projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
exit: exit_notify() can trust signal->notify_count < 0
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / sched.h
CommitLineData
1da177e4
LT		 1#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
b7b3c76a
DW		 4/*
5 * cloning flags:
6 */
7#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
8#define CLONE_VM 0x00000100 /* set if VM shared between processes */
9#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
10#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
11#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
12#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
13#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
14#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
15#define CLONE_THREAD 0x00010000 /* Same thread group? */
16#define CLONE_NEWNS 0x00020000 /* New namespace group? */
17#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
18#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
19#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
20#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
21#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
22#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
23#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
24#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
071df104 25#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
25b21cb2 26#define CLONE_NEWIPC 0x08000000 /* New ipcs */
77ec739d 27#define CLONE_NEWUSER 0x10000000 /* New user namespace */
30e49c26 28#define CLONE_NEWPID 0x20000000 /* New pid namespace */
169e3674 29#define CLONE_NEWNET 0x40000000 /* New network namespace */
fadad878 30#define CLONE_IO 0x80000000 /* Clone io context */
b7b3c76a
DW		 31
32/*
33 * Scheduling policies
34 */
35#define SCHED_NORMAL 0
36#define SCHED_FIFO 1
37#define SCHED_RR 2
38#define SCHED_BATCH 3
0e6aca43
IM		 39/* SCHED_ISO: reserved but not implemented yet */
40#define SCHED_IDLE 5
ca94c442
LP		 41/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
42#define SCHED_RESET_ON_FORK 0x40000000
b7b3c76a 43
a3b6714e 44#ifdef __KERNEL__
b7b3c76a
DW		 45
46struct sched_param {
47 int sched_priority;
48};
49
1da177e4
LT		 50#include <asm/param.h> /* for HZ */
51
1da177e4
LT		 52#include <linux/capability.h>
53#include <linux/threads.h>
54#include <linux/kernel.h>
55#include <linux/types.h>
56#include <linux/timex.h>
57#include <linux/jiffies.h>
58#include <linux/rbtree.h>
59#include <linux/thread_info.h>
60#include <linux/cpumask.h>
61#include <linux/errno.h>
62#include <linux/nodemask.h>
c92ff1bd 63#include <linux/mm_types.h>
1da177e4
LT		 64
65#include <asm/system.h>
1da177e4
LT		 66#include <asm/page.h>
67#include <asm/ptrace.h>
1da177e4
LT		 68#include <asm/cputime.h>
69
70#include <linux/smp.h>
71#include <linux/sem.h>
72#include <linux/signal.h>
5ad4e53b 73#include <linux/path.h>
1da177e4
LT		 74#include <linux/compiler.h>
75#include <linux/completion.h>
76#include <linux/pid.h>
77#include <linux/percpu.h>
78#include <linux/topology.h>
3e26c149 79#include <linux/proportions.h>
1da177e4 80#include <linux/seccomp.h>
e56d0903 81#include <linux/rcupdate.h>
05725f7e 82#include <linux/rculist.h>
23f78d4a 83#include <linux/rtmutex.h>
1da177e4 84
a3b6714e
DW		 85#include <linux/time.h>
86#include <linux/param.h>
87#include <linux/resource.h>
88#include <linux/timer.h>
89#include <linux/hrtimer.h>
7c3ab738 90#include <linux/task_io_accounting.h>
5cb350ba 91#include <linux/kobject.h>
9745512c 92#include <linux/latencytop.h>
9e2b2dc4 93#include <linux/cred.h>
a3b6714e
DW		 94
95#include <asm/processor.h>
36d57ac4 96
1da177e4 97struct exec_domain;
c87e2837 98struct futex_pi_state;
286100a6 99struct robust_list_head;
bddd87c7 100struct bio_list;
5ad4e53b 101struct fs_struct;
cdd6c482 102struct perf_event_context;
1da177e4 103
1da177e4
LT		 104/*
105 * List of flags we want to share for kernel threads,
106 * if only because they are not used by them anyway.
107 */
108#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
109
110/*
111 * These are the constant used to fake the fixed-point load-average
112 * counting. Some notes:
113 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
114 * a load-average precision of 10 bits integer + 11 bits fractional
115 * - if you want to count load-averages more often, you need more
116 * precision, or rounding will get you. With 2-second counting freq,
117 * the EXP_n values would be 1981, 2034 and 2043 if still using only
118 * 11 bit fractions.
119 */
120extern unsigned long avenrun[]; /* Load averages */
2d02494f 121extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
1da177e4
LT		 122
123#define FSHIFT 11 /* nr of bits of precision */
124#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
0c2043ab 125#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
1da177e4
LT		 126#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
127#define EXP_5 2014 /* 1/exp(5sec/5min) */
128#define EXP_15 2037 /* 1/exp(5sec/15min) */
129
130#define CALC_LOAD(load,exp,n) \
131 load *= exp; \
132 load += n*(FIXED_1-exp); \
133 load >>= FSHIFT;
134
135extern unsigned long total_forks;
136extern int nr_threads;
1da177e4
LT		 137DECLARE_PER_CPU(unsigned long, process_counts);
138extern int nr_processes(void);
139extern unsigned long nr_running(void);
140extern unsigned long nr_uninterruptible(void);
141extern unsigned long nr_iowait(void);
69d25870
AV		 142extern unsigned long nr_iowait_cpu(void);
143extern unsigned long this_cpu_load(void);
144
145
dce48a84 146extern void calc_global_load(void);
1da177e4 147
7e49fcce
SR		 148extern unsigned long get_parent_ip(unsigned long addr);
149
43ae34cb
IM		 150struct seq_file;
151struct cfs_rq;
4cf86d77 152struct task_group;
43ae34cb
IM		 153#ifdef CONFIG_SCHED_DEBUG
154extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
155extern void proc_sched_set_task(struct task_struct *p);
156extern void
5cef9eca 157print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
43ae34cb
IM		 158#else
159static inline void
160proc_sched_show_task(struct task_struct *p, struct seq_file *m)
161{
162}
163static inline void proc_sched_set_task(struct task_struct *p)
164{
165}
166static inline void
5cef9eca 167print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
43ae34cb
IM		 168{
169}
170#endif
1da177e4 171
4a8342d2
LT		 172/*
173 * Task state bitmask. NOTE! These bits are also
174 * encoded in fs/proc/array.c: get_task_state().
175 *
176 * We have two separate sets of flags: task->state
177 * is about runnability, while task->exit_state are
178 * about the task exiting. Confusing, but this way
179 * modifying one set can't modify the other one by
180 * mistake.
181 */
1da177e4
LT		 182#define TASK_RUNNING 0
183#define TASK_INTERRUPTIBLE 1
184#define TASK_UNINTERRUPTIBLE 2
f021a3c2
MW		 185#define __TASK_STOPPED 4
186#define __TASK_TRACED 8
4a8342d2
LT		 187/* in tsk->exit_state */
188#define EXIT_ZOMBIE 16
189#define EXIT_DEAD 32
190/* in tsk->state again */
af927232 191#define TASK_DEAD 64
f021a3c2 192#define TASK_WAKEKILL 128
e9c84311 193#define TASK_WAKING 256
e1781538 194#define TASK_STATE_MAX 512
f021a3c2 195
44d90df6 196#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
73342151 197
e1781538
PZ		 198extern char ___assert_task_state[1 - 2*!!(
199 sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
f021a3c2
MW		 200
201/* Convenience macros for the sake of set_task_state */
202#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
203#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
204#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
1da177e4 205
92a1f4bc
MW		 206/* Convenience macros for the sake of wake_up */
207#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
f021a3c2 208#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
92a1f4bc
MW		 209
210/* get_task_state() */
211#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
f021a3c2
MW		 212 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
213 __TASK_TRACED)
92a1f4bc 214
f021a3c2
MW		 215#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
216#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
92a1f4bc 217#define task_is_stopped_or_traced(task) \
f021a3c2 218 ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
92a1f4bc 219#define task_contributes_to_load(task) \
e3c8ca83 220 ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
6301cb95 221 (task->flags & PF_FREEZING) == 0)
1da177e4
LT		 222
223#define __set_task_state(tsk, state_value) \
224 do { (tsk)->state = (state_value); } while (0)
225#define set_task_state(tsk, state_value) \
226 set_mb((tsk)->state, (state_value))
227
498d0c57
AM		 228/*
229 * set_current_state() includes a barrier so that the write of current->state
230 * is correctly serialised wrt the caller's subsequent test of whether to
231 * actually sleep:
232 *
233 * set_current_state(TASK_UNINTERRUPTIBLE);
234 * if (do_i_need_to_sleep())
235 * schedule();
236 *
237 * If the caller does not need such serialisation then use __set_current_state()
238 */
1da177e4
LT		 239#define __set_current_state(state_value) \
240 do { current->state = (state_value); } while (0)
241#define set_current_state(state_value) \
242 set_mb(current->state, (state_value))
243
244/* Task command name length */
245#define TASK_COMM_LEN 16
246
1da177e4
LT		 247#include <linux/spinlock.h>
248
249/*
250 * This serializes "schedule()" and also protects
251 * the run-queue from deletions/modifications (but
252 * _adding_ to the beginning of the run-queue has
253 * a separate lock).
254 */
255extern rwlock_t tasklist_lock;
256extern spinlock_t mmlist_lock;
257
36c8b586 258struct task_struct;
1da177e4 259
db1466b3
PM		 260#ifdef CONFIG_PROVE_RCU
261extern int lockdep_tasklist_lock_is_held(void);
262#endif /* #ifdef CONFIG_PROVE_RCU */
263
1da177e4
LT		 264extern void sched_init(void);
265extern void sched_init_smp(void);
2d07b255 266extern asmlinkage void schedule_tail(struct task_struct *prev);
36c8b586 267extern void init_idle(struct task_struct *idle, int cpu);
1df21055 268extern void init_idle_bootup_task(struct task_struct *idle);
1da177e4 269
89f19f04 270extern int runqueue_is_locked(int cpu);
ad474cac 271extern void task_rq_unlock_wait(struct task_struct *p);
017730c1 272
6a7b3dc3 273extern cpumask_var_t nohz_cpu_mask;
46cb4b7c
SS		 274#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
275extern int select_nohz_load_balancer(int cpu);
eea08f32 276extern int get_nohz_load_balancer(void);
39c0cbe2 277extern int nohz_ratelimit(int cpu);
46cb4b7c
SS		 278#else
279static inline int select_nohz_load_balancer(int cpu)
280{
281 return 0;
282}
39c0cbe2
MG		 283
284static inline int nohz_ratelimit(int cpu)
285{
286 return 0;
287}
46cb4b7c 288#endif
1da177e4 289
e59e2ae2 290/*
39bc89fd 291 * Only dump TASK_* tasks. (0 for all tasks)
e59e2ae2
IM		 292 */
293extern void show_state_filter(unsigned long state_filter);
294
295static inline void show_state(void)
296{
39bc89fd 297 show_state_filter(0);
e59e2ae2
IM		 298}
299
1da177e4
LT		 300extern void show_regs(struct pt_regs *);
301
302/*
303 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
304 * task), SP is the stack pointer of the first frame that should be shown in the back
305 * trace (or NULL if the entire call-chain of the task should be shown).
306 */
307extern void show_stack(struct task_struct *task, unsigned long *sp);
308
309void io_schedule(void);
310long io_schedule_timeout(long timeout);
311
312extern void cpu_init (void);
313extern void trap_init(void);
314extern void update_process_times(int user);
315extern void scheduler_tick(void);
316
82a1fcb9
IM		 317extern void sched_show_task(struct task_struct *p);
318
8446f1d3 319#ifdef CONFIG_DETECT_SOFTLOCKUP
6687a97d 320extern void softlockup_tick(void);
8446f1d3 321extern void touch_softlockup_watchdog(void);
d6ad3e28 322extern void touch_softlockup_watchdog_sync(void);
04c9167f 323extern void touch_all_softlockup_watchdogs(void);
baf48f65 324extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
8d65af78 325 void __user *buffer,
baf48f65 326 size_t *lenp, loff_t *ppos);
9c44bc03 327extern unsigned int softlockup_panic;
9383d967 328extern int softlockup_thresh;
8446f1d3 329#else
6687a97d 330static inline void softlockup_tick(void)
8446f1d3
IM		 331{
332}
8446f1d3
IM		 333static inline void touch_softlockup_watchdog(void)
334{
335}
d6ad3e28
JW		 336static inline void touch_softlockup_watchdog_sync(void)
337{
338}
04c9167f
JF		 339static inline void touch_all_softlockup_watchdogs(void)
340{
341}
8446f1d3
IM		 342#endif
343
e162b39a
MSB		 344#ifdef CONFIG_DETECT_HUNG_TASK
345extern unsigned int sysctl_hung_task_panic;
346extern unsigned long sysctl_hung_task_check_count;
347extern unsigned long sysctl_hung_task_timeout_secs;
348extern unsigned long sysctl_hung_task_warnings;
349extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
8d65af78 350 void __user *buffer,
e162b39a
MSB		 351 size_t *lenp, loff_t *ppos);
352#endif
8446f1d3 353
1da177e4
LT		 354/* Attach to any functions which should be ignored in wchan output. */
355#define __sched __attribute__((__section__(".sched.text")))
deaf2227
IM		 356
357/* Linker adds these: start and end of __sched functions */
358extern char __sched_text_start[], __sched_text_end[];
359
1da177e4
LT		 360/* Is this address in the __sched functions? */
361extern int in_sched_functions(unsigned long addr);
362
363#define MAX_SCHEDULE_TIMEOUT LONG_MAX
b3c97528 364extern signed long schedule_timeout(signed long timeout);
64ed93a2 365extern signed long schedule_timeout_interruptible(signed long timeout);
294d5cc2 366extern signed long schedule_timeout_killable(signed long timeout);
64ed93a2 367extern signed long schedule_timeout_uninterruptible(signed long timeout);
1da177e4 368asmlinkage void schedule(void);
0d66bf6d 369extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
1da177e4 370
ab516013 371struct nsproxy;
acce292c 372struct user_namespace;
1da177e4 373
341c87bf
KH		 374/*
375 * Default maximum number of active map areas, this limits the number of vmas
376 * per mm struct. Users can overwrite this number by sysctl but there is a
377 * problem.
378 *
379 * When a program's coredump is generated as ELF format, a section is created
380 * per a vma. In ELF, the number of sections is represented in unsigned short.
381 * This means the number of sections should be smaller than 65535 at coredump.
382 * Because the kernel adds some informative sections to a image of program at
383 * generating coredump, we need some margin. The number of extra sections is
384 * 1-3 now and depends on arch. We use "5" as safe margin, here.
385 */
386#define MAPCOUNT_ELF_CORE_MARGIN (5)
4be929be 387#define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
1da177e4
LT		 388
389extern int sysctl_max_map_count;
390
391#include <linux/aio.h>
392
efc1a3b1
DH		 393#ifdef CONFIG_MMU
394extern void arch_pick_mmap_layout(struct mm_struct *mm);
1da177e4
LT		 395extern unsigned long
396arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
397 unsigned long, unsigned long);
398extern unsigned long
399arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
400 unsigned long len, unsigned long pgoff,
401 unsigned long flags);
1363c3cd
WW		 402extern void arch_unmap_area(struct mm_struct *, unsigned long);
403extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
efc1a3b1
DH		 404#else
405static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
406#endif
1da177e4 407
901608d9 408
6c5d5238
KH		 409extern void set_dumpable(struct mm_struct *mm, int value);
410extern int get_dumpable(struct mm_struct *mm);
411
412/* mm flags */
3cb4a0bb 413/* dumpable bits */
6c5d5238
KH		 414#define MMF_DUMPABLE 0 /* core dump is permitted */
415#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
f8af4da3 416
3cb4a0bb 417#define MMF_DUMPABLE_BITS 2
f8af4da3 418#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
3cb4a0bb
KH		 419
420/* coredump filter bits */
421#define MMF_DUMP_ANON_PRIVATE 2
422#define MMF_DUMP_ANON_SHARED 3
423#define MMF_DUMP_MAPPED_PRIVATE 4
424#define MMF_DUMP_MAPPED_SHARED 5
82df3973 425#define MMF_DUMP_ELF_HEADERS 6
e575f111
KM		 426#define MMF_DUMP_HUGETLB_PRIVATE 7
427#define MMF_DUMP_HUGETLB_SHARED 8
f8af4da3 428
3cb4a0bb 429#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
e575f111 430#define MMF_DUMP_FILTER_BITS 7
3cb4a0bb
KH		 431#define MMF_DUMP_FILTER_MASK \
432 (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
433#define MMF_DUMP_FILTER_DEFAULT \
e575f111 434 ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
656eb2cd
RM		 435 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
436
437#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
438# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
439#else
440# define MMF_DUMP_MASK_DEFAULT_ELF 0
441#endif
f8af4da3
HD		 442 /* leave room for more dump flags */
443#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
444
445#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
6c5d5238 446
1da177e4
LT		 447struct sighand_struct {
448 atomic_t count;
449 struct k_sigaction action[_NSIG];
450 spinlock_t siglock;
b8fceee1 451 wait_queue_head_t signalfd_wqh;
1da177e4
LT		 452};
453
0e464814 454struct pacct_struct {
f6ec29a4
KK		 455 int ac_flag;
456 long ac_exitcode;
0e464814 457 unsigned long ac_mem;
77787bfb
KK		 458 cputime_t ac_utime, ac_stime;
459 unsigned long ac_minflt, ac_majflt;
0e464814
KK		 460};
461
42c4ab41
SG		 462struct cpu_itimer {
463 cputime_t expires;
464 cputime_t incr;
8356b5f9
SG		 465 u32 error;
466 u32 incr_error;
42c4ab41
SG		 467};
468
f06febc9
FM		 469/**
470 * struct task_cputime - collected CPU time counts
471 * @utime: time spent in user mode, in &cputime_t units
472 * @stime: time spent in kernel mode, in &cputime_t units
473 * @sum_exec_runtime: total time spent on the CPU, in nanoseconds
5ce73a4a 474 *
f06febc9
FM		 475 * This structure groups together three kinds of CPU time that are
476 * tracked for threads and thread groups. Most things considering
477 * CPU time want to group these counts together and treat all three
478 * of them in parallel.
479 */
480struct task_cputime {
481 cputime_t utime;
482 cputime_t stime;
483 unsigned long long sum_exec_runtime;
484};
485/* Alternate field names when used to cache expirations. */
486#define prof_exp stime
487#define virt_exp utime
488#define sched_exp sum_exec_runtime
489
4cd4c1b4
PZ		 490#define INIT_CPUTIME \
491 (struct task_cputime) { \
492 .utime = cputime_zero, \
493 .stime = cputime_zero, \
494 .sum_exec_runtime = 0, \
495 }
496
c99e6efe
PZ		 497/*
498 * Disable preemption until the scheduler is running.
499 * Reset by start_kernel()->sched_init()->init_idle().
d86ee480
PZ		 500 *
501 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
502 * before the scheduler is active -- see should_resched().
c99e6efe 503 */
d86ee480 504#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
c99e6efe 505
f06febc9 506/**
4cd4c1b4
PZ		 507 * struct thread_group_cputimer - thread group interval timer counts
508 * @cputime: thread group interval timers.
509 * @running: non-zero when there are timers running and
510 * @cputime receives updates.
511 * @lock: lock for fields in this struct.
f06febc9
FM		 512 *
513 * This structure contains the version of task_cputime, above, that is
4cd4c1b4 514 * used for thread group CPU timer calculations.
f06febc9 515 */
4cd4c1b4
PZ		 516struct thread_group_cputimer {
517 struct task_cputime cputime;
518 int running;
519 spinlock_t lock;
f06febc9 520};
f06febc9 521
1da177e4
LT		 522/*
523 * NOTE! "signal_struct" does not have it's own
524 * locking, because a shared signal_struct always
525 * implies a shared sighand_struct, so locking
526 * sighand_struct is always a proper superset of
527 * the locking of signal_struct.
528 */
529struct signal_struct {
530 atomic_t count;
531 atomic_t live;
532
533 wait_queue_head_t wait_chldexit; /* for wait4() */
534
535 /* current thread group signal load-balancing target: */
36c8b586 536 struct task_struct *curr_target;
1da177e4
LT		 537
538 /* shared signal handling: */
539 struct sigpending shared_pending;
540
541 /* thread group exit support */
542 int group_exit_code;
543 /* overloaded:
544 * - notify group_exit_task when ->count is equal to notify_count
545 * - everyone except group_exit_task is stopped during signal delivery
546 * of fatal signals, group_exit_task processes the signal.
547 */
1da177e4 548 int notify_count;
07dd20e0 549 struct task_struct *group_exit_task;
1da177e4
LT		 550
551 /* thread group stop support, overloads group_exit_code too */
552 int group_stop_count;
553 unsigned int flags; /* see SIGNAL_* flags below */
554
555 /* POSIX.1b Interval Timers */
556 struct list_head posix_timers;
557
558 /* ITIMER_REAL timer for the process */
2ff678b8 559 struct hrtimer real_timer;
fea9d175 560 struct pid *leader_pid;
2ff678b8 561 ktime_t it_real_incr;
1da177e4 562
42c4ab41
SG		 563 /*
564 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
565 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
566 * values are defined to 0 and 1 respectively
567 */
568 struct cpu_itimer it[2];
1da177e4 569
f06febc9 570 /*
4cd4c1b4
PZ		 571 * Thread group totals for process CPU timers.
572 * See thread_group_cputimer(), et al, for details.
f06febc9 573 */
4cd4c1b4 574 struct thread_group_cputimer cputimer;
f06febc9
FM		 575
576 /* Earliest-expiration cache. */
577 struct task_cputime cputime_expires;
578
579 struct list_head cpu_timers[3];
580
ab521dc0 581 struct pid *tty_old_pgrp;
1ec320af 582
1da177e4
LT		 583 /* boolean value for session group leader */
584 int leader;
585
586 struct tty_struct *tty; /* NULL if no tty */
587
588 /*
589 * Cumulative resource counters for dead threads in the group,
590 * and for reaped dead child processes forked by this group.
591 * Live threads maintain their own counters and add to these
592 * in __exit_signal, except for the group leader.
593 */
32bd671d 594 cputime_t utime, stime, cutime, cstime;
9ac52315
LV		 595 cputime_t gtime;
596 cputime_t cgtime;
0cf55e1e
HS		 597#ifndef CONFIG_VIRT_CPU_ACCOUNTING
598 cputime_t prev_utime, prev_stime;
599#endif
1da177e4
LT		 600 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
601 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
6eaeeaba 602 unsigned long inblock, oublock, cinblock, coublock;
1f10206c 603 unsigned long maxrss, cmaxrss;
940389b8 604 struct task_io_accounting ioac;
1da177e4 605
32bd671d
PZ		 606 /*
607 * Cumulative ns of schedule CPU time fo dead threads in the
608 * group, not including a zombie group leader, (This only differs
609 * from jiffies_to_ns(utime + stime) if sched_clock uses something
610 * other than jiffies.)
611 */
612 unsigned long long sum_sched_runtime;
613
1da177e4
LT		 614 /*
615 * We don't bother to synchronize most readers of this at all,
616 * because there is no reader checking a limit that actually needs
617 * to get both rlim_cur and rlim_max atomically, and either one
618 * alone is a single word that can safely be read normally.
619 * getrlimit/setrlimit use task_lock(current->group_leader) to
620 * protect this instead of the siglock, because they really
621 * have no need to disable irqs.
622 */
623 struct rlimit rlim[RLIM_NLIMITS];
624
0e464814
KK		 625#ifdef CONFIG_BSD_PROCESS_ACCT
626 struct pacct_struct pacct; /* per-process accounting information */
627#endif
ad4ecbcb 628#ifdef CONFIG_TASKSTATS
ad4ecbcb
SN		 629 struct taskstats *stats;
630#endif
522ed776
MT		 631#ifdef CONFIG_AUDIT
632 unsigned audit_tty;
633 struct tty_audit_buf *tty_audit_buf;
634#endif
28b83c51
KM		 635
636 int oom_adj; /* OOM kill score adjustment (bit shift) */
1da177e4
LT		 637};
638
4866cde0
NP		 639/* Context switch must be unlocked if interrupts are to be enabled */
640#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
641# define __ARCH_WANT_UNLOCKED_CTXSW
642#endif
643
1da177e4
LT		 644/*
645 * Bits in flags field of signal_struct.
646 */
647#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
648#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
649#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
650#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
e4420551
ON		 651/*
652 * Pending notifications to parent.
653 */
654#define SIGNAL_CLD_STOPPED 0x00000010
655#define SIGNAL_CLD_CONTINUED 0x00000020
656#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
1da177e4 657
fae5fa44
ON		 658#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
659
ed5d2cac
ON		 660/* If true, all threads except ->group_exit_task have pending SIGKILL */
661static inline int signal_group_exit(const struct signal_struct *sig)
662{
663 return (sig->flags & SIGNAL_GROUP_EXIT) ||
664 (sig->group_exit_task != NULL);
665}
666
1da177e4
LT		 667/*
668 * Some day this will be a full-fledged user tracking system..
669 */
670struct user_struct {
671 atomic_t __count; /* reference count */
672 atomic_t processes; /* How many processes does this user have? */
673 atomic_t files; /* How many open files does this user have? */
674 atomic_t sigpending; /* How many pending signals does this user have? */
2d9048e2 675#ifdef CONFIG_INOTIFY_USER
0eeca283
RL		 676 atomic_t inotify_watches; /* How many inotify watches does this user have? */
677 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
678#endif
7ef9964e 679#ifdef CONFIG_EPOLL
7ef9964e
DL		 680 atomic_t epoll_watches; /* The number of file descriptors currently watched */
681#endif
970a8645 682#ifdef CONFIG_POSIX_MQUEUE
1da177e4
LT		 683 /* protected by mq_lock */
684 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
970a8645 685#endif
1da177e4
LT		 686 unsigned long locked_shm; /* How many pages of mlocked shm ? */
687
688#ifdef CONFIG_KEYS
689 struct key *uid_keyring; /* UID specific keyring */
690 struct key *session_keyring; /* UID's default session keyring */
691#endif
692
693 /* Hash table maintenance information */
735de223 694 struct hlist_node uidhash_node;
1da177e4 695 uid_t uid;
18b6e041 696 struct user_namespace *user_ns;
24e377a8 697
cdd6c482 698#ifdef CONFIG_PERF_EVENTS
789f90fc
PZ		 699 atomic_long_t locked_vm;
700#endif
1da177e4
LT		 701};
702
eb41d946 703extern int uids_sysfs_init(void);
5cb350ba 704
1da177e4
LT		 705extern struct user_struct *find_user(uid_t);
706
707extern struct user_struct root_user;
708#define INIT_USER (&root_user)
709
b6dff3ec 710
1da177e4
LT		 711struct backing_dev_info;
712struct reclaim_state;
713
52f17b6c 714#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 715struct sched_info {
716 /* cumulative counters */
2d72376b 717 unsigned long pcount; /* # of times run on this cpu */
9c2c4802 718 unsigned long long run_delay; /* time spent waiting on a runqueue */
1da177e4
LT		 719
720 /* timestamps */
172ba844
BS		 721 unsigned long long last_arrival,/* when we last ran on a cpu */
722 last_queued; /* when we were last queued to run */
b8efb561
IM		 723#ifdef CONFIG_SCHEDSTATS
724 /* BKL stats */
480b9434 725 unsigned int bkl_count;
b8efb561 726#endif
1da177e4 727};
52f17b6c 728#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
1da177e4 729
ca74e92b
SN		 730#ifdef CONFIG_TASK_DELAY_ACCT
731struct task_delay_info {
732 spinlock_t lock;
733 unsigned int flags; /* Private per-task flags */
734
735 /* For each stat XXX, add following, aligned appropriately
736 *
737 * struct timespec XXX_start, XXX_end;
738 * u64 XXX_delay;
739 * u32 XXX_count;
740 *
741 * Atomicity of updates to XXX_delay, XXX_count protected by
742 * single lock above (split into XXX_lock if contention is an issue).
743 */
0ff92245
SN		 744
745 /*
746 * XXX_count is incremented on every XXX operation, the delay
747 * associated with the operation is added to XXX_delay.
748 * XXX_delay contains the accumulated delay time in nanoseconds.
749 */
750 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
751 u64 blkio_delay; /* wait for sync block io completion */
752 u64 swapin_delay; /* wait for swapin block io completion */
753 u32 blkio_count; /* total count of the number of sync block */
754 /* io operations performed */
755 u32 swapin_count; /* total count of the number of swapin block */
756 /* io operations performed */
873b4771
KK		 757
758 struct timespec freepages_start, freepages_end;
759 u64 freepages_delay; /* wait for memory reclaim */
760 u32 freepages_count; /* total count of memory reclaim */
ca74e92b 761};
52f17b6c
CS		 762#endif /* CONFIG_TASK_DELAY_ACCT */
763
764static inline int sched_info_on(void)
765{
766#ifdef CONFIG_SCHEDSTATS
767 return 1;
768#elif defined(CONFIG_TASK_DELAY_ACCT)
769 extern int delayacct_on;
770 return delayacct_on;
771#else
772 return 0;
ca74e92b 773#endif
52f17b6c 774}
ca74e92b 775
d15bcfdb
IM		 776enum cpu_idle_type {
777 CPU_IDLE,
778 CPU_NOT_IDLE,
779 CPU_NEWLY_IDLE,
780 CPU_MAX_IDLE_TYPES
1da177e4
LT		 781};
782
783/*
784 * sched-domains (multiprocessor balancing) declarations:
785 */
9aa7b369
IM		 786
787/*
788 * Increase resolution of nice-level calculations:
789 */
790#define SCHED_LOAD_SHIFT 10
791#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
792
f8700df7 793#define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE
1da177e4 794
2dd73a4f 795#ifdef CONFIG_SMP
b5d978e0
PZ		 796#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
797#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
798#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
799#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
c88d5910 800#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
b5d978e0 801#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
59abf026 802#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
b5d978e0
PZ		 803#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
804#define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */
805#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
806#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
c88d5910 807
b5d978e0 808#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
5c45bf27 809
afb8a9b7
GS		 810enum powersavings_balance_level {
811 POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */
812 POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package
813 * first for long running threads
814 */
815 POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle
816 * cpu package for power savings
817 */
818 MAX_POWERSAVINGS_BALANCE_LEVELS
819};
89c4710e 820
716707b2 821extern int sched_mc_power_savings, sched_smt_power_savings;
89c4710e 822
716707b2
VS		 823static inline int sd_balance_for_mc_power(void)
824{
825 if (sched_smt_power_savings)
826 return SD_POWERSAVINGS_BALANCE;
5c45bf27 827
28f53181
VS		 828 if (!sched_mc_power_savings)
829 return SD_PREFER_SIBLING;
830
831 return 0;
716707b2 832}
89c4710e 833
716707b2
VS		 834static inline int sd_balance_for_package_power(void)
835{
836 if (sched_mc_power_savings | sched_smt_power_savings)
837 return SD_POWERSAVINGS_BALANCE;
838
b5d978e0 839 return SD_PREFER_SIBLING;
716707b2 840}
5c45bf27 841
100fdaee
VS		 842/*
843 * Optimise SD flags for power savings:
844 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
845 * Keep default SD flags if sched_{smt,mc}_power_saving=0
846 */
847
848static inline int sd_power_saving_flags(void)
849{
850 if (sched_mc_power_savings | sched_smt_power_savings)
851 return SD_BALANCE_NEWIDLE;
852
853 return 0;
854}
1da177e4
LT		 855
856struct sched_group {
857 struct sched_group *next; /* Must be a circular list */
1da177e4
LT		 858
859 /*
860 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
18a3885f 861 * single CPU.
5517d86b 862 */
18a3885f 863 unsigned int cpu_power;
6c99e9ad 864
4200efd9
IM		 865 /*
866 * The CPUs this group covers.
867 *
868 * NOTE: this field is variable length. (Allocated dynamically
869 * by attaching extra space to the end of the structure,
870 * depending on how many CPUs the kernel has booted up with)
871 *
872 * It is also be embedded into static data structures at build
873 * time. (See 'struct static_sched_group' in kernel/sched.c)
874 */
875 unsigned long cpumask[0];
1da177e4
LT		 876};
877
758b2cdc
RR		 878static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
879{
6c99e9ad 880 return to_cpumask(sg->cpumask);
758b2cdc
RR		 881}
882
1d3504fc
HS		 883enum sched_domain_level {
884 SD_LV_NONE = 0,
885 SD_LV_SIBLING,
886 SD_LV_MC,
887 SD_LV_CPU,
888 SD_LV_NODE,
889 SD_LV_ALLNODES,
890 SD_LV_MAX
891};
892
893struct sched_domain_attr {
894 int relax_domain_level;
895};
896
897#define SD_ATTR_INIT (struct sched_domain_attr) { \
898 .relax_domain_level = -1, \
899}
900
1da177e4
LT		 901struct sched_domain {
902 /* These fields must be setup */
903 struct sched_domain *parent; /* top domain must be null terminated */
1a848870 904 struct sched_domain *child; /* bottom domain must be null terminated */
1da177e4 905 struct sched_group *groups; /* the balancing groups of the domain */
1da177e4
LT		 906 unsigned long min_interval; /* Minimum balance interval ms */
907 unsigned long max_interval; /* Maximum balance interval ms */
908 unsigned int busy_factor; /* less balancing by factor if busy */
909 unsigned int imbalance_pct; /* No balance until over watermark */
1da177e4 910 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
7897986b
NP		 911 unsigned int busy_idx;
912 unsigned int idle_idx;
913 unsigned int newidle_idx;
914 unsigned int wake_idx;
147cbb4b 915 unsigned int forkexec_idx;
a52bfd73 916 unsigned int smt_gain;
1da177e4 917 int flags; /* See SD_* */
1d3504fc 918 enum sched_domain_level level;
1da177e4
LT		 919
920 /* Runtime fields. */
921 unsigned long last_balance; /* init to jiffies. units in jiffies */
922 unsigned int balance_interval; /* initialise to 1. units in ms. */
923 unsigned int nr_balance_failed; /* initialise to 0 */
924
2398f2c6
PZ		 925 u64 last_update;
926
1da177e4
LT		 927#ifdef CONFIG_SCHEDSTATS
928 /* load_balance() stats */
480b9434
KC		 929 unsigned int lb_count[CPU_MAX_IDLE_TYPES];
930 unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
931 unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
932 unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
933 unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
934 unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
935 unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
936 unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
1da177e4
LT		 937
938 /* Active load balancing */
480b9434
KC		 939 unsigned int alb_count;
940 unsigned int alb_failed;
941 unsigned int alb_pushed;
1da177e4 942
68767a0a 943 /* SD_BALANCE_EXEC stats */
480b9434
KC		 944 unsigned int sbe_count;
945 unsigned int sbe_balanced;
946 unsigned int sbe_pushed;
1da177e4 947
68767a0a 948 /* SD_BALANCE_FORK stats */
480b9434
KC		 949 unsigned int sbf_count;
950 unsigned int sbf_balanced;
951 unsigned int sbf_pushed;
68767a0a 952
1da177e4 953 /* try_to_wake_up() stats */
480b9434
KC		 954 unsigned int ttwu_wake_remote;
955 unsigned int ttwu_move_affine;
956 unsigned int ttwu_move_balance;
1da177e4 957#endif
a5d8c348
IM		 958#ifdef CONFIG_SCHED_DEBUG
959 char *name;
960#endif
6c99e9ad 961
669c55e9 962 unsigned int span_weight;
4200efd9
IM		 963 /*
964 * Span of all CPUs in this domain.
965 *
966 * NOTE: this field is variable length. (Allocated dynamically
967 * by attaching extra space to the end of the structure,
968 * depending on how many CPUs the kernel has booted up with)
969 *
970 * It is also be embedded into static data structures at build
971 * time. (See 'struct static_sched_domain' in kernel/sched.c)
972 */
973 unsigned long span[0];
1da177e4
LT		 974};
975
758b2cdc
RR		 976static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
977{
6c99e9ad 978 return to_cpumask(sd->span);
758b2cdc
RR		 979}
980
acc3f5d7 981extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1d3504fc 982 struct sched_domain_attr *dattr_new);
029190c5 983
acc3f5d7
RR		 984/* Allocate an array of sched domains, for partition_sched_domains(). */
985cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
986void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
987
06aaf76a
IM		 988/* Test a flag in parent sched domain */
989static inline int test_sd_parent(struct sched_domain *sd, int flag)
990{
991 if (sd->parent && (sd->parent->flags & flag))
992 return 1;
993
994 return 0;
995}
029190c5 996
47fe38fc
PZ		 997unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
998unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
999
1b427c15 1000#else /* CONFIG_SMP */
1da177e4 1001
1b427c15 1002struct sched_domain_attr;
d02c7a8c 1003
1b427c15 1004static inline void
acc3f5d7 1005partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1b427c15
IM		 1006 struct sched_domain_attr *dattr_new)
1007{
d02c7a8c 1008}
1b427c15 1009#endif /* !CONFIG_SMP */
1da177e4 1010
47fe38fc 1011
1da177e4 1012struct io_context; /* See blkdev.h */
1da177e4 1013
1da177e4 1014
383f2835 1015#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
36c8b586 1016extern void prefetch_stack(struct task_struct *t);
383f2835
KC		 1017#else
1018static inline void prefetch_stack(struct task_struct *t) { }
1019#endif
1da177e4
LT		 1020
1021struct audit_context; /* See audit.c */
1022struct mempolicy;
b92ce558 1023struct pipe_inode_info;
4865ecf1 1024struct uts_namespace;
1da177e4 1025
20b8a59f
IM		 1026struct rq;
1027struct sched_domain;
1028
7d478721
PZ		 1029/*
1030 * wake flags
1031 */
1032#define WF_SYNC 0x01 /* waker goes to sleep after wakup */
a7558e01 1033#define WF_FORK 0x02 /* child wakeup after fork */
7d478721 1034
371fd7e7
PZ		 1035#define ENQUEUE_WAKEUP 1
1036#define ENQUEUE_WAKING 2
1037#define ENQUEUE_HEAD 4
1038
1039#define DEQUEUE_SLEEP 1
1040
20b8a59f 1041struct sched_class {
5522d5d5 1042 const struct sched_class *next;
20b8a59f 1043
371fd7e7
PZ		 1044 void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1045 void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
4530d7ab 1046 void (*yield_task) (struct rq *rq);
20b8a59f 1047
7d478721 1048 void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
20b8a59f 1049
fb8d4724 1050 struct task_struct * (*pick_next_task) (struct rq *rq);
31ee529c 1051 void (*put_prev_task) (struct rq *rq, struct task_struct *p);
20b8a59f 1052
681f3e68 1053#ifdef CONFIG_SMP
0017d735
PZ		 1054 int (*select_task_rq)(struct rq *rq, struct task_struct *p,
1055 int sd_flag, int flags);
4ce72a2c 1056
9a897c5a
SR		 1057 void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1058 void (*post_schedule) (struct rq *this_rq);
efbbd05a
PZ		 1059 void (*task_waking) (struct rq *this_rq, struct task_struct *task);
1060 void (*task_woken) (struct rq *this_rq, struct task_struct *task);
e1d1484f 1061
cd8ba7cd 1062 void (*set_cpus_allowed)(struct task_struct *p,
96f874e2 1063 const struct cpumask *newmask);
57d885fe 1064
1f11eb6a
GH		 1065 void (*rq_online)(struct rq *rq);
1066 void (*rq_offline)(struct rq *rq);
4ce72a2c
LZ		 1067#endif
1068
1069 void (*set_curr_task) (struct rq *rq);
1070 void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
cd29fe6f 1071 void (*task_fork) (struct task_struct *p);
cb469845
SR		 1072
1073 void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1074 int running);
1075 void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1076 int running);
1077 void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1078 int oldprio, int running);
810b3817 1079
dba091b9
TG		 1080 unsigned int (*get_rr_interval) (struct rq *rq,
1081 struct task_struct *task);
0d721cea 1082
810b3817 1083#ifdef CONFIG_FAIR_GROUP_SCHED
88ec22d3 1084 void (*moved_group) (struct task_struct *p, int on_rq);
810b3817 1085#endif
20b8a59f
IM		 1086};
1087
1088struct load_weight {
1089 unsigned long weight, inv_weight;
1090};
1091
94c18227 1092#ifdef CONFIG_SCHEDSTATS
41acab88 1093struct sched_statistics {
20b8a59f 1094 u64 wait_start;
94c18227 1095 u64 wait_max;
6d082592
AV		 1096 u64 wait_count;
1097 u64 wait_sum;
8f0dfc34
AV		 1098 u64 iowait_count;
1099 u64 iowait_sum;
94c18227 1100
20b8a59f 1101 u64 sleep_start;
20b8a59f 1102 u64 sleep_max;
94c18227
IM		 1103 s64 sum_sleep_runtime;
1104
1105 u64 block_start;
20b8a59f
IM		 1106 u64 block_max;
1107 u64 exec_max;
eba1ed4b 1108 u64 slice_max;
cc367732 1109
cc367732
IM		 1110 u64 nr_migrations_cold;
1111 u64 nr_failed_migrations_affine;
1112 u64 nr_failed_migrations_running;
1113 u64 nr_failed_migrations_hot;
1114 u64 nr_forced_migrations;
cc367732
IM		 1115
1116 u64 nr_wakeups;
1117 u64 nr_wakeups_sync;
1118 u64 nr_wakeups_migrate;
1119 u64 nr_wakeups_local;
1120 u64 nr_wakeups_remote;
1121 u64 nr_wakeups_affine;
1122 u64 nr_wakeups_affine_attempts;
1123 u64 nr_wakeups_passive;
1124 u64 nr_wakeups_idle;
41acab88
LDM		 1125};
1126#endif
1127
1128struct sched_entity {
1129 struct load_weight load; /* for load-balancing */
1130 struct rb_node run_node;
1131 struct list_head group_node;
1132 unsigned int on_rq;
1133
1134 u64 exec_start;
1135 u64 sum_exec_runtime;
1136 u64 vruntime;
1137 u64 prev_sum_exec_runtime;
1138
41acab88
LDM		 1139 u64 nr_migrations;
1140
41acab88
LDM		 1141#ifdef CONFIG_SCHEDSTATS
1142 struct sched_statistics statistics;
94c18227
IM		 1143#endif
1144
20b8a59f
IM		 1145#ifdef CONFIG_FAIR_GROUP_SCHED
1146 struct sched_entity *parent;
1147 /* rq on which this entity is (to be) queued: */
1148 struct cfs_rq *cfs_rq;
1149 /* rq "owned" by this entity/group: */
1150 struct cfs_rq *my_q;
1151#endif
1152};
70b97a7f 1153
fa717060
PZ		 1154struct sched_rt_entity {
1155 struct list_head run_list;
78f2c7db 1156 unsigned long timeout;
bee367ed 1157 unsigned int time_slice;
6f505b16
PZ		 1158 int nr_cpus_allowed;
1159
58d6c2d7 1160 struct sched_rt_entity *back;
052f1dc7 1161#ifdef CONFIG_RT_GROUP_SCHED
6f505b16
PZ		 1162 struct sched_rt_entity *parent;
1163 /* rq on which this entity is (to be) queued: */
1164 struct rt_rq *rt_rq;
1165 /* rq "owned" by this entity/group: */
1166 struct rt_rq *my_q;
1167#endif
fa717060
PZ		 1168};
1169
86848966
PM		 1170struct rcu_node;
1171
1da177e4
LT		 1172struct task_struct {
1173 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
f7e4217b 1174 void *stack;
1da177e4 1175 atomic_t usage;
97dc32cd
WC		 1176 unsigned int flags; /* per process flags, defined below */
1177 unsigned int ptrace;
1da177e4 1178
36772092 1179 int lock_depth; /* BKL lock depth */
1da177e4 1180
2dd73a4f
PW		 1181#ifdef CONFIG_SMP
1182#ifdef __ARCH_WANT_UNLOCKED_CTXSW
4866cde0
NP		 1183 int oncpu;
1184#endif
2dd73a4f 1185#endif
50e645a8 1186
b29739f9 1187 int prio, static_prio, normal_prio;
c7aceaba 1188 unsigned int rt_priority;
5522d5d5 1189 const struct sched_class *sched_class;
20b8a59f 1190 struct sched_entity se;
fa717060 1191 struct sched_rt_entity rt;
1da177e4 1192
e107be36
AK		 1193#ifdef CONFIG_PREEMPT_NOTIFIERS
1194 /* list of struct preempt_notifier: */
1195 struct hlist_head preempt_notifiers;
1196#endif
1197
18796aa0
AD		 1198 /*
1199 * fpu_counter contains the number of consecutive context switches
1200 * that the FPU is used. If this is over a threshold, the lazy fpu
1201 * saving becomes unlazy to save the trap. This is an unsigned char
1202 * so that after 256 times the counter wraps and the behavior turns
1203 * lazy again; this to deal with bursty apps that only use FPU for
1204 * a short time
1205 */
1206 unsigned char fpu_counter;
6c5c9341 1207#ifdef CONFIG_BLK_DEV_IO_TRACE
2056a782 1208 unsigned int btrace_seq;
6c5c9341 1209#endif
1da177e4 1210
97dc32cd 1211 unsigned int policy;
1da177e4 1212 cpumask_t cpus_allowed;
1da177e4 1213
f41d911f 1214#ifdef CONFIG_TREE_PREEMPT_RCU
e260be67 1215 int rcu_read_lock_nesting;
f41d911f 1216 char rcu_read_unlock_special;
86848966 1217 struct rcu_node *rcu_blocked_node;
f41d911f
PM		 1218 struct list_head rcu_node_entry;
1219#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
e260be67 1220
52f17b6c 1221#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1da177e4
LT		 1222 struct sched_info sched_info;
1223#endif
1224
1225 struct list_head tasks;
917b627d 1226 struct plist_node pushable_tasks;
1da177e4
LT		 1227
1228 struct mm_struct *mm, *active_mm;
34e55232
KH		 1229#if defined(SPLIT_RSS_COUNTING)
1230 struct task_rss_stat rss_stat;
1231#endif
1da177e4 1232/* task state */
97dc32cd 1233 int exit_state;
1da177e4
LT		 1234 int exit_code, exit_signal;
1235 int pdeath_signal; /* The signal sent when the parent dies */
1236 /* ??? */
97dc32cd 1237 unsigned int personality;
1da177e4 1238 unsigned did_exec:1;
f9ce1f1c
KT		 1239 unsigned in_execve:1; /* Tell the LSMs that the process is doing an
1240 * execve */
8f0dfc34
AV		 1241 unsigned in_iowait:1;
1242
ca94c442
LP		 1243
1244 /* Revert to default priority/policy when forking */
1245 unsigned sched_reset_on_fork:1;
1246
1da177e4
LT		 1247 pid_t pid;
1248 pid_t tgid;
0a425405 1249
1314562a 1250#ifdef CONFIG_CC_STACKPROTECTOR
0a425405
AV		 1251 /* Canary value for the -fstack-protector gcc feature */
1252 unsigned long stack_canary;
1314562a 1253#endif
e0032087 1254
1da177e4
LT		 1255 /*
1256 * pointers to (original) parent process, youngest child, younger sibling,
1257 * older sibling, respectively. (p->father can be replaced with
f470021a 1258 * p->real_parent->pid)
1da177e4 1259 */
f470021a
RM		 1260 struct task_struct *real_parent; /* real parent process */
1261 struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1da177e4 1262 /*
f470021a 1263 * children/sibling forms the list of my natural children
1da177e4
LT		 1264 */
1265 struct list_head children; /* list of my children */
1266 struct list_head sibling; /* linkage in my parent's children list */
1267 struct task_struct *group_leader; /* threadgroup leader */
1268
f470021a
RM		 1269 /*
1270 * ptraced is the list of tasks this task is using ptrace on.
1271 * This includes both natural children and PTRACE_ATTACH targets.
1272 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1273 */
1274 struct list_head ptraced;
1275 struct list_head ptrace_entry;
1276
1da177e4 1277 /* PID/PID hash table linkage. */
92476d7f 1278 struct pid_link pids[PIDTYPE_MAX];
47e65328 1279 struct list_head thread_group;
1da177e4
LT		 1280
1281 struct completion *vfork_done; /* for vfork() */
1282 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
1283 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
1284
c66f08be 1285 cputime_t utime, stime, utimescaled, stimescaled;
9ac52315 1286 cputime_t gtime;
d99ca3b9 1287#ifndef CONFIG_VIRT_CPU_ACCOUNTING
9301899b 1288 cputime_t prev_utime, prev_stime;
d99ca3b9 1289#endif
1da177e4 1290 unsigned long nvcsw, nivcsw; /* context switch counts */
924b42d5
TJ		 1291 struct timespec start_time; /* monotonic time */
1292 struct timespec real_start_time; /* boot based time */
1da177e4
LT		 1293/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1294 unsigned long min_flt, maj_flt;
1295
f06febc9 1296 struct task_cputime cputime_expires;
1da177e4
LT		 1297 struct list_head cpu_timers[3];
1298
1299/* process credentials */
3b11a1de
DH		 1300 const struct cred *real_cred; /* objective and real subjective task
1301 * credentials (COW) */
1302 const struct cred *cred; /* effective (overridable) subjective task
1303 * credentials (COW) */
5e751e99
DH		 1304 struct mutex cred_guard_mutex; /* guard against foreign influences on
1305 * credential calculations
1306 * (notably. ptrace) */
ee18d64c 1307 struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
b6dff3ec 1308
36772092
PBG		 1309 char comm[TASK_COMM_LEN]; /* executable name excluding path
1310 - access with [gs]et_task_comm (which lock
1311 it with task_lock())
221af7f8 1312 - initialized normally by setup_new_exec */
1da177e4
LT		 1313/* file system info */
1314 int link_count, total_link_count;
3d5b6fcc 1315#ifdef CONFIG_SYSVIPC
1da177e4
LT		 1316/* ipc stuff */
1317 struct sysv_sem sysvsem;
3d5b6fcc 1318#endif
e162b39a 1319#ifdef CONFIG_DETECT_HUNG_TASK
82a1fcb9 1320/* hung task detection */
82a1fcb9
IM		 1321 unsigned long last_switch_count;
1322#endif
1da177e4
LT		 1323/* CPU-specific state of this task */
1324 struct thread_struct thread;
1325/* filesystem information */
1326 struct fs_struct *fs;
1327/* open file information */
1328 struct files_struct *files;
1651e14e 1329/* namespaces */
ab516013 1330 struct nsproxy *nsproxy;
1da177e4
LT		 1331/* signal handlers */
1332 struct signal_struct *signal;
1333 struct sighand_struct *sighand;
1334
1335 sigset_t blocked, real_blocked;
f3de272b 1336 sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1da177e4
LT		 1337 struct sigpending pending;
1338
1339 unsigned long sas_ss_sp;
1340 size_t sas_ss_size;
1341 int (*notifier)(void *priv);
1342 void *notifier_data;
1343 sigset_t *notifier_mask;
1da177e4 1344 struct audit_context *audit_context;
bfef93a5
AV		 1345#ifdef CONFIG_AUDITSYSCALL
1346 uid_t loginuid;
4746ec5b 1347 unsigned int sessionid;
bfef93a5 1348#endif
1da177e4
LT		 1349 seccomp_t seccomp;
1350
1351/* Thread group tracking */
1352 u32 parent_exec_id;
1353 u32 self_exec_id;
58568d2a
MX		 1354/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1355 * mempolicy */
1da177e4 1356 spinlock_t alloc_lock;
1da177e4 1357
3aa551c9
TG		 1358#ifdef CONFIG_GENERIC_HARDIRQS
1359 /* IRQ handler threads */
1360 struct irqaction *irqaction;
1361#endif
1362
b29739f9 1363 /* Protection of the PI data structures: */
1d615482 1364 raw_spinlock_t pi_lock;
b29739f9 1365
23f78d4a
IM		 1366#ifdef CONFIG_RT_MUTEXES
1367 /* PI waiters blocked on a rt_mutex held by this task */
1368 struct plist_head pi_waiters;
1369 /* Deadlock detection and priority inheritance handling */
1370 struct rt_mutex_waiter *pi_blocked_on;
23f78d4a
IM		 1371#endif
1372
408894ee
IM		 1373#ifdef CONFIG_DEBUG_MUTEXES
1374 /* mutex deadlock detection */
1375 struct mutex_waiter *blocked_on;
1376#endif
de30a2b3
IM		 1377#ifdef CONFIG_TRACE_IRQFLAGS
1378 unsigned int irq_events;
de30a2b3 1379 unsigned long hardirq_enable_ip;
de30a2b3 1380 unsigned long hardirq_disable_ip;
fa1452e8 1381 unsigned int hardirq_enable_event;
de30a2b3 1382 unsigned int hardirq_disable_event;
fa1452e8
HS		 1383 int hardirqs_enabled;
1384 int hardirq_context;
de30a2b3 1385 unsigned long softirq_disable_ip;
de30a2b3 1386 unsigned long softirq_enable_ip;
fa1452e8 1387 unsigned int softirq_disable_event;
de30a2b3 1388 unsigned int softirq_enable_event;
fa1452e8 1389 int softirqs_enabled;
de30a2b3
IM		 1390 int softirq_context;
1391#endif
fbb9ce95 1392#ifdef CONFIG_LOCKDEP
bdb9441e 1393# define MAX_LOCK_DEPTH 48UL
fbb9ce95
IM		 1394 u64 curr_chain_key;
1395 int lockdep_depth;
fbb9ce95 1396 unsigned int lockdep_recursion;
c7aceaba 1397 struct held_lock held_locks[MAX_LOCK_DEPTH];
cf40bd16 1398 gfp_t lockdep_reclaim_gfp;
fbb9ce95 1399#endif
408894ee 1400
1da177e4
LT		 1401/* journalling filesystem info */
1402 void *journal_info;
1403
d89d8796 1404/* stacked block device info */
bddd87c7 1405 struct bio_list *bio_list;
d89d8796 1406
1da177e4
LT		 1407/* VM state */
1408 struct reclaim_state *reclaim_state;
1409
1da177e4
LT		 1410 struct backing_dev_info *backing_dev_info;
1411
1412 struct io_context *io_context;
1413
1414 unsigned long ptrace_message;
1415 siginfo_t *last_siginfo; /* For ptrace use. */
7c3ab738 1416 struct task_io_accounting ioac;
8f0ab514 1417#if defined(CONFIG_TASK_XACCT)
1da177e4
LT		 1418 u64 acct_rss_mem1; /* accumulated rss usage */
1419 u64 acct_vm_mem1; /* accumulated virtual memory usage */
49b5cf34 1420 cputime_t acct_timexpd; /* stime + utime since last update */
1da177e4
LT		 1421#endif
1422#ifdef CONFIG_CPUSETS
58568d2a 1423 nodemask_t mems_allowed; /* Protected by alloc_lock */
c0ff7453 1424 int mems_allowed_change_disable;
825a46af 1425 int cpuset_mem_spread_rotor;
6adef3eb 1426 int cpuset_slab_spread_rotor;
1da177e4 1427#endif
ddbcc7e8 1428#ifdef CONFIG_CGROUPS
817929ec
PM		 1429 /* Control Group info protected by css_set_lock */
1430 struct css_set *cgroups;
1431 /* cg_list protected by css_set_lock and tsk->alloc_lock */
1432 struct list_head cg_list;
ddbcc7e8 1433#endif
42b2dd0a 1434#ifdef CONFIG_FUTEX
0771dfef 1435 struct robust_list_head __user *robust_list;
34f192c6
IM		 1436#ifdef CONFIG_COMPAT
1437 struct compat_robust_list_head __user *compat_robust_list;
1438#endif
c87e2837
IM		 1439 struct list_head pi_state_list;
1440 struct futex_pi_state *pi_state_cache;
c7aceaba 1441#endif
cdd6c482
IM		 1442#ifdef CONFIG_PERF_EVENTS
1443 struct perf_event_context *perf_event_ctxp;
1444 struct mutex perf_event_mutex;
1445 struct list_head perf_event_list;
a63eaf34 1446#endif
c7aceaba 1447#ifdef CONFIG_NUMA
58568d2a 1448 struct mempolicy *mempolicy; /* Protected by alloc_lock */
c7aceaba 1449 short il_next;
42b2dd0a 1450#endif
22e2c507 1451 atomic_t fs_excl; /* holding fs exclusive resources */
e56d0903 1452 struct rcu_head rcu;
b92ce558
JA		 1453
1454 /*
1455 * cache last used pipe for splice
1456 */
1457 struct pipe_inode_info *splice_pipe;
ca74e92b
SN		 1458#ifdef CONFIG_TASK_DELAY_ACCT
1459 struct task_delay_info *delays;
f4f154fd
AM		 1460#endif
1461#ifdef CONFIG_FAULT_INJECTION
1462 int make_it_fail;
ca74e92b 1463#endif
3e26c149 1464 struct prop_local_single dirties;
9745512c
AV		 1465#ifdef CONFIG_LATENCYTOP
1466 int latency_record_count;
1467 struct latency_record latency_record[LT_SAVECOUNT];
1468#endif
6976675d
AV		 1469 /*
1470 * time slack values; these are used to round up poll() and
1471 * select() etc timeout values. These are in nanoseconds.
1472 */
1473 unsigned long timer_slack_ns;
1474 unsigned long default_timer_slack_ns;
f8d570a4
DM		 1475
1476 struct list_head *scm_work_list;
fb52607a 1477#ifdef CONFIG_FUNCTION_GRAPH_TRACER
3ad2f3fb 1478 /* Index of current stored address in ret_stack */
f201ae23
FW		 1479 int curr_ret_stack;
1480 /* Stack of return addresses for return function tracing */
1481 struct ftrace_ret_stack *ret_stack;
8aef2d28
SR		 1482 /* time stamp for last schedule */
1483 unsigned long long ftrace_timestamp;
f201ae23
FW		 1484 /*
1485 * Number of functions that haven't been traced
1486 * because of depth overrun.
1487 */
1488 atomic_t trace_overrun;
380c4b14
FW		 1489 /* Pause for the tracing */
1490 atomic_t tracing_graph_pause;
f201ae23 1491#endif
ea4e2bc4
SR		 1492#ifdef CONFIG_TRACING
1493 /* state flags for use by tracers */
1494 unsigned long trace;
261842b7
SR		 1495 /* bitmask of trace recursion */
1496 unsigned long trace_recursion;
1497#endif /* CONFIG_TRACING */
569b846d
KH		 1498#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1499 struct memcg_batch_info {
1500 int do_batch; /* incremented when batch uncharge started */
1501 struct mem_cgroup *memcg; /* target memcg of uncharge */
1502 unsigned long bytes; /* uncharged usage */
1503 unsigned long memsw_bytes; /* uncharged mem+swap usage */
1504 } memcg_batch;
1505#endif
1da177e4
LT		 1506};
1507
76e6eee0 1508/* Future-safe accessor for struct task_struct's cpus_allowed. */
a4636818 1509#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
76e6eee0 1510
e05606d3
IM		 1511/*
1512 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1513 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1514 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1515 * values are inverted: lower p->prio value means higher priority.
1516 *
1517 * The MAX_USER_RT_PRIO value allows the actual maximum
1518 * RT priority to be separate from the value exported to
1519 * user-space. This allows kernel threads to set their
1520 * priority to a value higher than any user task. Note:
1521 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1522 */
1523
1524#define MAX_USER_RT_PRIO 100
1525#define MAX_RT_PRIO MAX_USER_RT_PRIO
1526
1527#define MAX_PRIO (MAX_RT_PRIO + 40)
1528#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
1529
1530static inline int rt_prio(int prio)
1531{
1532 if (unlikely(prio < MAX_RT_PRIO))
1533 return 1;
1534 return 0;
1535}
1536
e868171a 1537static inline int rt_task(struct task_struct *p)
e05606d3
IM		 1538{
1539 return rt_prio(p->prio);
1540}
1541
e868171a 1542static inline struct pid *task_pid(struct task_struct *task)
22c935f4
EB		 1543{
1544 return task->pids[PIDTYPE_PID].pid;
1545}
1546
e868171a 1547static inline struct pid *task_tgid(struct task_struct *task)
22c935f4
EB		 1548{
1549 return task->group_leader->pids[PIDTYPE_PID].pid;
1550}
1551
6dda81f4
ON		 1552/*
1553 * Without tasklist or rcu lock it is not safe to dereference
1554 * the result of task_pgrp/task_session even if task == current,
1555 * we can race with another thread doing sys_setsid/sys_setpgid.
1556 */
e868171a 1557static inline struct pid *task_pgrp(struct task_struct *task)
22c935f4
EB		 1558{
1559 return task->group_leader->pids[PIDTYPE_PGID].pid;
1560}
1561
e868171a 1562static inline struct pid *task_session(struct task_struct *task)
22c935f4
EB		 1563{
1564 return task->group_leader->pids[PIDTYPE_SID].pid;
1565}
1566
7af57294
PE		 1567struct pid_namespace;
1568
1569/*
1570 * the helpers to get the task's different pids as they are seen
1571 * from various namespaces
1572 *
1573 * task_xid_nr() : global id, i.e. the id seen from the init namespace;
44c4e1b2
EB		 1574 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
1575 * current.
7af57294
PE		 1576 * task_xid_nr_ns() : id seen from the ns specified;
1577 *
1578 * set_task_vxid() : assigns a virtual id to a task;
1579 *
7af57294
PE		 1580 * see also pid_nr() etc in include/linux/pid.h
1581 */
52ee2dfd
ON		 1582pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1583 struct pid_namespace *ns);
7af57294 1584
e868171a 1585static inline pid_t task_pid_nr(struct task_struct *tsk)
7af57294
PE		 1586{
1587 return tsk->pid;
1588}
1589
52ee2dfd
ON		 1590static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1591 struct pid_namespace *ns)
1592{
1593 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1594}
7af57294
PE		 1595
1596static inline pid_t task_pid_vnr(struct task_struct *tsk)
1597{
52ee2dfd 1598 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
7af57294
PE		 1599}
1600
1601
e868171a 1602static inline pid_t task_tgid_nr(struct task_struct *tsk)
7af57294
PE		 1603{
1604 return tsk->tgid;
1605}
1606
2f2a3a46 1607pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
7af57294
PE		 1608
1609static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1610{
1611 return pid_vnr(task_tgid(tsk));
1612}
1613
1614
52ee2dfd
ON		 1615static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1616 struct pid_namespace *ns)
7af57294 1617{
52ee2dfd 1618 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
7af57294
PE		 1619}
1620
7af57294
PE		 1621static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1622{
52ee2dfd 1623 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
7af57294
PE		 1624}
1625
1626
52ee2dfd
ON		 1627static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1628 struct pid_namespace *ns)
7af57294 1629{
52ee2dfd 1630 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
7af57294
PE		 1631}
1632
7af57294
PE		 1633static inline pid_t task_session_vnr(struct task_struct *tsk)
1634{
52ee2dfd 1635 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
7af57294
PE		 1636}
1637
1b0f7ffd
ON		 1638/* obsolete, do not use */
1639static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1640{
1641 return task_pgrp_nr_ns(tsk, &init_pid_ns);
1642}
7af57294 1643
1da177e4
LT		 1644/**
1645 * pid_alive - check that a task structure is not stale
1646 * @p: Task structure to be checked.
1647 *
1648 * Test if a process is not yet dead (at most zombie state)
1649 * If pid_alive fails, then pointers within the task structure
1650 * can be stale and must not be dereferenced.
1651 */
e868171a 1652static inline int pid_alive(struct task_struct *p)
1da177e4 1653{
92476d7f 1654 return p->pids[PIDTYPE_PID].pid != NULL;
1da177e4
LT		 1655}
1656
f400e198 1657/**
b460cbc5 1658 * is_global_init - check if a task structure is init
3260259f
HK		 1659 * @tsk: Task structure to be checked.
1660 *
1661 * Check if a task structure is the first user space task the kernel created.
b460cbc5 1662 */
e868171a 1663static inline int is_global_init(struct task_struct *tsk)
b461cc03
PE		 1664{
1665 return tsk->pid == 1;
1666}
b460cbc5
SH		 1667
1668/*
1669 * is_container_init:
1670 * check whether in the task is init in its own pid namespace.
f400e198 1671 */
b461cc03 1672extern int is_container_init(struct task_struct *tsk);
f400e198 1673
9ec52099
CLG		 1674extern struct pid *cad_pid;
1675
1da177e4 1676extern void free_task(struct task_struct *tsk);
1da177e4 1677#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
e56d0903 1678
158d9ebd 1679extern void __put_task_struct(struct task_struct *t);
e56d0903
IM		 1680
1681static inline void put_task_struct(struct task_struct *t)
1682{
1683 if (atomic_dec_and_test(&t->usage))
8c7904a0 1684 __put_task_struct(t);
e56d0903 1685}
1da177e4 1686
d180c5bc 1687extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
0cf55e1e 1688extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
49048622 1689
1da177e4
LT		 1690/*
1691 * Per process flags
1692 */
1693#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1694 /* Not implemented yet, only for 486*/
1695#define PF_STARTING 0x00000002 /* being created */
1696#define PF_EXITING 0x00000004 /* getting shut down */
778e9a9c 1697#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
94886b84 1698#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
1da177e4 1699#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
4db96cf0 1700#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
1da177e4
LT		 1701#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1702#define PF_DUMPCORE 0x00000200 /* dumped core */
1703#define PF_SIGNALED 0x00000400 /* killed by a signal */
1704#define PF_MEMALLOC 0x00000800 /* Allocating memory */
1705#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1706#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
6301cb95 1707#define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */
1da177e4
LT		 1708#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1709#define PF_FROZEN 0x00010000 /* frozen for system suspend */
1710#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1711#define PF_KSWAPD 0x00040000 /* I am kswapd */
35451bee 1712#define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
1da177e4 1713#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
246bb0b1 1714#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
b31dc66a
JA		 1715#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1716#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1717#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1718#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
9985b0ba 1719#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
4db96cf0 1720#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
c61afb18 1721#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
61a87122 1722#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
ba96a0c8 1723#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
ebb12db5 1724#define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
1da177e4
LT		 1725
1726/*
1727 * Only the _current_ task can read/write to tsk->flags, but other
1728 * tasks can access tsk->flags in readonly mode for example
1729 * with tsk_used_math (like during threaded core dumping).
1730 * There is however an exception to this rule during ptrace
1731 * or during fork: the ptracer task is allowed to write to the
1732 * child->flags of its traced child (same goes for fork, the parent
1733 * can write to the child->flags), because we're guaranteed the
1734 * child is not running and in turn not changing child->flags
1735 * at the same time the parent does it.
1736 */
1737#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1738#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1739#define clear_used_math() clear_stopped_child_used_math(current)
1740#define set_used_math() set_stopped_child_used_math(current)
1741#define conditional_stopped_child_used_math(condition, child) \
1742 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1743#define conditional_used_math(condition) \
1744 conditional_stopped_child_used_math(condition, current)
1745#define copy_to_stopped_child_used_math(child) \
1746 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
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
f41d911f
PM		 1751#ifdef CONFIG_TREE_PREEMPT_RCU
1752
1753#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1754#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
f41d911f
PM		 1755
1756static inline void rcu_copy_process(struct task_struct *p)
1757{
1758 p->rcu_read_lock_nesting = 0;
1759 p->rcu_read_unlock_special = 0;
dd5d19ba 1760 p->rcu_blocked_node = NULL;
f41d911f
PM		 1761 INIT_LIST_HEAD(&p->rcu_node_entry);
1762}
1763
f41d911f
PM		 1764#else
1765
1766static inline void rcu_copy_process(struct task_struct *p)
1767{
1768}
1769
1770#endif
1771
1da177e4 1772#ifdef CONFIG_SMP
cd8ba7cd 1773extern int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1774 const struct cpumask *new_mask);
1da177e4 1775#else
cd8ba7cd 1776static inline int set_cpus_allowed_ptr(struct task_struct *p,
96f874e2 1777 const struct cpumask *new_mask)
1da177e4 1778{
96f874e2 1779 if (!cpumask_test_cpu(0, new_mask))
1da177e4
LT		 1780 return -EINVAL;
1781 return 0;
1782}
1783#endif
e0ad9556
RR		 1784
1785#ifndef CONFIG_CPUMASK_OFFSTACK
cd8ba7cd
MT		 1786static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1787{
1788 return set_cpus_allowed_ptr(p, &new_mask);
1789}
e0ad9556 1790#endif
1da177e4 1791
b342501c
IM		 1792/*
1793 * Architectures can set this to 1 if they have specified
1794 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1795 * but then during bootup it turns out that sched_clock()
1796 * is reliable after all:
1797 */
1798#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1799extern int sched_clock_stable;
1800#endif
1801
1bbfa6f2
MF		 1802/* ftrace calls sched_clock() directly */
1803extern unsigned long long notrace sched_clock(void);
e436d800 1804
c1955a3d
PZ		 1805extern void sched_clock_init(void);
1806extern u64 sched_clock_cpu(int cpu);
3e51f33f 1807
c1955a3d 1808#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
3e51f33f
PZ		 1809static inline void sched_clock_tick(void)
1810{
1811}
1812
1813static inline void sched_clock_idle_sleep_event(void)
1814{
1815}
1816
1817static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1818{
1819}
1820#else
3e51f33f
PZ		 1821extern void sched_clock_tick(void);
1822extern void sched_clock_idle_sleep_event(void);
1823extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1824#endif
1825
e436d800
IM		 1826/*
1827 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1828 * clock constructed from sched_clock():
1829 */
1830extern unsigned long long cpu_clock(int cpu);
1831
36c8b586 1832extern unsigned long long
41b86e9c 1833task_sched_runtime(struct task_struct *task);
f06febc9 1834extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1da177e4
LT		 1835
1836/* sched_exec is called by processes performing an exec */
1837#ifdef CONFIG_SMP
1838extern void sched_exec(void);
1839#else
1840#define sched_exec() {}
1841#endif
1842
2aa44d05
IM		 1843extern void sched_clock_idle_sleep_event(void);
1844extern void sched_clock_idle_wakeup_event(u64 delta_ns);
bb29ab26 1845
1da177e4 1846#ifdef CONFIG_HOTPLUG_CPU
6a1bdc1b 1847extern void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p);
1da177e4
LT		 1848extern void idle_task_exit(void);
1849#else
1850static inline void idle_task_exit(void) {}
1851#endif
1852
1853extern void sched_idle_next(void);
b29739f9 1854
06d8308c
TG		 1855#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1856extern void wake_up_idle_cpu(int cpu);
1857#else
1858static inline void wake_up_idle_cpu(int cpu) { }
1859#endif
1860
21805085 1861extern unsigned int sysctl_sched_latency;
b2be5e96 1862extern unsigned int sysctl_sched_min_granularity;
bf0f6f24 1863extern unsigned int sysctl_sched_wakeup_granularity;
47fea2ad
JSR		 1864extern unsigned int sysctl_sched_shares_ratelimit;
1865extern unsigned int sysctl_sched_shares_thresh;
bf0f6f24 1866extern unsigned int sysctl_sched_child_runs_first;
1983a922
CE		 1867
1868enum sched_tunable_scaling {
1869 SCHED_TUNABLESCALING_NONE,
1870 SCHED_TUNABLESCALING_LOG,
1871 SCHED_TUNABLESCALING_LINEAR,
1872 SCHED_TUNABLESCALING_END,
1873};
1874extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1875
2bba22c5 1876#ifdef CONFIG_SCHED_DEBUG
da84d961 1877extern unsigned int sysctl_sched_migration_cost;
b82d9fdd 1878extern unsigned int sysctl_sched_nr_migrate;
e9e9250b 1879extern unsigned int sysctl_sched_time_avg;
cd1bb94b 1880extern unsigned int sysctl_timer_migration;
b2be5e96 1881
1983a922 1882int sched_proc_update_handler(struct ctl_table *table, int write,
8d65af78 1883 void __user *buffer, size_t *length,
b2be5e96 1884 loff_t *ppos);
2bd8e6d4 1885#endif
eea08f32
AB		 1886#ifdef CONFIG_SCHED_DEBUG
1887static inline unsigned int get_sysctl_timer_migration(void)
1888{
1889 return sysctl_timer_migration;
1890}
1891#else
1892static inline unsigned int get_sysctl_timer_migration(void)
1893{
1894 return 1;
1895}
1896#endif
9f0c1e56
PZ		 1897extern unsigned int sysctl_sched_rt_period;
1898extern int sysctl_sched_rt_runtime;
2bd8e6d4 1899
d0b27fa7 1900int sched_rt_handler(struct ctl_table *table, int write,
8d65af78 1901 void __user *buffer, size_t *lenp,
d0b27fa7
PZ		 1902 loff_t *ppos);
1903
2bd8e6d4 1904extern unsigned int sysctl_sched_compat_yield;
bf0f6f24 1905
b29739f9 1906#ifdef CONFIG_RT_MUTEXES
36c8b586
IM		 1907extern int rt_mutex_getprio(struct task_struct *p);
1908extern void rt_mutex_setprio(struct task_struct *p, int prio);
1909extern void rt_mutex_adjust_pi(struct task_struct *p);
b29739f9 1910#else
e868171a 1911static inline int rt_mutex_getprio(struct task_struct *p)
b29739f9
IM		 1912{
1913 return p->normal_prio;
1914}
95e02ca9 1915# define rt_mutex_adjust_pi(p) do { } while (0)
b29739f9
IM		 1916#endif
1917
36c8b586
IM		 1918extern void set_user_nice(struct task_struct *p, long nice);
1919extern int task_prio(const struct task_struct *p);
1920extern int task_nice(const struct task_struct *p);
1921extern int can_nice(const struct task_struct *p, const int nice);
1922extern int task_curr(const struct task_struct *p);
1da177e4
LT		 1923extern int idle_cpu(int cpu);
1924extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
961ccddd
RR		 1925extern int sched_setscheduler_nocheck(struct task_struct *, int,
1926 struct sched_param *);
36c8b586
IM		 1927extern struct task_struct *idle_task(int cpu);
1928extern struct task_struct *curr_task(int cpu);
1929extern void set_curr_task(int cpu, struct task_struct *p);
1da177e4
LT		 1930
1931void yield(void);
1932
1933/*
1934 * The default (Linux) execution domain.
1935 */
1936extern struct exec_domain default_exec_domain;
1937
1938union thread_union {
1939 struct thread_info thread_info;
1940 unsigned long stack[THREAD_SIZE/sizeof(long)];
1941};
1942
1943#ifndef __HAVE_ARCH_KSTACK_END
1944static inline int kstack_end(void *addr)
1945{
1946 /* Reliable end of stack detection:
1947 * Some APM bios versions misalign the stack
1948 */
1949 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1950}
1951#endif
1952
1953extern union thread_union init_thread_union;
1954extern struct task_struct init_task;
1955
1956extern struct mm_struct init_mm;
1957
198fe21b
PE		 1958extern struct pid_namespace init_pid_ns;
1959
1960/*
1961 * find a task by one of its numerical ids
1962 *
198fe21b
PE		 1963 * find_task_by_pid_ns():
1964 * finds a task by its pid in the specified namespace
228ebcbe
PE		 1965 * find_task_by_vpid():
1966 * finds a task by its virtual pid
198fe21b 1967 *
e49859e7 1968 * see also find_vpid() etc in include/linux/pid.h
198fe21b
PE		 1969 */
1970
228ebcbe
PE		 1971extern struct task_struct *find_task_by_vpid(pid_t nr);
1972extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1973 struct pid_namespace *ns);
198fe21b 1974
8520d7c7 1975extern void __set_special_pids(struct pid *pid);
1da177e4
LT		 1976
1977/* per-UID process charging. */
acce292c 1978extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1da177e4
LT		 1979static inline struct user_struct *get_uid(struct user_struct *u)
1980{
1981 atomic_inc(&u->__count);
1982 return u;
1983}
1984extern void free_uid(struct user_struct *);
28f300d2 1985extern void release_uids(struct user_namespace *ns);
1da177e4
LT		 1986
1987#include <asm/current.h>
1988
3171a030 1989extern void do_timer(unsigned long ticks);
1da177e4 1990
b3c97528
HH		 1991extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1992extern int wake_up_process(struct task_struct *tsk);
1993extern void wake_up_new_task(struct task_struct *tsk,
1994 unsigned long clone_flags);
1da177e4
LT		 1995#ifdef CONFIG_SMP
1996 extern void kick_process(struct task_struct *tsk);
1997#else
1998 static inline void kick_process(struct task_struct *tsk) { }
1999#endif
ad46c2c4
IM		 2000extern void sched_fork(struct task_struct *p, int clone_flags);
2001extern void sched_dead(struct task_struct *p);
1da177e4 2002
1da177e4
LT		 2003extern void proc_caches_init(void);
2004extern void flush_signals(struct task_struct *);
3bcac026 2005extern void __flush_signals(struct task_struct *);
10ab825b 2006extern void ignore_signals(struct task_struct *);
1da177e4
LT		 2007extern void flush_signal_handlers(struct task_struct *, int force_default);
2008extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2009
2010static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2011{
2012 unsigned long flags;
2013 int ret;
2014
2015 spin_lock_irqsave(&tsk->sighand->siglock, flags);
2016 ret = dequeue_signal(tsk, mask, info);
2017 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2018
2019 return ret;
2020}
2021
2022extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2023 sigset_t *mask);
2024extern void unblock_all_signals(void);
2025extern void release_task(struct task_struct * p);
2026extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1da177e4
LT		 2027extern int force_sigsegv(int, struct task_struct *);
2028extern int force_sig_info(int, struct siginfo *, struct task_struct *);
c4b92fc1 2029extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
c4b92fc1 2030extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2425c08b 2031extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
c4b92fc1
EB		 2032extern int kill_pgrp(struct pid *pid, int sig, int priv);
2033extern int kill_pid(struct pid *pid, int sig, int priv);
c3de4b38 2034extern int kill_proc_info(int, struct siginfo *, pid_t);
2b2a1ff6 2035extern int do_notify_parent(struct task_struct *, int);
a7f0765e 2036extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
1da177e4 2037extern void force_sig(int, struct task_struct *);
1da177e4
LT		 2038extern int send_sig(int, struct task_struct *, int);
2039extern void zap_other_threads(struct task_struct *p);
1da177e4
LT		 2040extern struct sigqueue *sigqueue_alloc(void);
2041extern void sigqueue_free(struct sigqueue *);
ac5c2153 2042extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
9ac95f2f 2043extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1da177e4
LT		 2044extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2045
9ec52099
CLG		 2046static inline int kill_cad_pid(int sig, int priv)
2047{
2048 return kill_pid(cad_pid, sig, priv);
2049}
2050
1da177e4
LT		 2051/* These can be the second arg to send_sig_info/send_group_sig_info. */
2052#define SEND_SIG_NOINFO ((struct siginfo *) 0)
2053#define SEND_SIG_PRIV ((struct siginfo *) 1)
2054#define SEND_SIG_FORCED ((struct siginfo *) 2)
2055
2a855dd0
SAS		 2056/*
2057 * True if we are on the alternate signal stack.
2058 */
1da177e4
LT		 2059static inline int on_sig_stack(unsigned long sp)
2060{
2a855dd0
SAS		 2061#ifdef CONFIG_STACK_GROWSUP
2062 return sp >= current->sas_ss_sp &&
2063 sp - current->sas_ss_sp < current->sas_ss_size;
2064#else
2065 return sp > current->sas_ss_sp &&
2066 sp - current->sas_ss_sp <= current->sas_ss_size;
2067#endif
1da177e4
LT		 2068}
2069
2070static inline int sas_ss_flags(unsigned long sp)
2071{
2072 return (current->sas_ss_size == 0 ? SS_DISABLE
2073 : on_sig_stack(sp) ? SS_ONSTACK : 0);
2074}
2075
1da177e4
LT		 2076/*
2077 * Routines for handling mm_structs
2078 */
2079extern struct mm_struct * mm_alloc(void);
2080
2081/* mmdrop drops the mm and the page tables */
b3c97528 2082extern void __mmdrop(struct mm_struct *);
1da177e4
LT		 2083static inline void mmdrop(struct mm_struct * mm)
2084{
6fb43d7b 2085 if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1da177e4
LT		 2086 __mmdrop(mm);
2087}
2088
2089/* mmput gets rid of the mappings and all user-space */
2090extern void mmput(struct mm_struct *);
2091/* Grab a reference to a task's mm, if it is not already going away */
2092extern struct mm_struct *get_task_mm(struct task_struct *task);
2093/* Remove the current tasks stale references to the old mm_struct */
2094extern void mm_release(struct task_struct *, struct mm_struct *);
402b0862
CO		 2095/* Allocate a new mm structure and copy contents from tsk->mm */
2096extern struct mm_struct *dup_mm(struct task_struct *tsk);
1da177e4 2097
6f2c55b8
AD		 2098extern int copy_thread(unsigned long, unsigned long, unsigned long,
2099 struct task_struct *, struct pt_regs *);
1da177e4
LT		 2100extern void flush_thread(void);
2101extern void exit_thread(void);
2102
1da177e4 2103extern void exit_files(struct task_struct *);
6b3934ef 2104extern void __cleanup_signal(struct signal_struct *);
a7e5328a 2105extern void __cleanup_sighand(struct sighand_struct *);
cbaffba1 2106
1da177e4 2107extern void exit_itimers(struct signal_struct *);
cbaffba1 2108extern void flush_itimer_signals(void);
1da177e4
LT		 2109
2110extern NORET_TYPE void do_group_exit(int);
2111
1da177e4
LT		 2112extern void daemonize(const char *, ...);
2113extern int allow_signal(int);
2114extern int disallow_signal(int);
1da177e4
LT		 2115
2116extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
2117extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
36c8b586 2118struct task_struct *fork_idle(int);
1da177e4
LT		 2119
2120extern void set_task_comm(struct task_struct *tsk, char *from);
59714d65 2121extern char *get_task_comm(char *to, struct task_struct *tsk);
1da177e4
LT		 2122
2123#ifdef CONFIG_SMP
85ba2d86 2124extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1da177e4 2125#else
85ba2d86
RM		 2126static inline unsigned long wait_task_inactive(struct task_struct *p,
2127 long match_state)
2128{
2129 return 1;
2130}
1da177e4
LT		 2131#endif
2132
05725f7e
JP		 2133#define next_task(p) \
2134 list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
1da177e4
LT		 2135
2136#define for_each_process(p) \
2137 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2138
5bb459bb 2139extern bool current_is_single_threaded(void);
d84f4f99 2140
1da177e4
LT		 2141/*
2142 * Careful: do_each_thread/while_each_thread is a double loop so
2143 * 'break' will not work as expected - use goto instead.
2144 */
2145#define do_each_thread(g, t) \
2146 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2147
2148#define while_each_thread(g, t) \
2149 while ((t = next_thread(t)) != g)
2150
de12a787
EB		 2151/* de_thread depends on thread_group_leader not being a pid based check */
2152#define thread_group_leader(p) (p == p->group_leader)
1da177e4 2153
0804ef4b
EB		 2154/* Do to the insanities of de_thread it is possible for a process
2155 * to have the pid of the thread group leader without actually being
2156 * the thread group leader. For iteration through the pids in proc
2157 * all we care about is that we have a task with the appropriate
2158 * pid, we don't actually care if we have the right task.
2159 */
e868171a 2160static inline int has_group_leader_pid(struct task_struct *p)
0804ef4b
EB		 2161{
2162 return p->pid == p->tgid;
2163}
2164
bac0abd6
PE		 2165static inline
2166int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2167{
2168 return p1->tgid == p2->tgid;
2169}
2170
36c8b586 2171static inline struct task_struct *next_thread(const struct task_struct *p)
47e65328 2172{
05725f7e
JP		 2173 return list_entry_rcu(p->thread_group.next,
2174 struct task_struct, thread_group);
47e65328
ON		 2175}
2176
e868171a 2177static inline int thread_group_empty(struct task_struct *p)
1da177e4 2178{
47e65328 2179 return list_empty(&p->thread_group);
1da177e4
LT		 2180}
2181
2182#define delay_group_leader(p) \
2183 (thread_group_leader(p) && !thread_group_empty(p))
2184
39c626ae
ON		 2185static inline int task_detached(struct task_struct *p)
2186{
2187 return p->exit_signal == -1;
2188}
2189
1da177e4 2190/*
260ea101 2191 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
22e2c507 2192 * subscriptions and synchronises with wait4(). Also used in procfs. Also
ddbcc7e8
PM		 2193 * pins the final release of task.io_context. Also protects ->cpuset and
2194 * ->cgroup.subsys[].
1da177e4
LT		 2195 *
2196 * Nests both inside and outside of read_lock(&tasklist_lock).
2197 * It must not be nested with write_lock_irq(&tasklist_lock),
2198 * neither inside nor outside.
2199 */
2200static inline void task_lock(struct task_struct *p)
2201{
2202 spin_lock(&p->alloc_lock);
2203}
2204
2205static inline void task_unlock(struct task_struct *p)
2206{
2207 spin_unlock(&p->alloc_lock);
2208}
2209
f63ee72e
ON		 2210extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
2211 unsigned long *flags);
2212
2213static inline void unlock_task_sighand(struct task_struct *tsk,
2214 unsigned long *flags)
2215{
2216 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2217}
2218
f037360f
AV		 2219#ifndef __HAVE_THREAD_FUNCTIONS
2220
f7e4217b
RZ		 2221#define task_thread_info(task) ((struct thread_info *)(task)->stack)
2222#define task_stack_page(task) ((task)->stack)
a1261f54 2223
10ebffde
AV		 2224static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2225{
2226 *task_thread_info(p) = *task_thread_info(org);
2227 task_thread_info(p)->task = p;
2228}
2229
2230static inline unsigned long *end_of_stack(struct task_struct *p)
2231{
f7e4217b 2232 return (unsigned long *)(task_thread_info(p) + 1);
10ebffde
AV		 2233}
2234
f037360f
AV		 2235#endif
2236
8b05c7e6
FT		 2237static inline int object_is_on_stack(void *obj)
2238{
2239 void *stack = task_stack_page(current);
2240
2241 return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2242}
2243
8c9843e5
BH		 2244extern void thread_info_cache_init(void);
2245
7c9f8861
ES		 2246#ifdef CONFIG_DEBUG_STACK_USAGE
2247static inline unsigned long stack_not_used(struct task_struct *p)
2248{
2249 unsigned long *n = end_of_stack(p);
2250
2251 do { /* Skip over canary */
2252 n++;
2253 } while (!*n);
2254
2255 return (unsigned long)n - (unsigned long)end_of_stack(p);
2256}
2257#endif
2258
1da177e4
LT		 2259/* set thread flags in other task's structures
2260 * - see asm/thread_info.h for TIF_xxxx flags available
2261 */
2262static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2263{
a1261f54 2264 set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2265}
2266
2267static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2268{
a1261f54 2269 clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2270}
2271
2272static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2273{
a1261f54 2274 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2275}
2276
2277static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2278{
a1261f54 2279 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2280}
2281
2282static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2283{
a1261f54 2284 return test_ti_thread_flag(task_thread_info(tsk), flag);
1da177e4
LT		 2285}
2286
2287static inline void set_tsk_need_resched(struct task_struct *tsk)
2288{
2289 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2290}
2291
2292static inline void clear_tsk_need_resched(struct task_struct *tsk)
2293{
2294 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2295}
2296
8ae121ac
GH		 2297static inline int test_tsk_need_resched(struct task_struct *tsk)
2298{
2299 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2300}
2301
690cc3ff
EB		 2302static inline int restart_syscall(void)
2303{
2304 set_tsk_thread_flag(current, TIF_SIGPENDING);
2305 return -ERESTARTNOINTR;
2306}
2307
1da177e4
LT		 2308static inline int signal_pending(struct task_struct *p)
2309{
2310 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2311}
f776d12d 2312
d9588725
RM		 2313static inline int __fatal_signal_pending(struct task_struct *p)
2314{
2315 return unlikely(sigismember(&p->pending.signal, SIGKILL));
2316}
f776d12d
MW		 2317
2318static inline int fatal_signal_pending(struct task_struct *p)
2319{
2320 return signal_pending(p) && __fatal_signal_pending(p);
2321}
2322
16882c1e
ON		 2323static inline int signal_pending_state(long state, struct task_struct *p)
2324{
2325 if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2326 return 0;
2327 if (!signal_pending(p))
2328 return 0;
2329
16882c1e
ON		 2330 return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2331}
2332
1da177e4
LT		 2333static inline int need_resched(void)
2334{
9404ef02 2335 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1da177e4
LT		 2336}
2337
2338/*
2339 * cond_resched() and cond_resched_lock(): latency reduction via
2340 * explicit rescheduling in places that are safe. The return
2341 * value indicates whether a reschedule was done in fact.
2342 * cond_resched_lock() will drop the spinlock before scheduling,
2343 * cond_resched_softirq() will enable bhs before scheduling.
2344 */
c3921ab7 2345extern int _cond_resched(void);
6f80bd98 2346
613afbf8
FW		 2347#define cond_resched() ({ \
2348 __might_sleep(__FILE__, __LINE__, 0); \
2349 _cond_resched(); \
2350})
6f80bd98 2351
613afbf8
FW		 2352extern int __cond_resched_lock(spinlock_t *lock);
2353
716a4234
FW		 2354#ifdef CONFIG_PREEMPT
2355#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
02b67cc3 2356#else
716a4234 2357#define PREEMPT_LOCK_OFFSET 0
02b67cc3 2358#endif
716a4234 2359
613afbf8 2360#define cond_resched_lock(lock) ({ \
716a4234 2361 __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
613afbf8
FW		 2362 __cond_resched_lock(lock); \
2363})
2364
2365extern int __cond_resched_softirq(void);
2366
2367#define cond_resched_softirq() ({ \
2368 __might_sleep(__FILE__, __LINE__, SOFTIRQ_OFFSET); \
2369 __cond_resched_softirq(); \
2370})
1da177e4
LT		 2371
2372/*
2373 * Does a critical section need to be broken due to another
95c354fe
NP		 2374 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2375 * but a general need for low latency)
1da177e4 2376 */
95c354fe 2377static inline int spin_needbreak(spinlock_t *lock)
1da177e4 2378{
95c354fe
NP		 2379#ifdef CONFIG_PREEMPT
2380 return spin_is_contended(lock);
2381#else
1da177e4 2382 return 0;
95c354fe 2383#endif
1da177e4
LT		 2384}
2385
f06febc9
FM		 2386/*
2387 * Thread group CPU time accounting.
2388 */
4cd4c1b4 2389void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
4da94d49 2390void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
f06febc9 2391
490dea45 2392static inline void thread_group_cputime_init(struct signal_struct *sig)
f06febc9 2393{
4cd4c1b4 2394 spin_lock_init(&sig->cputimer.lock);
f06febc9
FM		 2395}
2396
f06febc9
FM		 2397static inline void thread_group_cputime_free(struct signal_struct *sig)
2398{
f06febc9
FM		 2399}
2400
7bb44ade
RM		 2401/*
2402 * Reevaluate whether the task has signals pending delivery.
2403 * Wake the task if so.
2404 * This is required every time the blocked sigset_t changes.
2405 * callers must hold sighand->siglock.
2406 */
2407extern void recalc_sigpending_and_wake(struct task_struct *t);
1da177e4
LT		 2408extern void recalc_sigpending(void);
2409
2410extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2411
2412/*
2413 * Wrappers for p->thread_info->cpu access. No-op on UP.
2414 */
2415#ifdef CONFIG_SMP
2416
2417static inline unsigned int task_cpu(const struct task_struct *p)
2418{
a1261f54 2419 return task_thread_info(p)->cpu;
1da177e4
LT		 2420}
2421
c65cc870 2422extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
1da177e4
LT		 2423
2424#else
2425
2426static inline unsigned int task_cpu(const struct task_struct *p)
2427{
2428 return 0;
2429}
2430
2431static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2432{
2433}
2434
2435#endif /* CONFIG_SMP */
2436
1a3c3034
IM		 2437#ifdef CONFIG_TRACING
2438extern void
2439__trace_special(void *__tr, void *__data,
2440 unsigned long arg1, unsigned long arg2, unsigned long arg3);
1da177e4 2441#else
1a3c3034
IM		 2442static inline void
2443__trace_special(void *__tr, void *__data,
2444 unsigned long arg1, unsigned long arg2, unsigned long arg3)
1da177e4 2445{
1da177e4
LT		 2446}
2447#endif
2448
96f874e2
RR		 2449extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2450extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
5c45bf27 2451
1da177e4
LT		 2452extern void normalize_rt_tasks(void);
2453
7c941438 2454#ifdef CONFIG_CGROUP_SCHED
9b5b7751 2455
4cf86d77 2456extern struct task_group init_task_group;
9b5b7751 2457
ec7dc8ac 2458extern struct task_group *sched_create_group(struct task_group *parent);
4cf86d77 2459extern void sched_destroy_group(struct task_group *tg);
9b5b7751 2460extern void sched_move_task(struct task_struct *tsk);
052f1dc7 2461#ifdef CONFIG_FAIR_GROUP_SCHED
4cf86d77 2462extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
5cb350ba 2463extern unsigned long sched_group_shares(struct task_group *tg);
052f1dc7
PZ		 2464#endif
2465#ifdef CONFIG_RT_GROUP_SCHED
9f0c1e56
PZ		 2466extern int sched_group_set_rt_runtime(struct task_group *tg,
2467 long rt_runtime_us);
2468extern long sched_group_rt_runtime(struct task_group *tg);
d0b27fa7
PZ		 2469extern int sched_group_set_rt_period(struct task_group *tg,
2470 long rt_period_us);
2471extern long sched_group_rt_period(struct task_group *tg);
54e99124 2472extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
052f1dc7 2473#endif
9b5b7751
SV		 2474#endif
2475
54e99124
DG		 2476extern int task_can_switch_user(struct user_struct *up,
2477 struct task_struct *tsk);
2478
4b98d11b
AD		 2479#ifdef CONFIG_TASK_XACCT
2480static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2481{
940389b8 2482 tsk->ioac.rchar += amt;
4b98d11b
AD		 2483}
2484
2485static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2486{
940389b8 2487 tsk->ioac.wchar += amt;
4b98d11b
AD		 2488}
2489
2490static inline void inc_syscr(struct task_struct *tsk)
2491{
940389b8 2492 tsk->ioac.syscr++;
4b98d11b
AD		 2493}
2494
2495static inline void inc_syscw(struct task_struct *tsk)
2496{
940389b8 2497 tsk->ioac.syscw++;
4b98d11b
AD		 2498}
2499#else
2500static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2501{
2502}
2503
2504static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2505{
2506}
2507
2508static inline void inc_syscr(struct task_struct *tsk)
2509{
2510}
2511
2512static inline void inc_syscw(struct task_struct *tsk)
2513{
2514}
2515#endif
2516
82455257
DH		 2517#ifndef TASK_SIZE_OF
2518#define TASK_SIZE_OF(tsk) TASK_SIZE
2519#endif
2520
0793a61d
TG		 2521/*
2522 * Call the function if the target task is executing on a CPU right now:
2523 */
2524extern void task_oncpu_function_call(struct task_struct *p,
2525 void (*func) (void *info), void *info);
2526
2527
cf475ad2
BS		 2528#ifdef CONFIG_MM_OWNER
2529extern void mm_update_next_owner(struct mm_struct *mm);
2530extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2531#else
2532static inline void mm_update_next_owner(struct mm_struct *mm)
2533{
2534}
2535
2536static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2537{
2538}
2539#endif /* CONFIG_MM_OWNER */
2540
3e10e716
JS		 2541static inline unsigned long task_rlimit(const struct task_struct *tsk,
2542 unsigned int limit)
2543{
2544 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2545}
2546
2547static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2548 unsigned int limit)
2549{
2550 return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2551}
2552
2553static inline unsigned long rlimit(unsigned int limit)
2554{
2555 return task_rlimit(current, limit);
2556}
2557
2558static inline unsigned long rlimit_max(unsigned int limit)
2559{
2560 return task_rlimit_max(current, limit);
2561}
2562
1da177e4
LT		 2563#endif /* __KERNEL__ */
2564
2565#endif
kernel source for telekom puls (alcatel/mediatek)