1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4 #include <uapi/linux/sched.h>
5
6
7 struct ccs_domain_info;
8
9 struct sched_param {
10 int sched_priority;
11 };
12
13 #include <asm/param.h> /* for HZ */
14
15 #include <linux/capability.h>
16 #include <linux/threads.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/timex.h>
20 #include <linux/jiffies.h>
21 #include <linux/rbtree.h>
22 #include <linux/thread_info.h>
23 #include <linux/cpumask.h>
24 #include <linux/errno.h>
25 #include <linux/nodemask.h>
26 #include <linux/mm_types.h>
27
28 #include <asm/page.h>
29 #include <asm/ptrace.h>
30 #include <asm/cputime.h>
31
32 #include <linux/smp.h>
33 #include <linux/sem.h>
34 #include <linux/signal.h>
35 #include <linux/compiler.h>
36 #include <linux/completion.h>
37 #include <linux/pid.h>
38 #include <linux/percpu.h>
39 #include <linux/topology.h>
40 #include <linux/proportions.h>
41 #include <linux/seccomp.h>
42 #include <linux/rcupdate.h>
43 #include <linux/rculist.h>
44 #include <linux/rtmutex.h>
45
46 #include <linux/time.h>
47 #include <linux/param.h>
48 #include <linux/resource.h>
49 #include <linux/timer.h>
50 #include <linux/hrtimer.h>
51 #include <linux/task_io_accounting.h>
52 #include <linux/latencytop.h>
53 #include <linux/cred.h>
54 #include <linux/llist.h>
55 #include <linux/uidgid.h>
56 #include <linux/gfp.h>
57
58 #include <asm/processor.h>
59
60 struct exec_domain;
61 struct futex_pi_state;
62 struct robust_list_head;
63 struct bio_list;
64 struct fs_struct;
65 struct perf_event_context;
66 struct blk_plug;
67
68 /*
69 * List of flags we want to share for kernel threads,
70 * if only because they are not used by them anyway.
71 */
72 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
73
74 /*
75 * These are the constant used to fake the fixed-point load-average
76 * counting. Some notes:
77 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
78 * a load-average precision of 10 bits integer + 11 bits fractional
79 * - if you want to count load-averages more often, you need more
80 * precision, or rounding will get you. With 2-second counting freq,
81 * the EXP_n values would be 1981, 2034 and 2043 if still using only
82 * 11 bit fractions.
83 */
84 extern unsigned long avenrun[]; /* Load averages */
85 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
86
87 #define FSHIFT 11 /* nr of bits of precision */
88 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
89 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
90 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
91 #define EXP_5 2014 /* 1/exp(5sec/5min) */
92 #define EXP_15 2037 /* 1/exp(5sec/15min) */
93
94 #define CALC_LOAD(load,exp,n) \
95 load *= exp; \
96 load += n*(FIXED_1-exp); \
97 load >>= FSHIFT;
98
99 extern unsigned long total_forks;
100 extern int nr_threads;
101 DECLARE_PER_CPU(unsigned long, process_counts);
102 extern int nr_processes(void);
103 extern unsigned long nr_running(void);
104 extern unsigned long nr_iowait(void);
105 extern unsigned long nr_iowait_cpu(int cpu);
106 extern unsigned long this_cpu_load(void);
107
108
109 extern void calc_global_load(unsigned long ticks);
110 extern void update_cpu_load_nohz(void);
111
112 /* Notifier for when a task gets migrated to a new CPU */
113 struct task_migration_notifier {
114 struct task_struct *task;
115 int from_cpu;
116 int to_cpu;
117 };
118 extern void register_task_migration_notifier(struct notifier_block *n);
119
120 extern unsigned long get_parent_ip(unsigned long addr);
121
122 extern void dump_cpu_task(int cpu);
123
124 struct seq_file;
125 struct cfs_rq;
126 struct task_group;
127 #ifdef CONFIG_SCHED_DEBUG
128 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
129 extern void proc_sched_set_task(struct task_struct *p);
130 extern void
131 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
132 #endif
133
134 /*
135 * Task state bitmask. NOTE! These bits are also
136 * encoded in fs/proc/array.c: get_task_state().
137 *
138 * We have two separate sets of flags: task->state
139 * is about runnability, while task->exit_state are
140 * about the task exiting. Confusing, but this way
141 * modifying one set can't modify the other one by
142 * mistake.
143 */
144 #define TASK_RUNNING 0
145 #define TASK_INTERRUPTIBLE 1
146 #define TASK_UNINTERRUPTIBLE 2
147 #define __TASK_STOPPED 4
148 #define __TASK_TRACED 8
149 /* in tsk->exit_state */
150 #define EXIT_ZOMBIE 16
151 #define EXIT_DEAD 32
152 /* in tsk->state again */
153 #define TASK_DEAD 64
154 #define TASK_WAKEKILL 128
155 #define TASK_WAKING 256
156 #define TASK_PARKED 512
157 #define TASK_STATE_MAX 1024
158
159 #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP"
160
161 extern char ___assert_task_state[1 - 2*!!(
162 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
163
164 /* Convenience macros for the sake of set_task_state */
165 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
166 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
167 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
168
169 /* Convenience macros for the sake of wake_up */
170 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
171 #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
172
173 /* get_task_state() */
174 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
175 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
176 __TASK_TRACED)
177
178 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
179 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
180 #define task_is_dead(task) ((task)->exit_state != 0)
181 #define task_is_stopped_or_traced(task) \
182 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
183 #define task_contributes_to_load(task) \
184 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
185 (task->flags & PF_FROZEN) == 0)
186
187 #define __set_task_state(tsk, state_value) \
188 do { (tsk)->state = (state_value); } while (0)
189 #define set_task_state(tsk, state_value) \
190 set_mb((tsk)->state, (state_value))
191
192 /*
193 * set_current_state() includes a barrier so that the write of current->state
194 * is correctly serialised wrt the caller's subsequent test of whether to
195 * actually sleep:
196 *
197 * set_current_state(TASK_UNINTERRUPTIBLE);
198 * if (do_i_need_to_sleep())
199 * schedule();
200 *
201 * If the caller does not need such serialisation then use __set_current_state()
202 */
203 #define __set_current_state(state_value) \
204 do { current->state = (state_value); } while (0)
205 #define set_current_state(state_value) \
206 set_mb(current->state, (state_value))
207
208 /* Task command name length */
209 #define TASK_COMM_LEN 16
210
211 #include <linux/spinlock.h>
212
213 /*
214 * This serializes "schedule()" and also protects
215 * the run-queue from deletions/modifications (but
216 * _adding_ to the beginning of the run-queue has
217 * a separate lock).
218 */
219 extern rwlock_t tasklist_lock;
220 extern spinlock_t mmlist_lock;
221
222 struct task_struct;
223
224 #ifdef CONFIG_PROVE_RCU
225 extern int lockdep_tasklist_lock_is_held(void);
226 #endif /* #ifdef CONFIG_PROVE_RCU */
227
228 extern void sched_init(void);
229 extern void sched_init_smp(void);
230 extern asmlinkage void schedule_tail(struct task_struct *prev);
231 extern void init_idle(struct task_struct *idle, int cpu);
232 extern void init_idle_bootup_task(struct task_struct *idle);
233
234 extern int runqueue_is_locked(int cpu);
235
236 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
237 extern void nohz_balance_enter_idle(int cpu);
238 extern void set_cpu_sd_state_idle(void);
239 extern int get_nohz_timer_target(void);
240 #else
241 static inline void nohz_balance_enter_idle(int cpu) { }
242 static inline void set_cpu_sd_state_idle(void) { }
243 #endif
244
245 /*
246 * Only dump TASK_* tasks. (0 for all tasks)
247 */
248 extern void show_state_filter(unsigned long state_filter);
249
250 static inline void show_state(void)
251 {
252 show_state_filter(0);
253 }
254
255 extern void show_regs(struct pt_regs *);
256
257 /*
258 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
259 * task), SP is the stack pointer of the first frame that should be shown in the back
260 * trace (or NULL if the entire call-chain of the task should be shown).
261 */
262 extern void show_stack(struct task_struct *task, unsigned long *sp);
263
264 void io_schedule(void);
265 long io_schedule_timeout(long timeout);
266
267 extern void cpu_init (void);
268 extern void trap_init(void);
269 extern void update_process_times(int user);
270 extern void scheduler_tick(void);
271
272 extern void sched_show_task(struct task_struct *p);
273
274 #ifdef CONFIG_LOCKUP_DETECTOR
275 extern void touch_softlockup_watchdog(void);
276 extern void touch_softlockup_watchdog_sync(void);
277 extern void touch_all_softlockup_watchdogs(void);
278 extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
279 void __user *buffer,
280 size_t *lenp, loff_t *ppos);
281 extern unsigned int softlockup_panic;
282 void lockup_detector_init(void);
283 #else
284 static inline void touch_softlockup_watchdog(void)
285 {
286 }
287 static inline void touch_softlockup_watchdog_sync(void)
288 {
289 }
290 static inline void touch_all_softlockup_watchdogs(void)
291 {
292 }
293 static inline void lockup_detector_init(void)
294 {
295 }
296 #endif
297
298 /* Attach to any functions which should be ignored in wchan output. */
299 #define __sched __attribute__((__section__(".sched.text")))
300
301 /* Linker adds these: start and end of __sched functions */
302 extern char __sched_text_start[], __sched_text_end[];
303
304 /* Is this address in the __sched functions? */
305 extern int in_sched_functions(unsigned long addr);
306
307 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
308 extern signed long schedule_timeout(signed long timeout);
309 extern signed long schedule_timeout_interruptible(signed long timeout);
310 extern signed long schedule_timeout_killable(signed long timeout);
311 extern signed long schedule_timeout_uninterruptible(signed long timeout);
312 asmlinkage void schedule(void);
313 extern void schedule_preempt_disabled(void);
314
315 struct nsproxy;
316 struct user_namespace;
317
318 #ifdef CONFIG_MMU
319 extern void arch_pick_mmap_layout(struct mm_struct *mm);
320 extern unsigned long
321 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
322 unsigned long, unsigned long);
323 extern unsigned long
324 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
325 unsigned long len, unsigned long pgoff,
326 unsigned long flags);
327 extern void arch_unmap_area(struct mm_struct *, unsigned long);
328 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
329 #else
330 static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
331 #endif
332
333
334 extern void set_dumpable(struct mm_struct *mm, int value);
335 extern int get_dumpable(struct mm_struct *mm);
336
337 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
338 #define SUID_DUMP_USER 1 /* Dump as user of process */
339 #define SUID_DUMP_ROOT 2 /* Dump as root */
340
341 /* mm flags */
342 /* dumpable bits */
343 #define MMF_DUMPABLE 0 /* core dump is permitted */
344 #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
345
346 #define MMF_DUMPABLE_BITS 2
347 #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
348
349 /* coredump filter bits */
350 #define MMF_DUMP_ANON_PRIVATE 2
351 #define MMF_DUMP_ANON_SHARED 3
352 #define MMF_DUMP_MAPPED_PRIVATE 4
353 #define MMF_DUMP_MAPPED_SHARED 5
354 #define MMF_DUMP_ELF_HEADERS 6
355 #define MMF_DUMP_HUGETLB_PRIVATE 7
356 #define MMF_DUMP_HUGETLB_SHARED 8
357
358 #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
359 #define MMF_DUMP_FILTER_BITS 7
360 #define MMF_DUMP_FILTER_MASK \
361 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
362 #define MMF_DUMP_FILTER_DEFAULT \
363 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
364 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
365
366 #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
367 # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
368 #else
369 # define MMF_DUMP_MASK_DEFAULT_ELF 0
370 #endif
371 /* leave room for more dump flags */
372 #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
373 #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
374 #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
375
376 #define MMF_HAS_UPROBES 19 /* has uprobes */
377 #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */
378
379 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
380
381 struct sighand_struct {
382 atomic_t count;
383 struct k_sigaction action[_NSIG];
384 spinlock_t siglock;
385 wait_queue_head_t signalfd_wqh;
386 };
387
388 struct pacct_struct {
389 int ac_flag;
390 long ac_exitcode;
391 unsigned long ac_mem;
392 cputime_t ac_utime, ac_stime;
393 unsigned long ac_minflt, ac_majflt;
394 };
395
396 struct cpu_itimer {
397 cputime_t expires;
398 cputime_t incr;
399 u32 error;
400 u32 incr_error;
401 };
402
403 /**
404 * struct cputime - snaphsot of system and user cputime
405 * @utime: time spent in user mode
406 * @stime: time spent in system mode
407 *
408 * Gathers a generic snapshot of user and system time.
409 */
410 struct cputime {
411 cputime_t utime;
412 cputime_t stime;
413 };
414
415 /**
416 * struct task_cputime - collected CPU time counts
417 * @utime: time spent in user mode, in &cputime_t units
418 * @stime: time spent in kernel mode, in &cputime_t units
419 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
420 *
421 * This is an extension of struct cputime that includes the total runtime
422 * spent by the task from the scheduler point of view.
423 *
424 * As a result, this structure groups together three kinds of CPU time
425 * that are tracked for threads and thread groups. Most things considering
426 * CPU time want to group these counts together and treat all three
427 * of them in parallel.
428 */
429 struct task_cputime {
430 cputime_t utime;
431 cputime_t stime;
432 unsigned long long sum_exec_runtime;
433 };
434 /* Alternate field names when used to cache expirations. */
435 #define prof_exp stime
436 #define virt_exp utime
437 #define sched_exp sum_exec_runtime
438
439 #define INIT_CPUTIME \
440 (struct task_cputime) { \
441 .utime = 0, \
442 .stime = 0, \
443 .sum_exec_runtime = 0, \
444 }
445
446 /*
447 * Disable preemption until the scheduler is running.
448 * Reset by start_kernel()->sched_init()->init_idle().
449 *
450 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
451 * before the scheduler is active -- see should_resched().
452 */
453 #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
454
455 /**
456 * struct thread_group_cputimer - thread group interval timer counts
457 * @cputime: thread group interval timers.
458 * @running: non-zero when there are timers running and
459 * @cputime receives updates.
460 * @lock: lock for fields in this struct.
461 *
462 * This structure contains the version of task_cputime, above, that is
463 * used for thread group CPU timer calculations.
464 */
465 struct thread_group_cputimer {
466 struct task_cputime cputime;
467 int running;
468 raw_spinlock_t lock;
469 };
470
471 #include <linux/rwsem.h>
472 struct autogroup;
473
474 /*
475 * NOTE! "signal_struct" does not have its own
476 * locking, because a shared signal_struct always
477 * implies a shared sighand_struct, so locking
478 * sighand_struct is always a proper superset of
479 * the locking of signal_struct.
480 */
481 struct signal_struct {
482 atomic_t sigcnt;
483 atomic_t live;
484 int nr_threads;
485 struct list_head thread_head;
486
487 wait_queue_head_t wait_chldexit; /* for wait4() */
488
489 /* current thread group signal load-balancing target: */
490 struct task_struct *curr_target;
491
492 /* shared signal handling: */
493 struct sigpending shared_pending;
494
495 /* thread group exit support */
496 int group_exit_code;
497 /* overloaded:
498 * - notify group_exit_task when ->count is equal to notify_count
499 * - everyone except group_exit_task is stopped during signal delivery
500 * of fatal signals, group_exit_task processes the signal.
501 */
502 int notify_count;
503 struct task_struct *group_exit_task;
504
505 /* thread group stop support, overloads group_exit_code too */
506 int group_stop_count;
507 unsigned int flags; /* see SIGNAL_* flags below */
508
509 /*
510 * PR_SET_CHILD_SUBREAPER marks a process, like a service
511 * manager, to re-parent orphan (double-forking) child processes
512 * to this process instead of 'init'. The service manager is
513 * able to receive SIGCHLD signals and is able to investigate
514 * the process until it calls wait(). All children of this
515 * process will inherit a flag if they should look for a
516 * child_subreaper process at exit.
517 */
518 unsigned int is_child_subreaper:1;
519 unsigned int has_child_subreaper:1;
520
521 /* POSIX.1b Interval Timers */
522 int posix_timer_id;
523 struct list_head posix_timers;
524
525 /* ITIMER_REAL timer for the process */
526 struct hrtimer real_timer;
527 struct pid *leader_pid;
528 ktime_t it_real_incr;
529
530 /*
531 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
532 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
533 * values are defined to 0 and 1 respectively
534 */
535 struct cpu_itimer it[2];
536
537 /*
538 * Thread group totals for process CPU timers.
539 * See thread_group_cputimer(), et al, for details.
540 */
541 struct thread_group_cputimer cputimer;
542
543 /* Earliest-expiration cache. */
544 struct task_cputime cputime_expires;
545
546 struct list_head cpu_timers[3];
547
548 struct pid *tty_old_pgrp;
549
550 /* boolean value for session group leader */
551 int leader;
552
553 struct tty_struct *tty; /* NULL if no tty */
554
555 #ifdef CONFIG_SCHED_AUTOGROUP
556 struct autogroup *autogroup;
557 #endif
558 /*
559 * Cumulative resource counters for dead threads in the group,
560 * and for reaped dead child processes forked by this group.
561 * Live threads maintain their own counters and add to these
562 * in __exit_signal, except for the group leader.
563 */
564 cputime_t utime, stime, cutime, cstime;
565 cputime_t gtime;
566 cputime_t cgtime;
567 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
568 struct cputime prev_cputime;
569 #endif
570 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
571 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
572 unsigned long inblock, oublock, cinblock, coublock;
573 unsigned long maxrss, cmaxrss;
574 struct task_io_accounting ioac;
575
576 /*
577 * Cumulative ns of schedule CPU time fo dead threads in the
578 * group, not including a zombie group leader, (This only differs
579 * from jiffies_to_ns(utime + stime) if sched_clock uses something
580 * other than jiffies.)
581 */
582 unsigned long long sum_sched_runtime;
583
584 /*
585 * We don't bother to synchronize most readers of this at all,
586 * because there is no reader checking a limit that actually needs
587 * to get both rlim_cur and rlim_max atomically, and either one
588 * alone is a single word that can safely be read normally.
589 * getrlimit/setrlimit use task_lock(current->group_leader) to
590 * protect this instead of the siglock, because they really
591 * have no need to disable irqs.
592 */
593 struct rlimit rlim[RLIM_NLIMITS];
594
595 #ifdef CONFIG_BSD_PROCESS_ACCT
596 struct pacct_struct pacct; /* per-process accounting information */
597 #endif
598 #ifdef CONFIG_TASKSTATS
599 struct taskstats *stats;
600 #endif
601 #ifdef CONFIG_AUDIT
602 unsigned audit_tty;
603 unsigned audit_tty_log_passwd;
604 struct tty_audit_buf *tty_audit_buf;
605 #endif
606 #ifdef CONFIG_CGROUPS
607 /*
608 * group_rwsem prevents new tasks from entering the threadgroup and
609 * member tasks from exiting,a more specifically, setting of
610 * PF_EXITING. fork and exit paths are protected with this rwsem
611 * using threadgroup_change_begin/end(). Users which require
612 * threadgroup to remain stable should use threadgroup_[un]lock()
613 * which also takes care of exec path. Currently, cgroup is the
614 * only user.
615 */
616 struct rw_semaphore group_rwsem;
617 #endif
618
619 oom_flags_t oom_flags;
620 short oom_score_adj; /* OOM kill score adjustment */
621 short oom_score_adj_min; /* OOM kill score adjustment min value.
622 * Only settable by CAP_SYS_RESOURCE. */
623
624 struct mutex cred_guard_mutex; /* guard against foreign influences on
625 * credential calculations
626 * (notably. ptrace) */
627 };
628
629 /*
630 * Bits in flags field of signal_struct.
631 */
632 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
633 #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
634 #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
635 #define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
636 /*
637 * Pending notifications to parent.
638 */
639 #define SIGNAL_CLD_STOPPED 0x00000010
640 #define SIGNAL_CLD_CONTINUED 0x00000020
641 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
642
643 #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
644
645 /* If true, all threads except ->group_exit_task have pending SIGKILL */
646 static inline int signal_group_exit(const struct signal_struct *sig)
647 {
648 return (sig->flags & SIGNAL_GROUP_EXIT) ||
649 (sig->group_exit_task != NULL);
650 }
651
652 /*
653 * Some day this will be a full-fledged user tracking system..
654 */
655 struct user_struct {
656 atomic_t __count; /* reference count */
657 atomic_t processes; /* How many processes does this user have? */
658 atomic_t files; /* How many open files does this user have? */
659 atomic_t sigpending; /* How many pending signals does this user have? */
660 #ifdef CONFIG_INOTIFY_USER
661 atomic_t inotify_watches; /* How many inotify watches does this user have? */
662 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
663 #endif
664 #ifdef CONFIG_FANOTIFY
665 atomic_t fanotify_listeners;
666 #endif
667 #ifdef CONFIG_EPOLL
668 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
669 #endif
670 #ifdef CONFIG_POSIX_MQUEUE
671 /* protected by mq_lock */
672 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
673 #endif
674 unsigned long locked_shm; /* How many pages of mlocked shm ? */
675 unsigned long unix_inflight; /* How many files in flight in unix sockets */
676 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
677
678 #ifdef CONFIG_KEYS
679 struct key *uid_keyring; /* UID specific keyring */
680 struct key *session_keyring; /* UID's default session keyring */
681 #endif
682
683 /* Hash table maintenance information */
684 struct hlist_node uidhash_node;
685 kuid_t uid;
686
687 #ifdef CONFIG_PERF_EVENTS
688 atomic_long_t locked_vm;
689 #endif
690 };
691
692 extern int uids_sysfs_init(void);
693
694 extern struct user_struct *find_user(kuid_t);
695
696 extern struct user_struct root_user;
697 #define INIT_USER (&root_user)
698
699
700 struct backing_dev_info;
701 struct reclaim_state;
702
703 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
704 struct sched_info {
705 /* cumulative counters */
706 unsigned long pcount; /* # of times run on this cpu */
707 unsigned long long run_delay; /* time spent waiting on a runqueue */
708
709 /* timestamps */
710 unsigned long long last_arrival,/* when we last ran on a cpu */
711 last_queued; /* when we were last queued to run */
712 };
713 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
714
715 #ifdef CONFIG_TASK_DELAY_ACCT
716 struct task_delay_info {
717 spinlock_t lock;
718 unsigned int flags; /* Private per-task flags */
719
720 /* For each stat XXX, add following, aligned appropriately
721 *
722 * struct timespec XXX_start, XXX_end;
723 * u64 XXX_delay;
724 * u32 XXX_count;
725 *
726 * Atomicity of updates to XXX_delay, XXX_count protected by
727 * single lock above (split into XXX_lock if contention is an issue).
728 */
729
730 /*
731 * XXX_count is incremented on every XXX operation, the delay
732 * associated with the operation is added to XXX_delay.
733 * XXX_delay contains the accumulated delay time in nanoseconds.
734 */
735 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
736 u64 blkio_delay; /* wait for sync block io completion */
737 u64 swapin_delay; /* wait for swapin block io completion */
738 u32 blkio_count; /* total count of the number of sync block */
739 /* io operations performed */
740 u32 swapin_count; /* total count of the number of swapin block */
741 /* io operations performed */
742
743 struct timespec freepages_start, freepages_end;
744 u64 freepages_delay; /* wait for memory reclaim */
745 u32 freepages_count; /* total count of memory reclaim */
746 };
747 #endif /* CONFIG_TASK_DELAY_ACCT */
748
749 static inline int sched_info_on(void)
750 {
751 #ifdef CONFIG_SCHEDSTATS
752 return 1;
753 #elif defined(CONFIG_TASK_DELAY_ACCT)
754 extern int delayacct_on;
755 return delayacct_on;
756 #else
757 return 0;
758 #endif
759 }
760
761 enum cpu_idle_type {
762 CPU_IDLE,
763 CPU_NOT_IDLE,
764 CPU_NEWLY_IDLE,
765 CPU_MAX_IDLE_TYPES
766 };
767
768 /*
769 * Increase resolution of cpu_power calculations
770 */
771 #define SCHED_POWER_SHIFT 10
772 #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
773
774 /*
775 * sched-domains (multiprocessor balancing) declarations:
776 */
777 #ifdef CONFIG_SMP
778 #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
779 #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
780 #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
781 #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
782 #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
783 #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
784 #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
785 #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
786 #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
787 #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
788 #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
789 #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
790
791 extern int __weak arch_sd_sibiling_asym_packing(void);
792
793 struct sched_domain_attr {
794 int relax_domain_level;
795 };
796
797 #define SD_ATTR_INIT (struct sched_domain_attr) { \
798 .relax_domain_level = -1, \
799 }
800
801 extern int sched_domain_level_max;
802
803 struct sched_group;
804
805 struct sched_domain {
806 /* These fields must be setup */
807 struct sched_domain *parent; /* top domain must be null terminated */
808 struct sched_domain *child; /* bottom domain must be null terminated */
809 struct sched_group *groups; /* the balancing groups of the domain */
810 unsigned long min_interval; /* Minimum balance interval ms */
811 unsigned long max_interval; /* Maximum balance interval ms */
812 unsigned int busy_factor; /* less balancing by factor if busy */
813 unsigned int imbalance_pct; /* No balance until over watermark */
814 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
815 unsigned int busy_idx;
816 unsigned int idle_idx;
817 unsigned int newidle_idx;
818 unsigned int wake_idx;
819 unsigned int forkexec_idx;
820 unsigned int smt_gain;
821
822 int nohz_idle; /* NOHZ IDLE status */
823 int flags; /* See SD_* */
824 int level;
825
826 /* Runtime fields. */
827 unsigned long last_balance; /* init to jiffies. units in jiffies */
828 unsigned int balance_interval; /* initialise to 1. units in ms. */
829 unsigned int nr_balance_failed; /* initialise to 0 */
830
831 u64 last_update;
832
833 #ifdef CONFIG_SCHEDSTATS
834 /* load_balance() stats */
835 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
836 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
837 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
838 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
839 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
840 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
841 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
842 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
843
844 /* Active load balancing */
845 unsigned int alb_count;
846 unsigned int alb_failed;
847 unsigned int alb_pushed;
848
849 /* SD_BALANCE_EXEC stats */
850 unsigned int sbe_count;
851 unsigned int sbe_balanced;
852 unsigned int sbe_pushed;
853
854 /* SD_BALANCE_FORK stats */
855 unsigned int sbf_count;
856 unsigned int sbf_balanced;
857 unsigned int sbf_pushed;
858
859 /* try_to_wake_up() stats */
860 unsigned int ttwu_wake_remote;
861 unsigned int ttwu_move_affine;
862 unsigned int ttwu_move_balance;
863 #endif
864 #ifdef CONFIG_SCHED_DEBUG
865 char *name;
866 #endif
867 union {
868 void *private; /* used during construction */
869 struct rcu_head rcu; /* used during destruction */
870 };
871
872 unsigned int span_weight;
873 /*
874 * Span of all CPUs in this domain.
875 *
876 * NOTE: this field is variable length. (Allocated dynamically
877 * by attaching extra space to the end of the structure,
878 * depending on how many CPUs the kernel has booted up with)
879 */
880 unsigned long span[0];
881 };
882
883 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
884 {
885 return to_cpumask(sd->span);
886 }
887
888 extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
889 struct sched_domain_attr *dattr_new);
890
891 /* Allocate an array of sched domains, for partition_sched_domains(). */
892 cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
893 void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
894
895 bool cpus_share_cache(int this_cpu, int that_cpu);
896
897 #else /* CONFIG_SMP */
898
899 struct sched_domain_attr;
900
901 static inline void
902 partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
903 struct sched_domain_attr *dattr_new)
904 {
905 }
906
907 static inline bool cpus_share_cache(int this_cpu, int that_cpu)
908 {
909 return true;
910 }
911
912 #endif /* !CONFIG_SMP */
913
914
915 struct io_context; /* See blkdev.h */
916
917
918 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
919 extern void prefetch_stack(struct task_struct *t);
920 #else
921 static inline void prefetch_stack(struct task_struct *t) { }
922 #endif
923
924 struct audit_context; /* See audit.c */
925 struct mempolicy;
926 struct pipe_inode_info;
927 struct uts_namespace;
928
929 struct load_weight {
930 unsigned long weight, inv_weight;
931 };
932
933 struct sched_avg {
934 /*
935 * These sums represent an infinite geometric series and so are bound
936 * above by 1024/(1-y). Thus we only need a u32 to store them for for all
937 * choices of y < 1-2^(-32)*1024.
938 */
939 u32 runnable_avg_sum, runnable_avg_period;
940 u64 last_runnable_update;
941 s64 decay_count;
942 unsigned long load_avg_contrib;
943 };
944
945 #ifdef CONFIG_SCHEDSTATS
946 struct sched_statistics {
947 u64 wait_start;
948 u64 wait_max;
949 u64 wait_count;
950 u64 wait_sum;
951 u64 iowait_count;
952 u64 iowait_sum;
953
954 u64 sleep_start;
955 u64 sleep_max;
956 s64 sum_sleep_runtime;
957
958 u64 block_start;
959 u64 block_max;
960 u64 exec_max;
961 u64 slice_max;
962
963 u64 nr_migrations_cold;
964 u64 nr_failed_migrations_affine;
965 u64 nr_failed_migrations_running;
966 u64 nr_failed_migrations_hot;
967 u64 nr_forced_migrations;
968
969 u64 nr_wakeups;
970 u64 nr_wakeups_sync;
971 u64 nr_wakeups_migrate;
972 u64 nr_wakeups_local;
973 u64 nr_wakeups_remote;
974 u64 nr_wakeups_affine;
975 u64 nr_wakeups_affine_attempts;
976 u64 nr_wakeups_passive;
977 u64 nr_wakeups_idle;
978 };
979 #endif
980
981 struct sched_entity {
982 struct load_weight load; /* for load-balancing */
983 struct rb_node run_node;
984 struct list_head group_node;
985 unsigned int on_rq;
986
987 u64 exec_start;
988 u64 sum_exec_runtime;
989 u64 vruntime;
990 u64 prev_sum_exec_runtime;
991
992 u64 nr_migrations;
993
994 #ifdef CONFIG_SCHEDSTATS
995 struct sched_statistics statistics;
996 #endif
997
998 #ifdef CONFIG_FAIR_GROUP_SCHED
999 struct sched_entity *parent;
1000 /* rq on which this entity is (to be) queued: */
1001 struct cfs_rq *cfs_rq;
1002 /* rq "owned" by this entity/group: */
1003 struct cfs_rq *my_q;
1004 #endif
1005
1006 /*
1007 * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
1008 * removed when useful for applications beyond shares distribution (e.g.
1009 * load-balance).
1010 */
1011 #if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
1012 /* Per-entity load-tracking */
1013 struct sched_avg avg;
1014 #endif
1015 };
1016
1017 struct sched_rt_entity {
1018 struct list_head run_list;
1019 unsigned long timeout;
1020 unsigned long watchdog_stamp;
1021 unsigned int time_slice;
1022
1023 struct sched_rt_entity *back;
1024 #ifdef CONFIG_RT_GROUP_SCHED
1025 struct sched_rt_entity *parent;
1026 /* rq on which this entity is (to be) queued: */
1027 struct rt_rq *rt_rq;
1028 /* rq "owned" by this entity/group: */
1029 struct rt_rq *my_q;
1030 #endif
1031 };
1032
1033
1034 struct rcu_node;
1035
1036 enum perf_event_task_context {
1037 perf_invalid_context = -1,
1038 perf_hw_context = 0,
1039 perf_sw_context,
1040 perf_nr_task_contexts,
1041 };
1042
1043 struct task_struct {
1044 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
1045 void *stack;
1046 atomic_t usage;
1047 unsigned int flags; /* per process flags, defined below */
1048 unsigned int ptrace;
1049
1050 #ifdef CONFIG_SMP
1051 struct llist_node wake_entry;
1052 int on_cpu;
1053 #endif
1054 int on_rq;
1055
1056 int prio, static_prio, normal_prio;
1057 unsigned int rt_priority;
1058 const struct sched_class *sched_class;
1059 struct sched_entity se;
1060 struct sched_rt_entity rt;
1061 #ifdef CONFIG_CGROUP_SCHED
1062 struct task_group *sched_task_group;
1063 #endif
1064
1065 #ifdef CONFIG_PREEMPT_NOTIFIERS
1066 /* list of struct preempt_notifier: */
1067 struct hlist_head preempt_notifiers;
1068 #endif
1069
1070 /*
1071 * fpu_counter contains the number of consecutive context switches
1072 * that the FPU is used. If this is over a threshold, the lazy fpu
1073 * saving becomes unlazy to save the trap. This is an unsigned char
1074 * so that after 256 times the counter wraps and the behavior turns
1075 * lazy again; this to deal with bursty apps that only use FPU for
1076 * a short time
1077 */
1078 unsigned char fpu_counter;
1079 #ifdef CONFIG_BLK_DEV_IO_TRACE
1080 unsigned int btrace_seq;
1081 #endif
1082
1083 unsigned int policy;
1084 int nr_cpus_allowed;
1085 cpumask_t cpus_allowed;
1086
1087 #ifdef CONFIG_PREEMPT_RCU
1088 int rcu_read_lock_nesting;
1089 char rcu_read_unlock_special;
1090 struct list_head rcu_node_entry;
1091 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1092 #ifdef CONFIG_TREE_PREEMPT_RCU
1093 struct rcu_node *rcu_blocked_node;
1094 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1095 #ifdef CONFIG_RCU_BOOST
1096 struct rt_mutex *rcu_boost_mutex;
1097 #endif /* #ifdef CONFIG_RCU_BOOST */
1098
1099 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1100 struct sched_info sched_info;
1101 #endif
1102
1103 struct list_head tasks;
1104 #ifdef CONFIG_SMP
1105 struct plist_node pushable_tasks;
1106 #endif
1107
1108 struct mm_struct *mm, *active_mm;
1109 #ifdef CONFIG_COMPAT_BRK
1110 unsigned brk_randomized:1;
1111 #endif
1112 #if defined(SPLIT_RSS_COUNTING)
1113 struct task_rss_stat rss_stat;
1114 #endif
1115 /* task state */
1116 int exit_state;
1117 int exit_code, exit_signal;
1118 int pdeath_signal; /* The signal sent when the parent dies */
1119 unsigned int jobctl; /* JOBCTL_*, siglock protected */
1120
1121 /* Used for emulating ABI behavior of previous Linux versions */
1122 unsigned int personality;
1123
1124 unsigned did_exec:1;
1125 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1126 * execve */
1127 unsigned in_iowait:1;
1128
1129 /* task may not gain privileges */
1130 unsigned no_new_privs:1;
1131
1132 /* Revert to default priority/policy when forking */
1133 unsigned sched_reset_on_fork:1;
1134 unsigned sched_contributes_to_load:1;
1135
1136 pid_t pid;
1137 pid_t tgid;
1138
1139 #ifdef CONFIG_CC_STACKPROTECTOR
1140 /* Canary value for the -fstack-protector gcc feature */
1141 unsigned long stack_canary;
1142 #endif
1143 /*
1144 * pointers to (original) parent process, youngest child, younger sibling,
1145 * older sibling, respectively. (p->father can be replaced with
1146 * p->real_parent->pid)
1147 */
1148 struct task_struct __rcu *real_parent; /* real parent process */
1149 struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
1150 /*
1151 * children/sibling forms the list of my natural children
1152 */
1153 struct list_head children; /* list of my children */
1154 struct list_head sibling; /* linkage in my parent's children list */
1155 struct task_struct *group_leader; /* threadgroup leader */
1156
1157 /*
1158 * ptraced is the list of tasks this task is using ptrace on.
1159 * This includes both natural children and PTRACE_ATTACH targets.
1160 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1161 */
1162 struct list_head ptraced;
1163 struct list_head ptrace_entry;
1164
1165 /* PID/PID hash table linkage. */
1166 struct pid_link pids[PIDTYPE_MAX];
1167 struct list_head thread_group;
1168 struct list_head thread_node;
1169
1170 struct completion *vfork_done; /* for vfork() */
1171 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1172 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1173
1174 cputime_t utime, stime, utimescaled, stimescaled;
1175 cputime_t gtime;
1176 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1177 struct cputime prev_cputime;
1178 #endif
1179 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1180 seqlock_t vtime_seqlock;
1181 unsigned long long vtime_snap;
1182 enum {
1183 VTIME_SLEEPING = 0,
1184 VTIME_USER,
1185 VTIME_SYS,
1186 } vtime_snap_whence;
1187 #endif
1188 unsigned long nvcsw, nivcsw; /* context switch counts */
1189 struct timespec start_time; /* monotonic time */
1190 struct timespec real_start_time; /* boot based time */
1191 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1192 unsigned long min_flt, maj_flt;
1193
1194 struct task_cputime cputime_expires;
1195 struct list_head cpu_timers[3];
1196
1197 /* process credentials */
1198 const struct cred __rcu *real_cred; /* objective and real subjective task
1199 * credentials (COW) */
1200 const struct cred __rcu *cred; /* effective (overridable) subjective task
1201 * credentials (COW) */
1202 char comm[TASK_COMM_LEN]; /* executable name excluding path
1203 - access with [gs]et_task_comm (which lock
1204 it with task_lock())
1205 - initialized normally by setup_new_exec */
1206 /* file system info */
1207 int link_count, total_link_count;
1208 #ifdef CONFIG_SYSVIPC
1209 /* ipc stuff */
1210 struct sysv_sem sysvsem;
1211 #endif
1212 #ifdef CONFIG_DETECT_HUNG_TASK
1213 /* hung task detection */
1214 unsigned long last_switch_count;
1215 #endif
1216 /* CPU-specific state of this task */
1217 struct thread_struct thread;
1218 /* filesystem information */
1219 struct fs_struct *fs;
1220 /* open file information */
1221 struct files_struct *files;
1222 /* namespaces */
1223 struct nsproxy *nsproxy;
1224 /* signal handlers */
1225 struct signal_struct *signal;
1226 struct sighand_struct *sighand;
1227
1228 sigset_t blocked, real_blocked;
1229 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1230 struct sigpending pending;
1231
1232 unsigned long sas_ss_sp;
1233 size_t sas_ss_size;
1234 int (*notifier)(void *priv);
1235 void *notifier_data;
1236 sigset_t *notifier_mask;
1237 struct callback_head *task_works;
1238
1239 struct audit_context *audit_context;
1240 #ifdef CONFIG_AUDITSYSCALL
1241 kuid_t loginuid;
1242 unsigned int sessionid;
1243 #endif
1244 struct seccomp seccomp;
1245
1246 /* Thread group tracking */
1247 u32 parent_exec_id;
1248 u32 self_exec_id;
1249 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1250 * mempolicy */
1251 spinlock_t alloc_lock;
1252
1253 /* Protection of the PI data structures: */
1254 raw_spinlock_t pi_lock;
1255
1256 #ifdef CONFIG_RT_MUTEXES
1257 /* PI waiters blocked on a rt_mutex held by this task */
1258 struct plist_head pi_waiters;
1259 /* Deadlock detection and priority inheritance handling */
1260 struct rt_mutex_waiter *pi_blocked_on;
1261 #endif
1262
1263 #ifdef CONFIG_DEBUG_MUTEXES
1264 /* mutex deadlock detection */
1265 struct mutex_waiter *blocked_on;
1266 #endif
1267 #ifdef CONFIG_TRACE_IRQFLAGS
1268 unsigned int irq_events;
1269 unsigned long hardirq_enable_ip;
1270 unsigned long hardirq_disable_ip;
1271 unsigned int hardirq_enable_event;
1272 unsigned int hardirq_disable_event;
1273 int hardirqs_enabled;
1274 int hardirq_context;
1275 unsigned long softirq_disable_ip;
1276 unsigned long softirq_enable_ip;
1277 unsigned int softirq_disable_event;
1278 unsigned int softirq_enable_event;
1279 int softirqs_enabled;
1280 int softirq_context;
1281 #endif
1282 #ifdef CONFIG_LOCKDEP
1283 # define MAX_LOCK_DEPTH 48UL
1284 u64 curr_chain_key;
1285 int lockdep_depth;
1286 unsigned int lockdep_recursion;
1287 struct held_lock held_locks[MAX_LOCK_DEPTH];
1288 gfp_t lockdep_reclaim_gfp;
1289 #endif
1290
1291 /* journalling filesystem info */
1292 void *journal_info;
1293
1294 /* stacked block device info */
1295 struct bio_list *bio_list;
1296
1297 #ifdef CONFIG_BLOCK
1298 /* stack plugging */
1299 struct blk_plug *plug;
1300 #endif
1301
1302 /* VM state */
1303 struct reclaim_state *reclaim_state;
1304
1305 struct backing_dev_info *backing_dev_info;
1306
1307 struct io_context *io_context;
1308
1309 unsigned long ptrace_message;
1310 siginfo_t *last_siginfo; /* For ptrace use. */
1311 struct task_io_accounting ioac;
1312 #if defined(CONFIG_TASK_XACCT)
1313 u64 acct_rss_mem1; /* accumulated rss usage */
1314 u64 acct_vm_mem1; /* accumulated virtual memory usage */
1315 cputime_t acct_timexpd; /* stime + utime since last update */
1316 #endif
1317 #ifdef CONFIG_CPUSETS
1318 nodemask_t mems_allowed; /* Protected by alloc_lock */
1319 seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
1320 int cpuset_mem_spread_rotor;
1321 int cpuset_slab_spread_rotor;
1322 #endif
1323 #ifdef CONFIG_CGROUPS
1324 /* Control Group info protected by css_set_lock */
1325 struct css_set __rcu *cgroups;
1326 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1327 struct list_head cg_list;
1328 #endif
1329 #ifdef CONFIG_FUTEX
1330 struct robust_list_head __user *robust_list;
1331 #ifdef CONFIG_COMPAT
1332 struct compat_robust_list_head __user *compat_robust_list;
1333 #endif
1334 struct list_head pi_state_list;
1335 struct futex_pi_state *pi_state_cache;
1336 #endif
1337 #ifdef CONFIG_PERF_EVENTS
1338 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1339 struct mutex perf_event_mutex;
1340 struct list_head perf_event_list;
1341 #endif
1342 #ifdef CONFIG_NUMA
1343 struct mempolicy *mempolicy; /* Protected by alloc_lock */
1344 short il_next;
1345 short pref_node_fork;
1346 #endif
1347 #ifdef CONFIG_NUMA_BALANCING
1348 int numa_scan_seq;
1349 int numa_migrate_seq;
1350 unsigned int numa_scan_period;
1351 u64 node_stamp; /* migration stamp */
1352 struct callback_head numa_work;
1353 #endif /* CONFIG_NUMA_BALANCING */
1354
1355 struct rcu_head rcu;
1356
1357 /*
1358 * cache last used pipe for splice
1359 */
1360 struct pipe_inode_info *splice_pipe;
1361
1362 struct page_frag task_frag;
1363
1364 #ifdef CONFIG_TASK_DELAY_ACCT
1365 struct task_delay_info *delays;
1366 #endif
1367 #ifdef CONFIG_FAULT_INJECTION
1368 int make_it_fail;
1369 #endif
1370 /*
1371 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
1372 * balance_dirty_pages() for some dirty throttling pause
1373 */
1374 int nr_dirtied;
1375 int nr_dirtied_pause;
1376 unsigned long dirty_paused_when; /* start of a write-and-pause period */
1377
1378 #ifdef CONFIG_LATENCYTOP
1379 int latency_record_count;
1380 struct latency_record latency_record[LT_SAVECOUNT];
1381 #endif
1382 /*
1383 * time slack values; these are used to round up poll() and
1384 * select() etc timeout values. These are in nanoseconds.
1385 */
1386 unsigned long timer_slack_ns;
1387 unsigned long default_timer_slack_ns;
1388
1389 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1390 /* Index of current stored address in ret_stack */
1391 int curr_ret_stack;
1392 /* Stack of return addresses for return function tracing */
1393 struct ftrace_ret_stack *ret_stack;
1394 /* time stamp for last schedule */
1395 unsigned long long ftrace_timestamp;
1396 /*
1397 * Number of functions that haven't been traced
1398 * because of depth overrun.
1399 */
1400 atomic_t trace_overrun;
1401 /* Pause for the tracing */
1402 atomic_t tracing_graph_pause;
1403 #endif
1404 #ifdef CONFIG_TRACING
1405 /* state flags for use by tracers */
1406 unsigned long trace;
1407 /* bitmask and counter of trace recursion */
1408 unsigned long trace_recursion;
1409 #endif /* CONFIG_TRACING */
1410 #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
1411 struct memcg_batch_info {
1412 int do_batch; /* incremented when batch uncharge started */
1413 struct mem_cgroup *memcg; /* target memcg of uncharge */
1414 unsigned long nr_pages; /* uncharged usage */
1415 unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1416 } memcg_batch;
1417 unsigned int memcg_kmem_skip_account;
1418 struct memcg_oom_info {
1419 struct mem_cgroup *memcg;
1420 gfp_t gfp_mask;
1421 int order;
1422 unsigned int may_oom:1;
1423 } memcg_oom;
1424 #endif
1425 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1426 atomic_t ptrace_bp_refcnt;
1427 #endif
1428 #ifdef CONFIG_UPROBES
1429 struct uprobe_task *utask;
1430 #endif
1431 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
1432 unsigned int sequential_io;
1433 unsigned int sequential_io_avg;
1434 #endif
1435 #if defined(CONFIG_CCSECURITY) && !defined(CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY)
1436 struct ccs_domain_info *ccs_domain_info;
1437 u32 ccs_flags;
1438 #endif
1439 };
1440
1441 /* Future-safe accessor for struct task_struct's cpus_allowed. */
1442 #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1443
1444 #ifdef CONFIG_NUMA_BALANCING
1445 extern void task_numa_fault(int node, int pages, bool migrated);
1446 extern void set_numabalancing_state(bool enabled);
1447 #else
1448 static inline void task_numa_fault(int node, int pages, bool migrated)
1449 {
1450 }
1451 static inline void set_numabalancing_state(bool enabled)
1452 {
1453 }
1454 #endif
1455
1456 static inline struct pid *task_pid(struct task_struct *task)
1457 {
1458 return task->pids[PIDTYPE_PID].pid;
1459 }
1460
1461 static inline struct pid *task_tgid(struct task_struct *task)
1462 {
1463 return task->group_leader->pids[PIDTYPE_PID].pid;
1464 }
1465
1466 /*
1467 * Without tasklist or rcu lock it is not safe to dereference
1468 * the result of task_pgrp/task_session even if task == current,
1469 * we can race with another thread doing sys_setsid/sys_setpgid.
1470 */
1471 static inline struct pid *task_pgrp(struct task_struct *task)
1472 {
1473 return task->group_leader->pids[PIDTYPE_PGID].pid;
1474 }
1475
1476 static inline struct pid *task_session(struct task_struct *task)
1477 {
1478 return task->group_leader->pids[PIDTYPE_SID].pid;
1479 }
1480
1481 struct pid_namespace;
1482
1483 /*
1484 * the helpers to get the task's different pids as they are seen
1485 * from various namespaces
1486 *
1487 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
1488 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1489 * current.
1490 * task_xid_nr_ns() : id seen from the ns specified;
1491 *
1492 * set_task_vxid() : assigns a virtual id to a task;
1493 *
1494 * see also pid_nr() etc in include/linux/pid.h
1495 */
1496 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1497 struct pid_namespace *ns);
1498
1499 static inline pid_t task_pid_nr(struct task_struct *tsk)
1500 {
1501 return tsk->pid;
1502 }
1503
1504 static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1505 struct pid_namespace *ns)
1506 {
1507 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1508 }
1509
1510 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1511 {
1512 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1513 }
1514
1515
1516 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1517 {
1518 return tsk->tgid;
1519 }
1520
1521 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1522
1523 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1524 {
1525 return pid_vnr(task_tgid(tsk));
1526 }
1527
1528
1529 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1530 struct pid_namespace *ns)
1531 {
1532 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1533 }
1534
1535 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1536 {
1537 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1538 }
1539
1540
1541 static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1542 struct pid_namespace *ns)
1543 {
1544 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1545 }
1546
1547 static inline pid_t task_session_vnr(struct task_struct *tsk)
1548 {
1549 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1550 }
1551
1552 /* obsolete, do not use */
1553 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1554 {
1555 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1556 }
1557
1558 /**
1559 * pid_alive - check that a task structure is not stale
1560 * @p: Task structure to be checked.
1561 *
1562 * Test if a process is not yet dead (at most zombie state)
1563 * If pid_alive fails, then pointers within the task structure
1564 * can be stale and must not be dereferenced.
1565 */
1566 static inline int pid_alive(struct task_struct *p)
1567 {
1568 return p->pids[PIDTYPE_PID].pid != NULL;
1569 }
1570
1571 /**
1572 * is_global_init - check if a task structure is init
1573 * @tsk: Task structure to be checked.
1574 *
1575 * Check if a task structure is the first user space task the kernel created.
1576 */
1577 static inline int is_global_init(struct task_struct *tsk)
1578 {
1579 return tsk->pid == 1;
1580 }
1581
1582 extern struct pid *cad_pid;
1583
1584 extern void free_task(struct task_struct *tsk);
1585 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1586
1587 extern void __put_task_struct(struct task_struct *t);
1588
1589 static inline void put_task_struct(struct task_struct *t)
1590 {
1591 if (atomic_dec_and_test(&t->usage))
1592 __put_task_struct(t);
1593 }
1594
1595 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1596 extern void task_cputime(struct task_struct *t,
1597 cputime_t *utime, cputime_t *stime);
1598 extern void task_cputime_scaled(struct task_struct *t,
1599 cputime_t *utimescaled, cputime_t *stimescaled);
1600 extern cputime_t task_gtime(struct task_struct *t);
1601 #else
1602 static inline void task_cputime(struct task_struct *t,
1603 cputime_t *utime, cputime_t *stime)
1604 {
1605 if (utime)
1606 *utime = t->utime;
1607 if (stime)
1608 *stime = t->stime;
1609 }
1610
1611 static inline void task_cputime_scaled(struct task_struct *t,
1612 cputime_t *utimescaled,
1613 cputime_t *stimescaled)
1614 {
1615 if (utimescaled)
1616 *utimescaled = t->utimescaled;
1617 if (stimescaled)
1618 *stimescaled = t->stimescaled;
1619 }
1620
1621 static inline cputime_t task_gtime(struct task_struct *t)
1622 {
1623 return t->gtime;
1624 }
1625 #endif
1626 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1627 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
1628
1629 /*
1630 * Per process flags
1631 */
1632 #define PF_EXITING 0x00000004 /* getting shut down */
1633 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1634 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1635 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
1636 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1637 #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1638 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1639 #define PF_DUMPCORE 0x00000200 /* dumped core */
1640 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1641 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1642 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
1643 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1644 #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */
1645 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1646 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1647 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1648 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1649 #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
1650 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1651 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */
1652 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1653 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1654 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1655 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1656 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */
1657 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
1658 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1659 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1660 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
1661
1662 /*
1663 * Only the _current_ task can read/write to tsk->flags, but other
1664 * tasks can access tsk->flags in readonly mode for example
1665 * with tsk_used_math (like during threaded core dumping).
1666 * There is however an exception to this rule during ptrace
1667 * or during fork: the ptracer task is allowed to write to the
1668 * child->flags of its traced child (same goes for fork, the parent
1669 * can write to the child->flags), because we're guaranteed the
1670 * child is not running and in turn not changing child->flags
1671 * at the same time the parent does it.
1672 */
1673 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1674 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1675 #define clear_used_math() clear_stopped_child_used_math(current)
1676 #define set_used_math() set_stopped_child_used_math(current)
1677 #define conditional_stopped_child_used_math(condition, child) \
1678 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1679 #define conditional_used_math(condition) \
1680 conditional_stopped_child_used_math(condition, current)
1681 #define copy_to_stopped_child_used_math(child) \
1682 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1683 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1684 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1685 #define used_math() tsk_used_math(current)
1686
1687 /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
1688 * __GFP_FS is also cleared as it implies __GFP_IO.
1689 */
1690 static inline gfp_t memalloc_noio_flags(gfp_t flags)
1691 {
1692 if (unlikely(current->flags & PF_MEMALLOC_NOIO))
1693 flags &= ~(__GFP_IO | __GFP_FS);
1694 return flags;
1695 }
1696
1697 static inline unsigned int memalloc_noio_save(void)
1698 {
1699 unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
1700 current->flags |= PF_MEMALLOC_NOIO;
1701 return flags;
1702 }
1703
1704 static inline void memalloc_noio_restore(unsigned int flags)
1705 {
1706 current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
1707 }
1708
1709 /*
1710 * task->jobctl flags
1711 */
1712 #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
1713
1714 #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
1715 #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
1716 #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
1717 #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
1718 #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
1719 #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
1720 #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
1721
1722 #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
1723 #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
1724 #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
1725 #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
1726 #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
1727 #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
1728 #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
1729
1730 #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
1731 #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
1732
1733 extern bool task_set_jobctl_pending(struct task_struct *task,
1734 unsigned int mask);
1735 extern void task_clear_jobctl_trapping(struct task_struct *task);
1736 extern void task_clear_jobctl_pending(struct task_struct *task,
1737 unsigned int mask);
1738
1739 #ifdef CONFIG_PREEMPT_RCU
1740
1741 #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1742 #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1743
1744 static inline void rcu_copy_process(struct task_struct *p)
1745 {
1746 p->rcu_read_lock_nesting = 0;
1747 p->rcu_read_unlock_special = 0;
1748 #ifdef CONFIG_TREE_PREEMPT_RCU
1749 p->rcu_blocked_node = NULL;
1750 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1751 #ifdef CONFIG_RCU_BOOST
1752 p->rcu_boost_mutex = NULL;
1753 #endif /* #ifdef CONFIG_RCU_BOOST */
1754 INIT_LIST_HEAD(&p->rcu_node_entry);
1755 }
1756
1757 #else
1758
1759 static inline void rcu_copy_process(struct task_struct *p)
1760 {
1761 }
1762
1763 #endif
1764
1765 static inline void tsk_restore_flags(struct task_struct *task,
1766 unsigned long orig_flags, unsigned long flags)
1767 {
1768 task->flags &= ~flags;
1769 task->flags |= orig_flags & flags;
1770 }
1771
1772 #ifdef CONFIG_SMP
1773 extern void do_set_cpus_allowed(struct task_struct *p,
1774 const struct cpumask *new_mask);
1775
1776 extern int set_cpus_allowed_ptr(struct task_struct *p,
1777 const struct cpumask *new_mask);
1778 #else
1779 static inline void do_set_cpus_allowed(struct task_struct *p,
1780 const struct cpumask *new_mask)
1781 {
1782 }
1783 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1784 const struct cpumask *new_mask)
1785 {
1786 if (!cpumask_test_cpu(0, new_mask))
1787 return -EINVAL;
1788 return 0;
1789 }
1790 #endif
1791
1792 #ifdef CONFIG_NO_HZ_COMMON
1793 void calc_load_enter_idle(void);
1794 void calc_load_exit_idle(void);
1795 #else
1796 static inline void calc_load_enter_idle(void) { }
1797 static inline void calc_load_exit_idle(void) { }
1798 #endif /* CONFIG_NO_HZ_COMMON */
1799
1800 #ifndef CONFIG_CPUMASK_OFFSTACK
1801 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1802 {
1803 return set_cpus_allowed_ptr(p, &new_mask);
1804 }
1805 #endif
1806
1807 /*
1808 * Do not use outside of architecture code which knows its limitations.
1809 *
1810 * sched_clock() has no promise of monotonicity or bounded drift between
1811 * CPUs, use (which you should not) requires disabling IRQs.
1812 *
1813 * Please use one of the three interfaces below.
1814 */
1815 extern unsigned long long notrace sched_clock(void);
1816 /*
1817 * See the comment in kernel/sched/clock.c
1818 */
1819 extern u64 cpu_clock(int cpu);
1820 extern u64 local_clock(void);
1821 extern u64 sched_clock_cpu(int cpu);
1822
1823
1824 extern void sched_clock_init(void);
1825
1826 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1827 static inline void sched_clock_tick(void)
1828 {
1829 }
1830
1831 static inline void sched_clock_idle_sleep_event(void)
1832 {
1833 }
1834
1835 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1836 {
1837 }
1838 #else
1839 /*
1840 * Architectures can set this to 1 if they have specified
1841 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1842 * but then during bootup it turns out that sched_clock()
1843 * is reliable after all:
1844 */
1845 extern int sched_clock_stable;
1846
1847 extern void sched_clock_tick(void);
1848 extern void sched_clock_idle_sleep_event(void);
1849 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1850 #endif
1851
1852 #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1853 /*
1854 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1855 * The reason for this explicit opt-in is not to have perf penalty with
1856 * slow sched_clocks.
1857 */
1858 extern void enable_sched_clock_irqtime(void);
1859 extern void disable_sched_clock_irqtime(void);
1860 #else
1861 static inline void enable_sched_clock_irqtime(void) {}
1862 static inline void disable_sched_clock_irqtime(void) {}
1863 #endif
1864
1865 extern unsigned long long
1866 task_sched_runtime(struct task_struct *task);
1867
1868 /* sched_exec is called by processes performing an exec */
1869 #ifdef CONFIG_SMP
1870 extern void sched_exec(void);
1871 #else
1872 #define sched_exec() {}
1873 #endif
1874
1875 extern void sched_clock_idle_sleep_event(void);
1876 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1877
1878 #ifdef CONFIG_HOTPLUG_CPU
1879 extern void idle_task_exit(void);
1880 #else
1881 static inline void idle_task_exit(void) {}
1882 #endif
1883
1884 #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
1885 extern void wake_up_nohz_cpu(int cpu);
1886 #else
1887 static inline void wake_up_nohz_cpu(int cpu) { }
1888 #endif
1889
1890 #ifdef CONFIG_NO_HZ_FULL
1891 extern bool sched_can_stop_tick(void);
1892 extern u64 scheduler_tick_max_deferment(void);
1893 #else
1894 static inline bool sched_can_stop_tick(void) { return false; }
1895 #endif
1896
1897 #ifdef CONFIG_SCHED_AUTOGROUP
1898 extern void sched_autogroup_create_attach(struct task_struct *p);
1899 extern void sched_autogroup_detach(struct task_struct *p);
1900 extern void sched_autogroup_fork(struct signal_struct *sig);
1901 extern void sched_autogroup_exit(struct signal_struct *sig);
1902 #ifdef CONFIG_PROC_FS
1903 extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
1904 extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
1905 #endif
1906 #else
1907 static inline void sched_autogroup_create_attach(struct task_struct *p) { }
1908 static inline void sched_autogroup_detach(struct task_struct *p) { }
1909 static inline void sched_autogroup_fork(struct signal_struct *sig) { }
1910 static inline void sched_autogroup_exit(struct signal_struct *sig) { }
1911 #endif
1912
1913 extern bool yield_to(struct task_struct *p, bool preempt);
1914 extern void set_user_nice(struct task_struct *p, long nice);
1915 extern int task_prio(const struct task_struct *p);
1916 extern int task_nice(const struct task_struct *p);
1917 extern int can_nice(const struct task_struct *p, const int nice);
1918 extern int task_curr(const struct task_struct *p);
1919 extern int idle_cpu(int cpu);
1920 extern int sched_setscheduler(struct task_struct *, int,
1921 const struct sched_param *);
1922 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1923 const struct sched_param *);
1924 extern struct task_struct *idle_task(int cpu);
1925 /**
1926 * is_idle_task - is the specified task an idle task?
1927 * @p: the task in question.
1928 */
1929 static inline bool is_idle_task(const struct task_struct *p)
1930 {
1931 return p->pid == 0;
1932 }
1933 extern struct task_struct *curr_task(int cpu);
1934 extern void set_curr_task(int cpu, struct task_struct *p);
1935
1936 void yield(void);
1937
1938 /*
1939 * The default (Linux) execution domain.
1940 */
1941 extern struct exec_domain default_exec_domain;
1942
1943 union thread_union {
1944 struct thread_info thread_info;
1945 unsigned long stack[THREAD_SIZE/sizeof(long)];
1946 };
1947
1948 #ifndef __HAVE_ARCH_KSTACK_END
1949 static inline int kstack_end(void *addr)
1950 {
1951 /* Reliable end of stack detection:
1952 * Some APM bios versions misalign the stack
1953 */
1954 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1955 }
1956 #endif
1957
1958 extern union thread_union init_thread_union;
1959 extern struct task_struct init_task;
1960
1961 extern struct mm_struct init_mm;
1962
1963 extern struct pid_namespace init_pid_ns;
1964
1965 /*
1966 * find a task by one of its numerical ids
1967 *
1968 * find_task_by_pid_ns():
1969 * finds a task by its pid in the specified namespace
1970 * find_task_by_vpid():
1971 * finds a task by its virtual pid
1972 *
1973 * see also find_vpid() etc in include/linux/pid.h
1974 */
1975
1976 extern struct task_struct *find_task_by_vpid(pid_t nr);
1977 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1978 struct pid_namespace *ns);
1979
1980 extern void __set_special_pids(struct pid *pid);
1981
1982 /* per-UID process charging. */
1983 extern struct user_struct * alloc_uid(kuid_t);
1984 static inline struct user_struct *get_uid(struct user_struct *u)
1985 {
1986 atomic_inc(&u->__count);
1987 return u;
1988 }
1989 extern void free_uid(struct user_struct *);
1990
1991 #include <asm/current.h>
1992
1993 extern void xtime_update(unsigned long ticks);
1994
1995 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1996 extern int wake_up_process(struct task_struct *tsk);
1997 extern void wake_up_new_task(struct task_struct *tsk);
1998 #ifdef CONFIG_SMP
1999 extern void kick_process(struct task_struct *tsk);
2000 #else
2001 static inline void kick_process(struct task_struct *tsk) { }
2002 #endif
2003 extern void sched_fork(struct task_struct *p);
2004 extern void sched_dead(struct task_struct *p);
2005
2006 extern void proc_caches_init(void);
2007 extern void flush_signals(struct task_struct *);
2008 extern void __flush_signals(struct task_struct *);
2009 extern void ignore_signals(struct task_struct *);
2010 extern void flush_signal_handlers(struct task_struct *, int force_default);
2011 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2012
2013 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2014 {
2015 unsigned long flags;
2016 int ret;
2017
2018 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2019 ret = dequeue_signal(tsk, mask, info);
2020 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2021
2022 return ret;
2023 }
2024
2025 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2026 sigset_t *mask);
2027 extern void unblock_all_signals(void);
2028 extern void release_task(struct task_struct * p);
2029 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2030 extern int force_sigsegv(int, struct task_struct *);
2031 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2032 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2033 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2034 extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2035 const struct cred *, u32);
2036 extern int kill_pgrp(struct pid *pid, int sig, int priv);
2037 extern int kill_pid(struct pid *pid, int sig, int priv);
2038 extern int kill_proc_info(int, struct siginfo *, pid_t);
2039 extern __must_check bool do_notify_parent(struct task_struct *, int);
2040 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2041 extern void force_sig(int, struct task_struct *);
2042 extern int send_sig(int, struct task_struct *, int);
2043 extern int zap_other_threads(struct task_struct *p);
2044 extern struct sigqueue *sigqueue_alloc(void);
2045 extern void sigqueue_free(struct sigqueue *);
2046 extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
2047 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2048
2049 static inline void restore_saved_sigmask(void)
2050 {
2051 if (test_and_clear_restore_sigmask())
2052 __set_current_blocked(¤t->saved_sigmask);
2053 }
2054
2055 static inline sigset_t *sigmask_to_save(void)
2056 {
2057 sigset_t *res = ¤t->blocked;
2058 if (unlikely(test_restore_sigmask()))
2059 res = ¤t->saved_sigmask;
2060 return res;
2061 }
2062
2063 static inline int kill_cad_pid(int sig, int priv)
2064 {
2065 return kill_pid(cad_pid, sig, priv);
2066 }
2067
2068 /* These can be the second arg to send_sig_info/send_group_sig_info. */
2069 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
2070 #define SEND_SIG_PRIV ((struct siginfo *) 1)
2071 #define SEND_SIG_FORCED ((struct siginfo *) 2)
2072
2073 /*
2074 * True if we are on the alternate signal stack.
2075 */
2076 static inline int on_sig_stack(unsigned long sp)
2077 {
2078 #ifdef CONFIG_STACK_GROWSUP
2079 return sp >= current->sas_ss_sp &&
2080 sp - current->sas_ss_sp < current->sas_ss_size;
2081 #else
2082 return sp > current->sas_ss_sp &&
2083 sp - current->sas_ss_sp <= current->sas_ss_size;
2084 #endif
2085 }
2086
2087 static inline int sas_ss_flags(unsigned long sp)
2088 {
2089 return (current->sas_ss_size == 0 ? SS_DISABLE
2090 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2091 }
2092
2093 static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
2094 {
2095 if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
2096 #ifdef CONFIG_STACK_GROWSUP
2097 return current->sas_ss_sp;
2098 #else
2099 return current->sas_ss_sp + current->sas_ss_size;
2100 #endif
2101 return sp;
2102 }
2103
2104 /*
2105 * Routines for handling mm_structs
2106 */
2107 extern struct mm_struct * mm_alloc(void);
2108
2109 /* mmdrop drops the mm and the page tables */
2110 extern void __mmdrop(struct mm_struct *);
2111 static inline void mmdrop(struct mm_struct * mm)
2112 {
2113 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2114 __mmdrop(mm);
2115 }
2116
2117 /* mmput gets rid of the mappings and all user-space */
2118 extern void mmput(struct mm_struct *);
2119 /* Grab a reference to a task's mm, if it is not already going away */
2120 extern struct mm_struct *get_task_mm(struct task_struct *task);
2121 /*
2122 * Grab a reference to a task's mm, if it is not already going away
2123 * and ptrace_may_access with the mode parameter passed to it
2124 * succeeds.
2125 */
2126 extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
2127 /* Remove the current tasks stale references to the old mm_struct */
2128 extern void mm_release(struct task_struct *, struct mm_struct *);
2129 /* Allocate a new mm structure and copy contents from tsk->mm */
2130 extern struct mm_struct *dup_mm(struct task_struct *tsk);
2131
2132 extern int copy_thread(unsigned long, unsigned long, unsigned long,
2133 struct task_struct *);
2134 extern void flush_thread(void);
2135 extern void exit_thread(void);
2136
2137 extern void exit_files(struct task_struct *);
2138 extern void __cleanup_sighand(struct sighand_struct *);
2139
2140 extern void exit_itimers(struct signal_struct *);
2141 extern void flush_itimer_signals(void);
2142
2143 extern void do_group_exit(int);
2144
2145 extern int allow_signal(int);
2146 extern int disallow_signal(int);
2147
2148 extern int do_execve(const char *,
2149 const char __user * const __user *,
2150 const char __user * const __user *);
2151 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2152 struct task_struct *fork_idle(int);
2153 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
2154
2155 extern void set_task_comm(struct task_struct *tsk, char *from);
2156 extern char *get_task_comm(char *to, struct task_struct *tsk);
2157
2158 #ifdef CONFIG_SMP
2159 void scheduler_ipi(void);
2160 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2161 #else
2162 static inline void scheduler_ipi(void) { }
2163 static inline unsigned long wait_task_inactive(struct task_struct *p,
2164 long match_state)
2165 {
2166 return 1;
2167 }
2168 #endif
2169
2170 #define next_task(p) \
2171 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2172
2173 #define for_each_process(p) \
2174 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2175
2176 extern bool current_is_single_threaded(void);
2177
2178 /*
2179 * Careful: do_each_thread/while_each_thread is a double loop so
2180 * 'break' will not work as expected - use goto instead.
2181 */
2182 #define do_each_thread(g, t) \
2183 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2184
2185 #define while_each_thread(g, t) \
2186 while ((t = next_thread(t)) != g)
2187
2188 #define __for_each_thread(signal, t) \
2189 list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
2190
2191 #define for_each_thread(p, t) \
2192 __for_each_thread((p)->signal, t)
2193
2194 /* Careful: this is a double loop, 'break' won't work as expected. */
2195 #define for_each_process_thread(p, t) \
2196 for_each_process(p) for_each_thread(p, t)
2197
2198 static inline int get_nr_threads(struct task_struct *tsk)
2199 {
2200 return tsk->signal->nr_threads;
2201 }
2202
2203 static inline bool thread_group_leader(struct task_struct *p)
2204 {
2205 return p->exit_signal >= 0;
2206 }
2207
2208 /* Do to the insanities of de_thread it is possible for a process
2209 * to have the pid of the thread group leader without actually being
2210 * the thread group leader. For iteration through the pids in proc
2211 * all we care about is that we have a task with the appropriate
2212 * pid, we don't actually care if we have the right task.
2213 */
2214 static inline bool has_group_leader_pid(struct task_struct *p)
2215 {
2216 return task_pid(p) == p->signal->leader_pid;
2217 }
2218
2219 static inline
2220 bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
2221 {
2222 return p1->signal == p2->signal;
2223 }
2224
2225 static inline struct task_struct *next_thread(const struct task_struct *p)
2226 {
2227 return list_entry_rcu(p->thread_group.next,
2228 struct task_struct, thread_group);
2229 }
2230
2231 static inline int thread_group_empty(struct task_struct *p)
2232 {
2233 return list_empty(&p->thread_group);
2234 }
2235
2236 #define delay_group_leader(p) \
2237 (thread_group_leader(p) && !thread_group_empty(p))
2238
2239 /*
2240 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2241 * subscriptions and synchronises with wait4(). Also used in procfs. Also
2242 * pins the final release of task.io_context. Also protects ->cpuset and
2243 * ->cgroup.subsys[]. And ->vfork_done.
2244 *
2245 * Nests both inside and outside of read_lock(&tasklist_lock).
2246 * It must not be nested with write_lock_irq(&tasklist_lock),
2247 * neither inside nor outside.
2248 */
2249 static inline void task_lock(struct task_struct *p)
2250 {
2251 spin_lock(&p->alloc_lock);
2252 }
2253
2254 static inline void task_unlock(struct task_struct *p)
2255 {
2256 spin_unlock(&p->alloc_lock);
2257 }
2258
2259 extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2260 unsigned long *flags);
2261
2262 static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2263 unsigned long *flags)
2264 {
2265 struct sighand_struct *ret;
2266
2267 ret = __lock_task_sighand(tsk, flags);
2268 (void)__cond_lock(&tsk->sighand->siglock, ret);
2269 return ret;
2270 }
2271
2272 static inline void unlock_task_sighand(struct task_struct *tsk,
2273 unsigned long *flags)
2274 {
2275 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2276 }
2277
2278 #ifdef CONFIG_CGROUPS
2279 static inline void threadgroup_change_begin(struct task_struct *tsk)
2280 {
2281 down_read(&tsk->signal->group_rwsem);
2282 }
2283 static inline void threadgroup_change_end(struct task_struct *tsk)
2284 {
2285 up_read(&tsk->signal->group_rwsem);
2286 }
2287
2288 /**
2289 * threadgroup_lock - lock threadgroup
2290 * @tsk: member task of the threadgroup to lock
2291 *
2292 * Lock the threadgroup @tsk belongs to. No new task is allowed to enter
2293 * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
2294 * change ->group_leader/pid. This is useful for cases where the threadgroup
2295 * needs to stay stable across blockable operations.
2296 *
2297 * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
2298 * synchronization. While held, no new task will be added to threadgroup
2299 * and no existing live task will have its PF_EXITING set.
2300 *
2301 * de_thread() does threadgroup_change_{begin|end}() when a non-leader
2302 * sub-thread becomes a new leader.
2303 */
2304 static inline void threadgroup_lock(struct task_struct *tsk)
2305 {
2306 down_write(&tsk->signal->group_rwsem);
2307 }
2308
2309 /**
2310 * threadgroup_unlock - unlock threadgroup
2311 * @tsk: member task of the threadgroup to unlock
2312 *
2313 * Reverse threadgroup_lock().
2314 */
2315 static inline void threadgroup_unlock(struct task_struct *tsk)
2316 {
2317 up_write(&tsk->signal->group_rwsem);
2318 }
2319 #else
2320 static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2321 static inline void threadgroup_change_end(struct task_struct *tsk) {}
2322 static inline void threadgroup_lock(struct task_struct *tsk) {}
2323 static inline void threadgroup_unlock(struct task_struct *tsk) {}
2324 #endif
2325
2326 #ifndef __HAVE_THREAD_FUNCTIONS
2327
2328 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
2329 #define task_stack_page(task) ((task)->stack)
2330
2331 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2332 {
2333 *task_thread_info(p) = *task_thread_info(org);
2334 task_thread_info(p)->task = p;
2335 }
2336
2337 static inline unsigned long *end_of_stack(struct task_struct *p)
2338 {
2339 return (unsigned long *)(task_thread_info(p) + 1);
2340 }
2341
2342 #endif
2343
2344 static inline int object_is_on_stack(void *obj)
2345 {
2346 void *stack = task_stack_page(current);
2347
2348 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2349 }
2350
2351 extern void thread_info_cache_init(void);
2352
2353 #ifdef CONFIG_DEBUG_STACK_USAGE
2354 static inline unsigned long stack_not_used(struct task_struct *p)
2355 {
2356 unsigned long *n = end_of_stack(p);
2357
2358 do { /* Skip over canary */
2359 n++;
2360 } while (!*n);
2361
2362 return (unsigned long)n - (unsigned long)end_of_stack(p);
2363 }
2364 #endif
2365
2366 /* set thread flags in other task's structures
2367 * - see asm/thread_info.h for TIF_xxxx flags available
2368 */
2369 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2370 {
2371 set_ti_thread_flag(task_thread_info(tsk), flag);
2372 }
2373
2374 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2375 {
2376 clear_ti_thread_flag(task_thread_info(tsk), flag);
2377 }
2378
2379 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2380 {
2381 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2382 }
2383
2384 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2385 {
2386 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2387 }
2388
2389 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2390 {
2391 return test_ti_thread_flag(task_thread_info(tsk), flag);
2392 }
2393
2394 static inline void set_tsk_need_resched(struct task_struct *tsk)
2395 {
2396 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2397 }
2398
2399 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2400 {
2401 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2402 }
2403
2404 static inline int test_tsk_need_resched(struct task_struct *tsk)
2405 {
2406 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2407 }
2408
2409 static inline int restart_syscall(void)
2410 {
2411 set_tsk_thread_flag(current, TIF_SIGPENDING);
2412 return -ERESTARTNOINTR;
2413 }
2414
2415 static inline int signal_pending(struct task_struct *p)
2416 {
2417 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2418 }
2419
2420 static inline int __fatal_signal_pending(struct task_struct *p)
2421 {
2422 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2423 }
2424
2425 static inline int fatal_signal_pending(struct task_struct *p)
2426 {
2427 return signal_pending(p) && __fatal_signal_pending(p);
2428 }
2429
2430 static inline int signal_pending_state(long state, struct task_struct *p)
2431 {
2432 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2433 return 0;
2434 if (!signal_pending(p))
2435 return 0;
2436
2437 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2438 }
2439
2440 static inline int need_resched(void)
2441 {
2442 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2443 }
2444
2445 /*
2446 * cond_resched() and cond_resched_lock(): latency reduction via
2447 * explicit rescheduling in places that are safe. The return
2448 * value indicates whether a reschedule was done in fact.
2449 * cond_resched_lock() will drop the spinlock before scheduling,
2450 * cond_resched_softirq() will enable bhs before scheduling.
2451 */
2452 extern int _cond_resched(void);
2453
2454 #define cond_resched() ({ \
2455 __might_sleep(__FILE__, __LINE__, 0); \
2456 _cond_resched(); \
2457 })
2458
2459 extern int __cond_resched_lock(spinlock_t *lock);
2460
2461 #ifdef CONFIG_PREEMPT_COUNT
2462 #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
2463 #else
2464 #define PREEMPT_LOCK_OFFSET 0
2465 #endif
2466
2467 #define cond_resched_lock(lock) ({ \
2468 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2469 __cond_resched_lock(lock); \
2470 })
2471
2472 extern int __cond_resched_softirq(void);
2473
2474 #define cond_resched_softirq() ({ \
2475 __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
2476 __cond_resched_softirq(); \
2477 })
2478
2479 /*
2480 * Does a critical section need to be broken due to another
2481 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2482 * but a general need for low latency)
2483 */
2484 static inline int spin_needbreak(spinlock_t *lock)
2485 {
2486 #ifdef CONFIG_PREEMPT
2487 return spin_is_contended(lock);
2488 #else
2489 return 0;
2490 #endif
2491 }
2492
2493 /*
2494 * Idle thread specific functions to determine the need_resched
2495 * polling state. We have two versions, one based on TS_POLLING in
2496 * thread_info.status and one based on TIF_POLLING_NRFLAG in
2497 * thread_info.flags
2498 */
2499 #ifdef TS_POLLING
2500 static inline int tsk_is_polling(struct task_struct *p)
2501 {
2502 return task_thread_info(p)->status & TS_POLLING;
2503 }
2504 static inline void __current_set_polling(void)
2505 {
2506 current_thread_info()->status |= TS_POLLING;
2507 }
2508
2509 static inline bool __must_check current_set_polling_and_test(void)
2510 {
2511 __current_set_polling();
2512
2513 /*
2514 * Polling state must be visible before we test NEED_RESCHED,
2515 * paired by resched_task()
2516 */
2517 smp_mb();
2518
2519 return unlikely(tif_need_resched());
2520 }
2521
2522 static inline void __current_clr_polling(void)
2523 {
2524 current_thread_info()->status &= ~TS_POLLING;
2525 }
2526
2527 static inline bool __must_check current_clr_polling_and_test(void)
2528 {
2529 __current_clr_polling();
2530
2531 /*
2532 * Polling state must be visible before we test NEED_RESCHED,
2533 * paired by resched_task()
2534 */
2535 smp_mb();
2536
2537 return unlikely(tif_need_resched());
2538 }
2539 #elif defined(TIF_POLLING_NRFLAG)
2540 static inline int tsk_is_polling(struct task_struct *p)
2541 {
2542 return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
2543 }
2544
2545 static inline void __current_set_polling(void)
2546 {
2547 set_thread_flag(TIF_POLLING_NRFLAG);
2548 }
2549
2550 static inline bool __must_check current_set_polling_and_test(void)
2551 {
2552 __current_set_polling();
2553
2554 /*
2555 * Polling state must be visible before we test NEED_RESCHED,
2556 * paired by resched_task()
2557 *
2558 * XXX: assumes set/clear bit are identical barrier wise.
2559 */
2560 smp_mb__after_clear_bit();
2561
2562 return unlikely(tif_need_resched());
2563 }
2564
2565 static inline void __current_clr_polling(void)
2566 {
2567 clear_thread_flag(TIF_POLLING_NRFLAG);
2568 }
2569
2570 static inline bool __must_check current_clr_polling_and_test(void)
2571 {
2572 __current_clr_polling();
2573
2574 /*
2575 * Polling state must be visible before we test NEED_RESCHED,
2576 * paired by resched_task()
2577 */
2578 smp_mb__after_clear_bit();
2579
2580 return unlikely(tif_need_resched());
2581 }
2582
2583 #else
2584 static inline int tsk_is_polling(struct task_struct *p) { return 0; }
2585 static inline void __current_set_polling(void) { }
2586 static inline void __current_clr_polling(void) { }
2587
2588 static inline bool __must_check current_set_polling_and_test(void)
2589 {
2590 return unlikely(tif_need_resched());
2591 }
2592 static inline bool __must_check current_clr_polling_and_test(void)
2593 {
2594 return unlikely(tif_need_resched());
2595 }
2596 #endif
2597
2598 /*
2599 * Thread group CPU time accounting.
2600 */
2601 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2602 void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2603
2604 static inline void thread_group_cputime_init(struct signal_struct *sig)
2605 {
2606 raw_spin_lock_init(&sig->cputimer.lock);
2607 }
2608
2609 /*
2610 * Reevaluate whether the task has signals pending delivery.
2611 * Wake the task if so.
2612 * This is required every time the blocked sigset_t changes.
2613 * callers must hold sighand->siglock.
2614 */
2615 extern void recalc_sigpending_and_wake(struct task_struct *t);
2616 extern void recalc_sigpending(void);
2617
2618 extern void signal_wake_up_state(struct task_struct *t, unsigned int state);
2619
2620 static inline void signal_wake_up(struct task_struct *t, bool resume)
2621 {
2622 signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
2623 }
2624 static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
2625 {
2626 signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
2627 }
2628
2629 /*
2630 * Wrappers for p->thread_info->cpu access. No-op on UP.
2631 */
2632 #ifdef CONFIG_SMP
2633
2634 static inline unsigned int task_cpu(const struct task_struct *p)
2635 {
2636 return task_thread_info(p)->cpu;
2637 }
2638
2639 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2640
2641 #else
2642
2643 static inline unsigned int task_cpu(const struct task_struct *p)
2644 {
2645 return 0;
2646 }
2647
2648 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2649 {
2650 }
2651
2652 #endif /* CONFIG_SMP */
2653
2654 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2655 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2656
2657 #ifdef CONFIG_CGROUP_SCHED
2658 extern struct task_group root_task_group;
2659 #endif /* CONFIG_CGROUP_SCHED */
2660
2661 extern int task_can_switch_user(struct user_struct *up,
2662 struct task_struct *tsk);
2663
2664 #ifdef CONFIG_TASK_XACCT
2665 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2666 {
2667 tsk->ioac.rchar += amt;
2668 }
2669
2670 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2671 {
2672 tsk->ioac.wchar += amt;
2673 }
2674
2675 static inline void inc_syscr(struct task_struct *tsk)
2676 {
2677 tsk->ioac.syscr++;
2678 }
2679
2680 static inline void inc_syscw(struct task_struct *tsk)
2681 {
2682 tsk->ioac.syscw++;
2683 }
2684 #else
2685 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2686 {
2687 }
2688
2689 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2690 {
2691 }
2692
2693 static inline void inc_syscr(struct task_struct *tsk)
2694 {
2695 }
2696
2697 static inline void inc_syscw(struct task_struct *tsk)
2698 {
2699 }
2700 #endif
2701
2702 #ifndef TASK_SIZE_OF
2703 #define TASK_SIZE_OF(tsk) TASK_SIZE
2704 #endif
2705
2706 #ifdef CONFIG_MM_OWNER
2707 extern void mm_update_next_owner(struct mm_struct *mm);
2708 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2709 #else
2710 static inline void mm_update_next_owner(struct mm_struct *mm)
2711 {
2712 }
2713
2714 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2715 {
2716 }
2717 #endif /* CONFIG_MM_OWNER */
2718
2719 static inline unsigned long task_rlimit(const struct task_struct *tsk,
2720 unsigned int limit)
2721 {
2722 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2723 }
2724
2725 static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2726 unsigned int limit)
2727 {
2728 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2729 }
2730
2731 static inline unsigned long rlimit(unsigned int limit)
2732 {
2733 return task_rlimit(current, limit);
2734 }
2735
2736 static inline unsigned long rlimit_max(unsigned int limit)
2737 {
2738 return task_rlimit_max(current, limit);
2739 }
2740
2741 #endif
2742
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