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