4 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
9 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
10 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
11 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
12 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
13 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
14 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
15 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
16 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
17 #define CLONE_THREAD 0x00010000 /* Same thread group? */
18 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
19 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
20 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
21 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
22 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
23 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
24 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
25 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
26 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
31 #define SCHED_NORMAL 0
42 #include <asm/param.h> /* for HZ */
44 #include <linux/capability.h>
45 #include <linux/threads.h>
46 #include <linux/kernel.h>
47 #include <linux/types.h>
48 #include <linux/timex.h>
49 #include <linux/jiffies.h>
50 #include <linux/rbtree.h>
51 #include <linux/thread_info.h>
52 #include <linux/cpumask.h>
53 #include <linux/errno.h>
54 #include <linux/nodemask.h>
56 #include <asm/system.h>
57 #include <asm/semaphore.h>
59 #include <asm/ptrace.h>
61 #include <asm/cputime.h>
63 #include <linux/smp.h>
64 #include <linux/sem.h>
65 #include <linux/signal.h>
66 #include <linux/securebits.h>
67 #include <linux/fs_struct.h>
68 #include <linux/compiler.h>
69 #include <linux/completion.h>
70 #include <linux/pid.h>
71 #include <linux/percpu.h>
72 #include <linux/topology.h>
73 #include <linux/seccomp.h>
74 #include <linux/rcupdate.h>
75 #include <linux/futex.h>
76 #include <linux/rtmutex.h>
78 #include <linux/time.h>
79 #include <linux/param.h>
80 #include <linux/resource.h>
81 #include <linux/timer.h>
82 #include <linux/hrtimer.h>
84 #include <asm/processor.h>
87 struct futex_pi_state;
88 extern int exec_shield;
89 extern int print_fatal_signals;
92 * List of flags we want to share for kernel threads,
93 * if only because they are not used by them anyway.
95 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
98 * These are the constant used to fake the fixed-point load-average
99 * counting. Some notes:
100 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
101 * a load-average precision of 10 bits integer + 11 bits fractional
102 * - if you want to count load-averages more often, you need more
103 * precision, or rounding will get you. With 2-second counting freq,
104 * the EXP_n values would be 1981, 2034 and 2043 if still using only
107 extern unsigned long avenrun[]; /* Load averages */
109 #define FSHIFT 11 /* nr of bits of precision */
110 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
111 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
112 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
113 #define EXP_5 2014 /* 1/exp(5sec/5min) */
114 #define EXP_15 2037 /* 1/exp(5sec/15min) */
116 #define CALC_LOAD(load,exp,n) \
118 load += n*(FIXED_1-exp); \
121 extern unsigned long total_forks;
122 extern int nr_threads;
124 DECLARE_PER_CPU(unsigned long, process_counts);
125 extern int nr_processes(void);
126 extern unsigned long nr_running(void);
127 extern unsigned long nr_uninterruptible(void);
128 extern unsigned long nr_active(void);
129 extern unsigned long nr_iowait(void);
130 extern unsigned long weighted_cpuload(const int cpu);
134 * Task state bitmask. NOTE! These bits are also
135 * encoded in fs/proc/array.c: get_task_state().
137 * We have two separate sets of flags: task->state
138 * is about runnability, while task->exit_state are
139 * about the task exiting. Confusing, but this way
140 * modifying one set can't modify the other one by
143 #define TASK_RUNNING 0
144 #define TASK_INTERRUPTIBLE 1
145 #define TASK_UNINTERRUPTIBLE 2
146 #define TASK_STOPPED 4
147 #define TASK_TRACED 8
148 /* in tsk->exit_state */
149 #define EXIT_ZOMBIE 16
151 /* in tsk->state again */
152 #define TASK_NONINTERACTIVE 64
153 #define TASK_ONHOLD 128
155 #define __set_task_state(tsk, state_value) \
156 do { (tsk)->state = (state_value); } while (0)
157 #define set_task_state(tsk, state_value) \
158 set_mb((tsk)->state, (state_value))
161 * set_current_state() includes a barrier so that the write of current->state
162 * is correctly serialised wrt the caller's subsequent test of whether to
165 * set_current_state(TASK_UNINTERRUPTIBLE);
166 * if (do_i_need_to_sleep())
169 * If the caller does not need such serialisation then use __set_current_state()
171 #define __set_current_state(state_value) \
172 do { current->state = (state_value); } while (0)
173 #define set_current_state(state_value) \
174 set_mb(current->state, (state_value))
176 /* Task command name length */
177 #define TASK_COMM_LEN 16
179 #include <linux/spinlock.h>
182 * This serializes "schedule()" and also protects
183 * the run-queue from deletions/modifications (but
184 * _adding_ to the beginning of the run-queue has
187 extern rwlock_t tasklist_lock;
188 extern spinlock_t mmlist_lock;
192 extern void sched_init(void);
193 extern void sched_init_smp(void);
194 extern void init_idle(struct task_struct *idle, int cpu);
196 extern cpumask_t nohz_cpu_mask;
198 extern void show_state(void);
199 extern void show_regs(struct pt_regs *);
202 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
203 * task), SP is the stack pointer of the first frame that should be shown in the back
204 * trace (or NULL if the entire call-chain of the task should be shown).
206 extern void show_stack(struct task_struct *task, unsigned long *sp);
208 void io_schedule(void);
209 long io_schedule_timeout(long timeout);
211 extern void cpu_init (void);
212 extern void trap_init(void);
213 extern void update_process_times(int user);
214 extern void scheduler_tick(void);
216 #ifdef CONFIG_DETECT_SOFTLOCKUP
217 extern void softlockup_tick(void);
218 extern void spawn_softlockup_task(void);
219 extern void touch_softlockup_watchdog(void);
221 static inline void softlockup_tick(void)
224 static inline void spawn_softlockup_task(void)
227 static inline void touch_softlockup_watchdog(void)
233 /* Attach to any functions which should be ignored in wchan output. */
234 #define __sched __attribute__((__section__(".sched.text")))
235 /* Is this address in the __sched functions? */
236 extern int in_sched_functions(unsigned long addr);
238 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
239 extern signed long FASTCALL(schedule_timeout(signed long timeout));
240 extern signed long schedule_timeout_interruptible(signed long timeout);
241 extern signed long schedule_timeout_uninterruptible(signed long timeout);
242 asmlinkage void schedule(void);
246 /* Maximum number of active map areas.. This is a random (large) number */
247 #define DEFAULT_MAX_MAP_COUNT 65536
249 extern int sysctl_max_map_count;
251 #include <linux/aio.h>
254 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
255 unsigned long, unsigned long);
258 arch_get_unmapped_exec_area(struct file *, unsigned long, unsigned long,
259 unsigned long, unsigned long);
261 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
262 unsigned long len, unsigned long pgoff,
263 unsigned long flags);
264 extern void arch_unmap_area(struct mm_struct *, unsigned long);
265 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
267 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
269 * The mm counters are not protected by its page_table_lock,
270 * so must be incremented atomically.
272 typedef atomic_long_t mm_counter_t;
273 #define __set_mm_counter(mm, member, value) \
274 atomic_long_set(&(mm)->_##member, value)
275 #define get_mm_counter(mm, member) \
276 ((unsigned long)atomic_long_read(&(mm)->_##member))
278 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
280 * The mm counters are protected by its page_table_lock,
281 * so can be incremented directly.
283 typedef unsigned long mm_counter_t;
284 #define __set_mm_counter(mm, member, value) (mm)->_##member = (value)
285 #define get_mm_counter(mm, member) ((mm)->_##member)
287 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
289 #define set_mm_counter(mm, member, value) \
290 vx_ ## member ## pages_sub((mm), (get_mm_counter(mm, member) - value))
291 #define add_mm_counter(mm, member, value) \
292 vx_ ## member ## pages_add((mm), (value))
293 #define inc_mm_counter(mm, member) vx_ ## member ## pages_inc((mm))
294 #define dec_mm_counter(mm, member) vx_ ## member ## pages_dec((mm))
296 #define get_mm_rss(mm) \
297 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
298 #define update_hiwater_rss(mm) do { \
299 unsigned long _rss = get_mm_rss(mm); \
300 if ((mm)->hiwater_rss < _rss) \
301 (mm)->hiwater_rss = _rss; \
303 #define update_hiwater_vm(mm) do { \
304 if ((mm)->hiwater_vm < (mm)->total_vm) \
305 (mm)->hiwater_vm = (mm)->total_vm; \
309 struct vm_area_struct * mmap; /* list of VMAs */
310 struct rb_root mm_rb;
311 struct vm_area_struct * mmap_cache; /* last find_vma result */
312 unsigned long (*get_unmapped_area) (struct file *filp,
313 unsigned long addr, unsigned long len,
314 unsigned long pgoff, unsigned long flags);
315 unsigned long (*get_unmapped_exec_area) (struct file *filp,
316 unsigned long addr, unsigned long len,
317 unsigned long pgoff, unsigned long flags);
318 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
319 unsigned long mmap_base; /* base of mmap area */
320 unsigned long task_size; /* size of task vm space */
321 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
322 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
324 atomic_t mm_users; /* How many users with user space? */
325 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
326 int map_count; /* number of VMAs */
327 struct rw_semaphore mmap_sem;
328 spinlock_t page_table_lock; /* Protects page tables and some counters */
330 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
331 * together off init_mm.mmlist, and are protected
335 /* Special counters, in some configurations protected by the
336 * page_table_lock, in other configurations by being atomic.
338 mm_counter_t _file_rss;
339 mm_counter_t _anon_rss;
341 unsigned long hiwater_rss; /* High-watermark of RSS usage */
342 unsigned long hiwater_vm; /* High-water virtual memory usage */
344 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
345 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
346 unsigned long start_code, end_code, start_data, end_data;
347 unsigned long start_brk, brk, start_stack;
348 unsigned long arg_start, arg_end, env_start, env_end;
350 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
353 cpumask_t cpu_vm_mask;
355 /* Architecture-specific MM context */
356 mm_context_t context;
357 struct vx_info *mm_vx_info;
359 /* Token based thrashing protection. */
360 unsigned long swap_token_time;
363 /* coredumping support */
365 struct completion *core_startup_done, core_done;
368 rwlock_t ioctx_list_lock;
369 struct kioctx *ioctx_list;
372 struct sighand_struct {
374 struct k_sigaction action[_NSIG];
378 struct pacct_struct {
381 unsigned long ac_mem;
382 cputime_t ac_utime, ac_stime;
383 unsigned long ac_minflt, ac_majflt;
387 * NOTE! "signal_struct" does not have it's own
388 * locking, because a shared signal_struct always
389 * implies a shared sighand_struct, so locking
390 * sighand_struct is always a proper superset of
391 * the locking of signal_struct.
393 struct signal_struct {
397 wait_queue_head_t wait_chldexit; /* for wait4() */
399 /* current thread group signal load-balancing target: */
400 struct task_struct *curr_target;
402 /* shared signal handling: */
403 struct sigpending shared_pending;
405 /* thread group exit support */
408 * - notify group_exit_task when ->count is equal to notify_count
409 * - everyone except group_exit_task is stopped during signal delivery
410 * of fatal signals, group_exit_task processes the signal.
412 struct task_struct *group_exit_task;
415 /* thread group stop support, overloads group_exit_code too */
416 int group_stop_count;
417 unsigned int flags; /* see SIGNAL_* flags below */
419 /* POSIX.1b Interval Timers */
420 struct list_head posix_timers;
422 /* ITIMER_REAL timer for the process */
423 struct hrtimer real_timer;
424 struct task_struct *tsk;
425 ktime_t it_real_incr;
427 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
428 cputime_t it_prof_expires, it_virt_expires;
429 cputime_t it_prof_incr, it_virt_incr;
431 /* job control IDs */
435 /* boolean value for session group leader */
438 struct tty_struct *tty; /* NULL if no tty */
441 * Cumulative resource counters for dead threads in the group,
442 * and for reaped dead child processes forked by this group.
443 * Live threads maintain their own counters and add to these
444 * in __exit_signal, except for the group leader.
446 cputime_t utime, stime, cutime, cstime;
447 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
448 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
451 * Cumulative ns of scheduled CPU time for dead threads in the
452 * group, not including a zombie group leader. (This only differs
453 * from jiffies_to_ns(utime + stime) if sched_clock uses something
454 * other than jiffies.)
456 unsigned long long sched_time;
459 * We don't bother to synchronize most readers of this at all,
460 * because there is no reader checking a limit that actually needs
461 * to get both rlim_cur and rlim_max atomically, and either one
462 * alone is a single word that can safely be read normally.
463 * getrlimit/setrlimit use task_lock(current->group_leader) to
464 * protect this instead of the siglock, because they really
465 * have no need to disable irqs.
467 struct rlimit rlim[RLIM_NLIMITS];
469 struct list_head cpu_timers[3];
471 /* keep the process-shared keyrings here so that they do the right
472 * thing in threads created with CLONE_THREAD */
474 struct key *session_keyring; /* keyring inherited over fork */
475 struct key *process_keyring; /* keyring private to this process */
477 #ifdef CONFIG_BSD_PROCESS_ACCT
478 struct pacct_struct pacct; /* per-process accounting information */
480 #ifdef CONFIG_TASKSTATS
481 spinlock_t stats_lock;
482 struct taskstats *stats;
486 /* Context switch must be unlocked if interrupts are to be enabled */
487 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
488 # define __ARCH_WANT_UNLOCKED_CTXSW
492 * Bits in flags field of signal_struct.
494 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
495 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
496 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
497 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
501 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
502 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
503 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
504 * values are inverted: lower p->prio value means higher priority.
506 * The MAX_USER_RT_PRIO value allows the actual maximum
507 * RT priority to be separate from the value exported to
508 * user-space. This allows kernel threads to set their
509 * priority to a value higher than any user task. Note:
510 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
513 #define MAX_USER_RT_PRIO 100
514 #define MAX_RT_PRIO MAX_USER_RT_PRIO
516 #define MAX_PRIO (MAX_RT_PRIO + 40)
518 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
519 #define rt_task(p) rt_prio((p)->prio)
520 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
521 #define has_rt_policy(p) \
522 unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH)
525 * Some day this will be a full-fledged user tracking system..
528 atomic_t __count; /* reference count */
529 atomic_t processes; /* How many processes does this user have? */
530 atomic_t files; /* How many open files does this user have? */
531 atomic_t sigpending; /* How many pending signals does this user have? */
532 #ifdef CONFIG_INOTIFY_USER
533 atomic_t inotify_watches; /* How many inotify watches does this user have? */
534 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
536 /* protected by mq_lock */
537 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
538 unsigned long locked_shm; /* How many pages of mlocked shm ? */
541 struct key *uid_keyring; /* UID specific keyring */
542 struct key *session_keyring; /* UID's default session keyring */
545 /* Hash table maintenance information */
546 struct list_head uidhash_list;
551 extern struct user_struct *find_user(xid_t, uid_t);
553 extern struct user_struct root_user;
554 #define INIT_USER (&root_user)
556 struct backing_dev_info;
557 struct reclaim_state;
559 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
561 /* cumulative counters */
562 unsigned long cpu_time, /* time spent on the cpu */
563 run_delay, /* time spent waiting on a runqueue */
564 pcnt; /* # of timeslices run on this cpu */
567 unsigned long last_arrival, /* when we last ran on a cpu */
568 last_queued; /* when we were last queued to run */
570 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
572 #ifdef CONFIG_SCHEDSTATS
573 extern struct file_operations proc_schedstat_operations;
574 #endif /* CONFIG_SCHEDSTATS */
576 #ifdef CONFIG_TASK_DELAY_ACCT
577 struct task_delay_info {
579 unsigned int flags; /* Private per-task flags */
581 /* For each stat XXX, add following, aligned appropriately
583 * struct timespec XXX_start, XXX_end;
587 * Atomicity of updates to XXX_delay, XXX_count protected by
588 * single lock above (split into XXX_lock if contention is an issue).
592 * XXX_count is incremented on every XXX operation, the delay
593 * associated with the operation is added to XXX_delay.
594 * XXX_delay contains the accumulated delay time in nanoseconds.
596 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
597 u64 blkio_delay; /* wait for sync block io completion */
598 u64 swapin_delay; /* wait for swapin block io completion */
599 u32 blkio_count; /* total count of the number of sync block */
600 /* io operations performed */
601 u32 swapin_count; /* total count of the number of swapin block */
602 /* io operations performed */
604 #endif /* CONFIG_TASK_DELAY_ACCT */
606 static inline int sched_info_on(void)
608 #ifdef CONFIG_SCHEDSTATS
610 #elif defined(CONFIG_TASK_DELAY_ACCT)
611 extern int delayacct_on;
627 * sched-domains (multiprocessor balancing) declarations:
629 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
632 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
633 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
634 #define SD_BALANCE_EXEC 4 /* Balance on exec */
635 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
636 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
637 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
638 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
639 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
640 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
642 #define BALANCE_FOR_POWER ((sched_mc_power_savings || sched_smt_power_savings) \
643 ? SD_POWERSAVINGS_BALANCE : 0)
647 struct sched_group *next; /* Must be a circular list */
651 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
652 * single CPU. This is read only (except for setup, hotplug CPU).
654 unsigned long cpu_power;
657 struct sched_domain {
658 /* These fields must be setup */
659 struct sched_domain *parent; /* top domain must be null terminated */
660 struct sched_group *groups; /* the balancing groups of the domain */
661 cpumask_t span; /* span of all CPUs in this domain */
662 unsigned long min_interval; /* Minimum balance interval ms */
663 unsigned long max_interval; /* Maximum balance interval ms */
664 unsigned int busy_factor; /* less balancing by factor if busy */
665 unsigned int imbalance_pct; /* No balance until over watermark */
666 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
667 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
668 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
669 unsigned int busy_idx;
670 unsigned int idle_idx;
671 unsigned int newidle_idx;
672 unsigned int wake_idx;
673 unsigned int forkexec_idx;
674 int flags; /* See SD_* */
676 /* Runtime fields. */
677 unsigned long last_balance; /* init to jiffies. units in jiffies */
678 unsigned int balance_interval; /* initialise to 1. units in ms. */
679 unsigned int nr_balance_failed; /* initialise to 0 */
681 #ifdef CONFIG_SCHEDSTATS
682 /* load_balance() stats */
683 unsigned long lb_cnt[MAX_IDLE_TYPES];
684 unsigned long lb_failed[MAX_IDLE_TYPES];
685 unsigned long lb_balanced[MAX_IDLE_TYPES];
686 unsigned long lb_imbalance[MAX_IDLE_TYPES];
687 unsigned long lb_gained[MAX_IDLE_TYPES];
688 unsigned long lb_hot_gained[MAX_IDLE_TYPES];
689 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
690 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
692 /* Active load balancing */
693 unsigned long alb_cnt;
694 unsigned long alb_failed;
695 unsigned long alb_pushed;
697 /* SD_BALANCE_EXEC stats */
698 unsigned long sbe_cnt;
699 unsigned long sbe_balanced;
700 unsigned long sbe_pushed;
702 /* SD_BALANCE_FORK stats */
703 unsigned long sbf_cnt;
704 unsigned long sbf_balanced;
705 unsigned long sbf_pushed;
707 /* try_to_wake_up() stats */
708 unsigned long ttwu_wake_remote;
709 unsigned long ttwu_move_affine;
710 unsigned long ttwu_move_balance;
714 extern int partition_sched_domains(cpumask_t *partition1,
715 cpumask_t *partition2);
718 * Maximum cache size the migration-costs auto-tuning code will
721 extern unsigned int max_cache_size;
723 #endif /* CONFIG_SMP */
726 struct io_context; /* See blkdev.h */
727 void exit_io_context(void);
730 #define NGROUPS_SMALL 32
731 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
735 gid_t small_block[NGROUPS_SMALL];
741 * get_group_info() must be called with the owning task locked (via task_lock())
742 * when task != current. The reason being that the vast majority of callers are
743 * looking at current->group_info, which can not be changed except by the
744 * current task. Changing current->group_info requires the task lock, too.
746 #define get_group_info(group_info) do { \
747 atomic_inc(&(group_info)->usage); \
750 #define put_group_info(group_info) do { \
751 if (atomic_dec_and_test(&(group_info)->usage)) \
752 groups_free(group_info); \
755 extern struct group_info *groups_alloc(int gidsetsize);
756 extern void groups_free(struct group_info *group_info);
757 extern int set_current_groups(struct group_info *group_info);
758 extern int groups_search(struct group_info *group_info, gid_t grp);
759 /* access the groups "array" with this macro */
760 #define GROUP_AT(gi, i) \
761 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
763 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
764 extern void prefetch_stack(struct task_struct *t);
766 static inline void prefetch_stack(struct task_struct *t) { }
769 struct audit_context; /* See audit.c */
771 struct pipe_inode_info;
775 SLEEP_NONINTERACTIVE,
783 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
784 struct thread_info *thread_info;
786 unsigned long flags; /* per process flags, defined below */
788 int lock_depth; /* BKL lock depth */
791 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
795 int load_weight; /* for niceness load balancing purposes */
796 int prio, static_prio, normal_prio;
797 struct list_head run_list;
798 struct prio_array *array;
800 unsigned short ioprio;
801 unsigned int btrace_seq;
803 unsigned long sleep_avg;
804 unsigned long long timestamp, last_ran;
805 unsigned long long sched_time; /* sched_clock time spent running */
806 enum sleep_type sleep_type;
808 unsigned long policy;
809 cpumask_t cpus_allowed;
810 unsigned int time_slice, first_time_slice;
812 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
813 struct sched_info sched_info;
816 struct list_head tasks;
818 struct mm_struct *mm, *active_mm;
821 struct linux_binfmt *binfmt;
823 int exit_code, exit_signal;
824 int pdeath_signal; /* The signal sent when the parent dies */
826 unsigned long personality;
831 * pointers to parent process, youngest child, younger sibling,
832 * older sibling, respectively. (p->father can be replaced with
835 struct task_struct *parent; /* parent process */
837 * children/sibling forms the list of my children
839 struct list_head children; /* list of my children */
840 struct list_head sibling; /* linkage in my parent's children list */
841 struct task_struct *group_leader; /* threadgroup leader */
843 /* PID/PID hash table linkage. */
844 struct pid_link pids[PIDTYPE_MAX];
845 struct list_head thread_group;
847 struct completion *vfork_done; /* for vfork() */
848 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
849 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
851 unsigned long rt_priority;
852 cputime_t utime, stime;
853 unsigned long nvcsw, nivcsw; /* context switch counts */
854 struct timespec start_time;
855 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
856 unsigned long min_flt, maj_flt;
858 cputime_t it_prof_expires, it_virt_expires;
859 unsigned long long it_sched_expires;
860 struct list_head cpu_timers[3];
862 /* process credentials */
863 uid_t uid,euid,suid,fsuid;
864 gid_t gid,egid,sgid,fsgid;
865 struct group_info *group_info;
866 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
867 unsigned keep_capabilities:1;
868 struct user_struct *user;
870 struct key *request_key_auth; /* assumed request_key authority */
871 struct key *thread_keyring; /* keyring private to this thread */
872 unsigned char jit_keyring; /* default keyring to attach requested keys to */
874 int oomkilladj; /* OOM kill score adjustment (bit shift). */
875 char comm[TASK_COMM_LEN]; /* executable name excluding path
876 - access with [gs]et_task_comm (which lock
878 - initialized normally by flush_old_exec */
879 /* file system info */
880 int link_count, total_link_count;
882 struct sysv_sem sysvsem;
883 /* CPU-specific state of this task */
884 struct thread_struct thread;
885 /* filesystem information */
886 struct fs_struct *fs;
887 /* open file information */
888 struct files_struct *files;
890 struct namespace *namespace;
891 /* signal handlers */
892 struct signal_struct *signal;
893 struct sighand_struct *sighand;
895 sigset_t blocked, real_blocked;
896 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
897 struct sigpending pending;
899 unsigned long sas_ss_sp;
901 int (*notifier)(void *priv);
903 sigset_t *notifier_mask;
907 void (*tux_exit)(void);
911 struct audit_context *audit_context;
913 /* vserver context data */
914 struct vx_info *vx_info;
915 struct nx_info *nx_info;
923 struct utrace *utrace;
924 unsigned long utrace_flags;
927 /* Thread group tracking */
930 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
931 spinlock_t alloc_lock;
933 /* Protection of the PI data structures: */
936 #ifdef CONFIG_RT_MUTEXES
937 /* PI waiters blocked on a rt_mutex held by this task */
938 struct plist_head pi_waiters;
939 /* Deadlock detection and priority inheritance handling */
940 struct rt_mutex_waiter *pi_blocked_on;
943 #ifdef CONFIG_DEBUG_MUTEXES
944 /* mutex deadlock detection */
945 struct mutex_waiter *blocked_on;
947 #ifdef CONFIG_TRACE_IRQFLAGS
948 unsigned int irq_events;
949 int hardirqs_enabled;
950 unsigned long hardirq_enable_ip;
951 unsigned int hardirq_enable_event;
952 unsigned long hardirq_disable_ip;
953 unsigned int hardirq_disable_event;
954 int softirqs_enabled;
955 unsigned long softirq_disable_ip;
956 unsigned int softirq_disable_event;
957 unsigned long softirq_enable_ip;
958 unsigned int softirq_enable_event;
962 #ifdef CONFIG_LOCKDEP
963 # define MAX_LOCK_DEPTH 30UL
966 struct held_lock held_locks[MAX_LOCK_DEPTH];
967 unsigned int lockdep_recursion;
970 /* journalling filesystem info */
974 struct reclaim_state *reclaim_state;
976 struct backing_dev_info *backing_dev_info;
978 struct io_context *io_context;
981 * current io wait handle: wait queue entry to use for io waits
982 * If this thread is processing aio, this points at the waitqueue
983 * inside the currently handled kiocb. It may be NULL (i.e. default
984 * to a stack based synchronous wait) if its doing sync IO.
986 wait_queue_t *io_wait;
987 /* i/o counters(bytes read/written, #syscalls */
988 u64 rchar, wchar, syscr, syscw;
989 #if defined(CONFIG_BSD_PROCESS_ACCT)
990 u64 acct_rss_mem1; /* accumulated rss usage */
991 u64 acct_vm_mem1; /* accumulated virtual memory usage */
992 clock_t acct_stimexpd; /* clock_t-converted stime since last update */
995 struct mempolicy *mempolicy;
998 #ifdef CONFIG_CPUSETS
999 struct cpuset *cpuset;
1000 nodemask_t mems_allowed;
1001 int cpuset_mems_generation;
1002 int cpuset_mem_spread_rotor;
1004 struct robust_list_head __user *robust_list;
1005 #ifdef CONFIG_COMPAT
1006 struct compat_robust_list_head __user *compat_robust_list;
1008 struct list_head pi_state_list;
1009 struct futex_pi_state *pi_state_cache;
1011 atomic_t fs_excl; /* holding fs exclusive resources */
1012 struct rcu_head rcu;
1014 #ifdef CONFIG_PTRACE
1015 struct list_head ptracees;
1019 * cache last used pipe for splice
1021 struct pipe_inode_info *splice_pipe;
1022 #ifdef CONFIG_TASK_DELAY_ACCT
1023 struct task_delay_info *delays;
1027 static inline pid_t process_group(struct task_struct *tsk)
1029 return tsk->signal->pgrp;
1033 * pid_alive - check that a task structure is not stale
1034 * @p: Task structure to be checked.
1036 * Test if a process is not yet dead (at most zombie state)
1037 * If pid_alive fails, then pointers within the task structure
1038 * can be stale and must not be dereferenced.
1040 static inline int pid_alive(struct task_struct *p)
1042 return p->pids[PIDTYPE_PID].pid != NULL;
1045 extern void free_task(struct task_struct *tsk);
1046 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1048 extern void __put_task_struct(struct task_struct *t);
1050 static inline void put_task_struct(struct task_struct *t)
1052 if (atomic_dec_and_test(&t->usage))
1053 __put_task_struct(t);
1059 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1060 /* Not implemented yet, only for 486*/
1061 #define PF_STARTING 0x00000002 /* being created */
1062 #define PF_EXITING 0x00000004 /* getting shut down */
1063 #define PF_DEAD 0x00000008 /* Dead */
1064 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1065 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1066 #define PF_DUMPCORE 0x00000200 /* dumped core */
1067 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1068 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1069 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1070 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1071 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
1072 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1073 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1074 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1075 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1076 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1077 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1078 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1079 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1080 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1081 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1082 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1083 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1084 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1087 * Only the _current_ task can read/write to tsk->flags, but other
1088 * tasks can access tsk->flags in readonly mode for example
1089 * with tsk_used_math (like during threaded core dumping).
1090 * There is however an exception to this rule during ptrace
1091 * or during fork: the ptracer task is allowed to write to the
1092 * child->flags of its traced child (same goes for fork, the parent
1093 * can write to the child->flags), because we're guaranteed the
1094 * child is not running and in turn not changing child->flags
1095 * at the same time the parent does it.
1097 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1098 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1099 #define clear_used_math() clear_stopped_child_used_math(current)
1100 #define set_used_math() set_stopped_child_used_math(current)
1101 #define conditional_stopped_child_used_math(condition, child) \
1102 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1103 #define conditional_used_math(condition) \
1104 conditional_stopped_child_used_math(condition, current)
1105 #define copy_to_stopped_child_used_math(child) \
1106 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1107 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1108 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1109 #define used_math() tsk_used_math(current)
1112 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1114 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1116 if (!cpu_isset(0, new_mask))
1122 extern unsigned long long sched_clock(void);
1123 extern unsigned long long
1124 current_sched_time(const struct task_struct *current_task);
1126 /* sched_exec is called by processes performing an exec */
1128 extern void sched_exec(void);
1130 #define sched_exec() {}
1133 #ifdef CONFIG_HOTPLUG_CPU
1134 extern void idle_task_exit(void);
1136 static inline void idle_task_exit(void) {}
1139 extern void sched_idle_next(void);
1141 #ifdef CONFIG_RT_MUTEXES
1142 extern int rt_mutex_getprio(struct task_struct *p);
1143 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1144 extern void rt_mutex_adjust_pi(struct task_struct *p);
1146 static inline int rt_mutex_getprio(struct task_struct *p)
1148 return p->normal_prio;
1150 # define rt_mutex_adjust_pi(p) do { } while (0)
1153 extern void set_user_nice(struct task_struct *p, long nice);
1154 extern int task_prio(const struct task_struct *p);
1155 extern int task_nice(const struct task_struct *p);
1156 extern int can_nice(const struct task_struct *p, const int nice);
1157 extern int task_curr(const struct task_struct *p);
1158 extern int idle_cpu(int cpu);
1159 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1160 extern struct task_struct *idle_task(int cpu);
1161 extern struct task_struct *curr_task(int cpu);
1162 extern void set_curr_task(int cpu, struct task_struct *p);
1167 * The default (Linux) execution domain.
1169 extern struct exec_domain default_exec_domain;
1171 union thread_union {
1172 struct thread_info thread_info;
1173 unsigned long stack[THREAD_SIZE/sizeof(long)];
1176 #ifndef __HAVE_ARCH_KSTACK_END
1177 static inline int kstack_end(void *addr)
1179 /* Reliable end of stack detection:
1180 * Some APM bios versions misalign the stack
1182 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1186 extern union thread_union init_thread_union;
1187 extern struct task_struct init_task;
1189 extern struct mm_struct init_mm;
1192 #define find_task_by_real_pid(nr) \
1193 find_task_by_pid_type(PIDTYPE_REALPID, nr)
1194 #define find_task_by_pid(nr) \
1195 find_task_by_pid_type(PIDTYPE_PID, nr)
1197 extern struct task_struct *find_task_by_pid_type(int type, int pid);
1198 extern void set_special_pids(pid_t session, pid_t pgrp);
1199 extern void __set_special_pids(pid_t session, pid_t pgrp);
1201 /* per-UID process charging. */
1202 extern struct user_struct * alloc_uid(xid_t, uid_t);
1203 static inline struct user_struct *get_uid(struct user_struct *u)
1205 atomic_inc(&u->__count);
1208 extern void free_uid(struct user_struct *);
1209 extern void switch_uid(struct user_struct *);
1211 #include <asm/current.h>
1213 extern void do_timer(struct pt_regs *);
1215 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1216 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1217 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1218 unsigned long clone_flags));
1220 extern void kick_process(struct task_struct *tsk);
1222 static inline void kick_process(struct task_struct *tsk) { }
1224 extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags));
1225 extern void FASTCALL(sched_exit(struct task_struct * p));
1227 extern int in_group_p(gid_t);
1228 extern int in_egroup_p(gid_t);
1230 extern void proc_caches_init(void);
1231 extern void flush_signals(struct task_struct *);
1232 extern void flush_signal_handlers(struct task_struct *, int force_default);
1233 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1235 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1237 unsigned long flags;
1240 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1241 ret = dequeue_signal(tsk, mask, info);
1242 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1247 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1249 extern void unblock_all_signals(void);
1250 extern void release_task(struct task_struct * p);
1251 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1252 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1253 extern int force_sigsegv(int, struct task_struct *);
1254 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1255 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
1256 extern int kill_pg_info(int, struct siginfo *, pid_t);
1257 extern int kill_proc_info(int, struct siginfo *, pid_t);
1258 extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t, u32);
1259 extern void do_notify_parent(struct task_struct *, int);
1260 extern void do_notify_parent_cldstop(struct task_struct *, int);
1261 extern void force_sig(int, struct task_struct *);
1262 extern void force_sig_specific(int, struct task_struct *);
1263 extern int send_sig(int, struct task_struct *, int);
1264 extern void zap_other_threads(struct task_struct *p);
1265 extern int kill_pg(pid_t, int, int);
1266 extern int kill_proc(pid_t, int, int);
1267 extern struct sigqueue *sigqueue_alloc(void);
1268 extern void sigqueue_free(struct sigqueue *);
1269 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1270 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1271 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1272 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1274 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1275 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1276 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1277 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1279 static inline int is_si_special(const struct siginfo *info)
1281 return info <= SEND_SIG_FORCED;
1284 /* True if we are on the alternate signal stack. */
1286 static inline int on_sig_stack(unsigned long sp)
1288 return (sp - current->sas_ss_sp < current->sas_ss_size);
1291 static inline int sas_ss_flags(unsigned long sp)
1293 return (current->sas_ss_size == 0 ? SS_DISABLE
1294 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1298 * Routines for handling mm_structs
1300 extern struct mm_struct * mm_alloc(void);
1302 /* mmdrop drops the mm and the page tables */
1303 extern void FASTCALL(__mmdrop(struct mm_struct *));
1304 static inline void mmdrop(struct mm_struct * mm)
1306 if (atomic_dec_and_test(&mm->mm_count))
1310 /* mmput gets rid of the mappings and all user-space */
1311 extern void mmput(struct mm_struct *);
1312 /* Grab a reference to a task's mm, if it is not already going away */
1313 extern struct mm_struct *get_task_mm(struct task_struct *task);
1314 /* Remove the current tasks stale references to the old mm_struct */
1315 extern void mm_release(struct task_struct *, struct mm_struct *);
1317 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1318 extern void flush_thread(void);
1319 extern void exit_thread(void);
1321 extern void exit_files(struct task_struct *);
1322 extern void __cleanup_signal(struct signal_struct *);
1323 extern void __cleanup_sighand(struct sighand_struct *);
1324 extern void exit_itimers(struct signal_struct *);
1326 extern NORET_TYPE void do_group_exit(int);
1328 extern void daemonize(const char *, ...);
1329 extern int allow_signal(int);
1330 extern int disallow_signal(int);
1331 extern struct task_struct *child_reaper;
1333 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1334 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1335 struct task_struct *fork_idle(int);
1337 extern void set_task_comm(struct task_struct *tsk, char *from);
1338 extern void get_task_comm(char *to, struct task_struct *tsk);
1341 extern void wait_task_inactive(struct task_struct * p);
1343 #define wait_task_inactive(p) do { } while (0)
1346 #define remove_parent(p) list_del_init(&(p)->sibling)
1347 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1349 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1351 #define for_each_process(p) \
1352 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1355 * Careful: do_each_thread/while_each_thread is a double loop so
1356 * 'break' will not work as expected - use goto instead.
1358 #define do_each_thread(g, t) \
1359 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1361 #define while_each_thread(g, t) \
1362 while ((t = next_thread(t)) != g)
1364 /* de_thread depends on thread_group_leader not being a pid based check */
1365 #define thread_group_leader(p) (p == p->group_leader)
1367 static inline struct task_struct *next_thread(const struct task_struct *p)
1369 return list_entry(rcu_dereference(p->thread_group.next),
1370 struct task_struct, thread_group);
1373 static inline int thread_group_empty(struct task_struct *p)
1375 return list_empty(&p->thread_group);
1378 #define delay_group_leader(p) \
1379 (thread_group_leader(p) && !thread_group_empty(p))
1382 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1383 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1384 * pins the final release of task.io_context. Also protects ->cpuset.
1386 * Nests both inside and outside of read_lock(&tasklist_lock).
1387 * It must not be nested with write_lock_irq(&tasklist_lock),
1388 * neither inside nor outside.
1390 static inline void task_lock(struct task_struct *p)
1392 spin_lock(&p->alloc_lock);
1395 static inline void task_unlock(struct task_struct *p)
1397 spin_unlock(&p->alloc_lock);
1400 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1401 unsigned long *flags);
1403 static inline void unlock_task_sighand(struct task_struct *tsk,
1404 unsigned long *flags)
1406 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1409 #ifndef __HAVE_THREAD_FUNCTIONS
1411 #define task_thread_info(task) (task)->thread_info
1412 #define task_stack_page(task) ((void*)((task)->thread_info))
1414 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1416 *task_thread_info(p) = *task_thread_info(org);
1417 task_thread_info(p)->task = p;
1420 static inline unsigned long *end_of_stack(struct task_struct *p)
1422 return (unsigned long *)(p->thread_info + 1);
1427 /* set thread flags in other task's structures
1428 * - see asm/thread_info.h for TIF_xxxx flags available
1430 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1432 set_ti_thread_flag(task_thread_info(tsk), flag);
1435 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1437 clear_ti_thread_flag(task_thread_info(tsk), flag);
1440 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1442 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1445 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1447 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1450 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1452 return test_ti_thread_flag(task_thread_info(tsk), flag);
1455 static inline void set_tsk_need_resched(struct task_struct *tsk)
1457 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1460 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1462 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1465 static inline int signal_pending(struct task_struct *p)
1467 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1470 static inline int need_resched(void)
1472 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1476 * cond_resched() and cond_resched_lock(): latency reduction via
1477 * explicit rescheduling in places that are safe. The return
1478 * value indicates whether a reschedule was done in fact.
1479 * cond_resched_lock() will drop the spinlock before scheduling,
1480 * cond_resched_softirq() will enable bhs before scheduling.
1482 extern int cond_resched(void);
1483 extern int cond_resched_lock(spinlock_t * lock);
1484 extern int cond_resched_softirq(void);
1487 * Does a critical section need to be broken due to another
1490 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1491 # define need_lockbreak(lock) ((lock)->break_lock)
1493 # define need_lockbreak(lock) 0
1497 * Does a critical section need to be broken due to another
1498 * task waiting or preemption being signalled:
1500 static inline int lock_need_resched(spinlock_t *lock)
1502 if (need_lockbreak(lock) || need_resched())
1507 /* Reevaluate whether the task has signals pending delivery.
1508 This is required every time the blocked sigset_t changes.
1509 callers must hold sighand->siglock. */
1511 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1512 extern void recalc_sigpending(void);
1514 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1517 * Wrappers for p->thread_info->cpu access. No-op on UP.
1521 static inline unsigned int task_cpu(const struct task_struct *p)
1523 return task_thread_info(p)->cpu;
1526 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1528 task_thread_info(p)->cpu = cpu;
1533 static inline unsigned int task_cpu(const struct task_struct *p)
1538 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1542 #endif /* CONFIG_SMP */
1544 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1545 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1547 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1549 mm->mmap_base = TASK_UNMAPPED_BASE;
1550 mm->get_unmapped_area = arch_get_unmapped_area;
1551 mm->unmap_area = arch_unmap_area;
1555 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1556 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1558 #include <linux/sysdev.h>
1559 extern int sched_mc_power_savings, sched_smt_power_savings;
1560 extern struct sysdev_attribute attr_sched_mc_power_savings, attr_sched_smt_power_savings;
1561 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
1563 extern void normalize_rt_tasks(void);
1567 * Check if a process has been frozen
1569 static inline int frozen(struct task_struct *p)
1571 return p->flags & PF_FROZEN;
1575 * Check if there is a request to freeze a process
1577 static inline int freezing(struct task_struct *p)
1579 return p->flags & PF_FREEZE;
1583 * Request that a process be frozen
1584 * FIXME: SMP problem. We may not modify other process' flags!
1586 static inline void freeze(struct task_struct *p)
1588 p->flags |= PF_FREEZE;
1592 * Sometimes we may need to cancel the previous 'freeze' request
1594 static inline void do_not_freeze(struct task_struct *p)
1596 p->flags &= ~PF_FREEZE;
1600 * Wake up a frozen process
1602 static inline int thaw_process(struct task_struct *p)
1605 p->flags &= ~PF_FROZEN;
1613 * freezing is complete, mark process as frozen
1615 static inline void frozen_process(struct task_struct *p)
1617 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN;
1620 extern void refrigerator(void);
1621 extern int freeze_processes(void);
1622 extern void thaw_processes(void);
1624 static inline int try_to_freeze(void)
1626 if (freezing(current)) {
1633 static inline int frozen(struct task_struct *p) { return 0; }
1634 static inline int freezing(struct task_struct *p) { return 0; }
1635 static inline void freeze(struct task_struct *p) { BUG(); }
1636 static inline int thaw_process(struct task_struct *p) { return 1; }
1637 static inline void frozen_process(struct task_struct *p) { BUG(); }
1639 static inline void refrigerator(void) {}
1640 static inline int freeze_processes(void) { BUG(); return 0; }
1641 static inline void thaw_processes(void) {}
1643 static inline int try_to_freeze(void) { return 0; }
1645 #endif /* CONFIG_PM */
1646 #endif /* __KERNEL__ */