHED_RCU_SHIFT         8
2114 #define MIGHT_RESCHED_PREEMPT_MASK      ((1U << MIGHT_RESCHED_RCU_SHIFT) - 1)
2115
2116 #ifndef CONFIG_PREEMPT_RT
2117 /*
2118  * Non RT kernels have an elevated preempt count due to the held lock,
2119  * but are not allowed to be inside a RCU read side critical section
2120  */
2121 # define PREEMPT_LOCK_RESCHED_OFFSETS   PREEMPT_LOCK_OFFSET
2122 #else
2123 /*
2124  * spin/rw_lock() on RT implies rcu_read_lock(). The might_sleep() check in
2125  * cond_resched*lock() has to take that into account because it checks for
2126  * preempt_count() and rcu_preempt_depth().
2127  */
2128 # define PREEMPT_LOCK_RESCHED_OFFSETS   \
2129         (PREEMPT_LOCK_OFFSET + (1U << MIGHT_RESCHED_RCU_SHIFT))
2130 #endif
2131
2132 #define cond_resched_lock(lock) ({                                              \
2133         __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS);      \
2134         __cond_resched_lock(lock);                                              \
2135 })
2136
2137 #define cond_resched_rwlock_read(lock) ({                                       \
2138         __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS);      \
2139         __cond_resched_rwlock_read(lock);                                       \
2140 })
2141
2142 #define cond_resched_rwlock_write(lock) ({                                      \
2143         __might_resched(__FILE__, __LINE__, PREEMPT_LOCK_RESCHED_OFFSETS);      \
2144         __cond_resched_rwlock_write(lock);                                      \
2145 })
2146
2147 static __always_inline bool need_resched(void)
2148 {
2149         return unlikely(tif_need_resched());
2150 }
2151
2152 /*
2153  * Wrappers for p->thread_info->cpu access. No-op on UP.
2154  */
2155 #ifdef CONFIG_SMP
2156
2157 static inline unsigned int task_cpu(const struct task_struct *p)
2158 {
2159         return READ_ONCE(task_thread_info(p)->cpu);
2160 }
2161
2162 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2163
2164 #else
2165
2166 static inline unsigned int task_cpu(const struct task_struct *p)
2167 {
2168         return 0;
2169 }
2170
2171 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2172 {
2173 }
2174
2175 #endif /* CONFIG_SMP */
2176
2177 static inline bool task_is_runnable(struct task_struct *p)
2178 {
2179         return p->on_rq && !p->se.sched_delayed;
2180 }
2181
2182 extern bool sched_task_on_rq(struct task_struct *p);
2183 extern unsigned long get_wchan(struct task_struct *p);
2184 extern struct task_struct *cpu_curr_snapshot(int cpu);
2185
2186 #include <linux/spinlock.h>
2187
2188 /*
2189  * In order to reduce various lock holder preemption latencies provide an
2190  * interface to see if a vCPU is currently running or not.
2191  *
2192  * This allows us to terminate optimistic spin loops and block, analogous to
2193  * the native optimistic spin heuristic of testing if the lock owner task is
2194  * running or not.
2195  */
2196 #ifndef vcpu_is_preempted
2197 static inline bool vcpu_is_preempted(int cpu)
2198 {
2199         return false;
2200 }
2201 #endif
2202
2203 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2204 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2205
2206 #ifndef TASK_SIZE_OF
2207 #define TASK_SIZE_OF(tsk)       TASK_SIZE
2208 #endif
2209
2210 #ifdef CONFIG_SMP
2211 static inline bool owner_on_cpu(struct task_struct *owner)
2212 {
2213         /*
2214          * As lock holder preemption issue, we both skip spinning if
2215          * task is not on cpu or its cpu is preempted
2216          */
2217         return READ_ONCE(owner->on_cpu) && !vcpu_is_preempted(task_cpu(owner));
2218 }
2219
2220 /* Returns effective CPU energy utilization, as seen by the scheduler */
2221 unsigned long sched_cpu_util(int cpu);
2222 #endif /* CONFIG_SMP */
2223
2224 #ifdef CONFIG_SCHED_CORE
2225 extern void sched_core_free(struct task_struct *tsk);
2226 extern void sched_core_fork(struct task_struct *p);
2227 extern int sched_core_share_pid(unsigned int cmd, pid_t pid, enum pid_type type,
2228                                 unsigned long uaddr);
2229 extern int sched_core_idle_cpu(int cpu);
2230 #else
2231 static inline void sched_core_free(struct task_struct *tsk) { }
2232 static inline void sched_core_fork(struct task_struct *p) { }
2233 static inline int sched_core_idle_cpu(int cpu) { return idle_cpu(cpu); }
2234 #endif
2235
2236 extern void sched_set_stop_task(int cpu, struct task_struct *stop);
2237
2238 #ifdef CONFIG_MEM_ALLOC_PROFILING
2239 static __always_inline struct alloc_tag *alloc_tag_save(struct alloc_tag *tag)
2240 {
2241         swap(current->alloc_tag, tag);
2242         return tag;
2243 }
2244
2245 static __always_inline void alloc_tag_restore(struct alloc_tag *tag, struct alloc_tag *old)
2246 {
2247 #ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG
2248         WARN(current->alloc_tag != tag, "current->alloc_tag was changed:\n");
2249 #endif
2250         current->alloc_tag = old;
2251 }
2252 #else
2253 #define alloc_tag_save(_tag)                    NULL
2254 #define alloc_tag_restore(_tag, _old)           do {} while (0)
2255 #endif
2256
2257 #endif