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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SCHED_H |
3 | #define _LINUX_SCHED_H | |
4 | ||
5eca1c10 IM |
5 | /* |
6 | * Define 'struct task_struct' and provide the main scheduler | |
7 | * APIs (schedule(), wakeup variants, etc.) | |
8 | */ | |
b7b3c76a | 9 | |
5eca1c10 | 10 | #include <uapi/linux/sched.h> |
5c228079 | 11 | |
5eca1c10 | 12 | #include <asm/current.h> |
1da177e4 | 13 | |
5eca1c10 | 14 | #include <linux/pid.h> |
1da177e4 | 15 | #include <linux/sem.h> |
ab602f79 | 16 | #include <linux/shm.h> |
5eca1c10 IM |
17 | #include <linux/kcov.h> |
18 | #include <linux/mutex.h> | |
19 | #include <linux/plist.h> | |
20 | #include <linux/hrtimer.h> | |
1da177e4 | 21 | #include <linux/seccomp.h> |
5eca1c10 | 22 | #include <linux/nodemask.h> |
b68070e1 | 23 | #include <linux/rcupdate.h> |
a3b6714e | 24 | #include <linux/resource.h> |
9745512c | 25 | #include <linux/latencytop.h> |
5eca1c10 IM |
26 | #include <linux/sched/prio.h> |
27 | #include <linux/signal_types.h> | |
eb414681 | 28 | #include <linux/psi_types.h> |
5eca1c10 IM |
29 | #include <linux/mm_types_task.h> |
30 | #include <linux/task_io_accounting.h> | |
d7822b1e | 31 | #include <linux/rseq.h> |
a3b6714e | 32 | |
5eca1c10 | 33 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 34 | struct audit_context; |
c7af7877 | 35 | struct backing_dev_info; |
bddd87c7 | 36 | struct bio_list; |
73c10101 | 37 | struct blk_plug; |
c7af7877 | 38 | struct cfs_rq; |
c7af7877 IM |
39 | struct fs_struct; |
40 | struct futex_pi_state; | |
41 | struct io_context; | |
42 | struct mempolicy; | |
89076bc3 | 43 | struct nameidata; |
c7af7877 IM |
44 | struct nsproxy; |
45 | struct perf_event_context; | |
46 | struct pid_namespace; | |
47 | struct pipe_inode_info; | |
48 | struct rcu_node; | |
49 | struct reclaim_state; | |
50 | struct robust_list_head; | |
51 | struct sched_attr; | |
52 | struct sched_param; | |
43ae34cb | 53 | struct seq_file; |
c7af7877 IM |
54 | struct sighand_struct; |
55 | struct signal_struct; | |
56 | struct task_delay_info; | |
4cf86d77 | 57 | struct task_group; |
1da177e4 | 58 | |
4a8342d2 LT |
59 | /* |
60 | * Task state bitmask. NOTE! These bits are also | |
61 | * encoded in fs/proc/array.c: get_task_state(). | |
62 | * | |
63 | * We have two separate sets of flags: task->state | |
64 | * is about runnability, while task->exit_state are | |
65 | * about the task exiting. Confusing, but this way | |
66 | * modifying one set can't modify the other one by | |
67 | * mistake. | |
68 | */ | |
5eca1c10 IM |
69 | |
70 | /* Used in tsk->state: */ | |
92c4bc9f PZ |
71 | #define TASK_RUNNING 0x0000 |
72 | #define TASK_INTERRUPTIBLE 0x0001 | |
73 | #define TASK_UNINTERRUPTIBLE 0x0002 | |
74 | #define __TASK_STOPPED 0x0004 | |
75 | #define __TASK_TRACED 0x0008 | |
5eca1c10 | 76 | /* Used in tsk->exit_state: */ |
92c4bc9f PZ |
77 | #define EXIT_DEAD 0x0010 |
78 | #define EXIT_ZOMBIE 0x0020 | |
5eca1c10 IM |
79 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
80 | /* Used in tsk->state again: */ | |
8ef9925b PZ |
81 | #define TASK_PARKED 0x0040 |
82 | #define TASK_DEAD 0x0080 | |
83 | #define TASK_WAKEKILL 0x0100 | |
84 | #define TASK_WAKING 0x0200 | |
92c4bc9f PZ |
85 | #define TASK_NOLOAD 0x0400 |
86 | #define TASK_NEW 0x0800 | |
87 | #define TASK_STATE_MAX 0x1000 | |
5eca1c10 | 88 | |
5eca1c10 IM |
89 | /* Convenience macros for the sake of set_current_state: */ |
90 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
91 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
92 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
93 | ||
94 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
95 | ||
96 | /* Convenience macros for the sake of wake_up(): */ | |
97 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
98 | |
99 | /* get_task_state(): */ | |
100 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
101 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
102 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
103 | TASK_PARKED) | |
5eca1c10 IM |
104 | |
105 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) | |
106 | ||
107 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
108 | ||
109 | #define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) | |
110 | ||
111 | #define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ | |
112 | (task->flags & PF_FROZEN) == 0 && \ | |
113 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 114 | |
8eb23b9f PZ |
115 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
116 | ||
b5bf9a90 PZ |
117 | /* |
118 | * Special states are those that do not use the normal wait-loop pattern. See | |
119 | * the comment with set_special_state(). | |
120 | */ | |
121 | #define is_special_task_state(state) \ | |
1cef1150 | 122 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 123 | |
8eb23b9f PZ |
124 | #define __set_current_state(state_value) \ |
125 | do { \ | |
b5bf9a90 | 126 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f PZ |
127 | current->task_state_change = _THIS_IP_; \ |
128 | current->state = (state_value); \ | |
129 | } while (0) | |
b5bf9a90 | 130 | |
8eb23b9f PZ |
131 | #define set_current_state(state_value) \ |
132 | do { \ | |
b5bf9a90 | 133 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f | 134 | current->task_state_change = _THIS_IP_; \ |
a2250238 | 135 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
136 | } while (0) |
137 | ||
b5bf9a90 PZ |
138 | #define set_special_state(state_value) \ |
139 | do { \ | |
140 | unsigned long flags; /* may shadow */ \ | |
141 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ | |
142 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
143 | current->task_state_change = _THIS_IP_; \ | |
144 | current->state = (state_value); \ | |
145 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ | |
146 | } while (0) | |
8eb23b9f | 147 | #else |
498d0c57 AM |
148 | /* |
149 | * set_current_state() includes a barrier so that the write of current->state | |
150 | * is correctly serialised wrt the caller's subsequent test of whether to | |
151 | * actually sleep: | |
152 | * | |
a2250238 | 153 | * for (;;) { |
498d0c57 | 154 | * set_current_state(TASK_UNINTERRUPTIBLE); |
a2250238 PZ |
155 | * if (!need_sleep) |
156 | * break; | |
157 | * | |
158 | * schedule(); | |
159 | * } | |
160 | * __set_current_state(TASK_RUNNING); | |
161 | * | |
162 | * If the caller does not need such serialisation (because, for instance, the | |
163 | * condition test and condition change and wakeup are under the same lock) then | |
164 | * use __set_current_state(). | |
165 | * | |
166 | * The above is typically ordered against the wakeup, which does: | |
167 | * | |
b5bf9a90 PZ |
168 | * need_sleep = false; |
169 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); | |
a2250238 | 170 | * |
7696f991 AP |
171 | * where wake_up_state() executes a full memory barrier before accessing the |
172 | * task state. | |
a2250238 PZ |
173 | * |
174 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
175 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
176 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 177 | * |
b5bf9a90 PZ |
178 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
179 | * also collide with the TASK_UNINTERRUPTIBLE store. Loosing that store is not | |
180 | * a problem either because that will result in one extra go around the loop | |
181 | * and our @cond test will save the day. | |
498d0c57 | 182 | * |
a2250238 | 183 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 184 | */ |
b5bf9a90 PZ |
185 | #define __set_current_state(state_value) \ |
186 | current->state = (state_value) | |
187 | ||
188 | #define set_current_state(state_value) \ | |
189 | smp_store_mb(current->state, (state_value)) | |
190 | ||
191 | /* | |
192 | * set_special_state() should be used for those states when the blocking task | |
193 | * can not use the regular condition based wait-loop. In that case we must | |
194 | * serialize against wakeups such that any possible in-flight TASK_RUNNING stores | |
195 | * will not collide with our state change. | |
196 | */ | |
197 | #define set_special_state(state_value) \ | |
198 | do { \ | |
199 | unsigned long flags; /* may shadow */ \ | |
200 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
201 | current->state = (state_value); \ | |
202 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ | |
203 | } while (0) | |
204 | ||
8eb23b9f PZ |
205 | #endif |
206 | ||
5eca1c10 IM |
207 | /* Task command name length: */ |
208 | #define TASK_COMM_LEN 16 | |
1da177e4 | 209 | |
1da177e4 LT |
210 | extern void scheduler_tick(void); |
211 | ||
5eca1c10 IM |
212 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
213 | ||
214 | extern long schedule_timeout(long timeout); | |
215 | extern long schedule_timeout_interruptible(long timeout); | |
216 | extern long schedule_timeout_killable(long timeout); | |
217 | extern long schedule_timeout_uninterruptible(long timeout); | |
218 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 219 | asmlinkage void schedule(void); |
c5491ea7 | 220 | extern void schedule_preempt_disabled(void); |
1da177e4 | 221 | |
10ab5643 TH |
222 | extern int __must_check io_schedule_prepare(void); |
223 | extern void io_schedule_finish(int token); | |
9cff8ade | 224 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 225 | extern void io_schedule(void); |
9cff8ade | 226 | |
d37f761d | 227 | /** |
0ba42a59 | 228 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
229 | * @utime: time spent in user mode |
230 | * @stime: time spent in system mode | |
9d7fb042 | 231 | * @lock: protects the above two fields |
d37f761d | 232 | * |
9d7fb042 PZ |
233 | * Stores previous user/system time values such that we can guarantee |
234 | * monotonicity. | |
d37f761d | 235 | */ |
9d7fb042 PZ |
236 | struct prev_cputime { |
237 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
238 | u64 utime; |
239 | u64 stime; | |
240 | raw_spinlock_t lock; | |
9d7fb042 | 241 | #endif |
d37f761d FW |
242 | }; |
243 | ||
f06febc9 FM |
244 | /** |
245 | * struct task_cputime - collected CPU time counts | |
5613fda9 FW |
246 | * @utime: time spent in user mode, in nanoseconds |
247 | * @stime: time spent in kernel mode, in nanoseconds | |
f06febc9 | 248 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
5ce73a4a | 249 | * |
9d7fb042 PZ |
250 | * This structure groups together three kinds of CPU time that are tracked for |
251 | * threads and thread groups. Most things considering CPU time want to group | |
252 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
253 | */ |
254 | struct task_cputime { | |
5eca1c10 IM |
255 | u64 utime; |
256 | u64 stime; | |
257 | unsigned long long sum_exec_runtime; | |
f06febc9 | 258 | }; |
9d7fb042 | 259 | |
5eca1c10 IM |
260 | /* Alternate field names when used on cache expirations: */ |
261 | #define virt_exp utime | |
262 | #define prof_exp stime | |
263 | #define sched_exp sum_exec_runtime | |
f06febc9 | 264 | |
bac5b6b6 FW |
265 | enum vtime_state { |
266 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
267 | VTIME_INACTIVE = 0, | |
268 | /* Task runs in userspace in a CPU with VTIME active: */ | |
269 | VTIME_USER, | |
270 | /* Task runs in kernelspace in a CPU with VTIME active: */ | |
271 | VTIME_SYS, | |
272 | }; | |
273 | ||
274 | struct vtime { | |
275 | seqcount_t seqcount; | |
276 | unsigned long long starttime; | |
277 | enum vtime_state state; | |
2a42eb95 WL |
278 | u64 utime; |
279 | u64 stime; | |
280 | u64 gtime; | |
bac5b6b6 FW |
281 | }; |
282 | ||
1da177e4 | 283 | struct sched_info { |
7f5f8e8d | 284 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
285 | /* Cumulative counters: */ |
286 | ||
287 | /* # of times we have run on this CPU: */ | |
288 | unsigned long pcount; | |
289 | ||
290 | /* Time spent waiting on a runqueue: */ | |
291 | unsigned long long run_delay; | |
292 | ||
293 | /* Timestamps: */ | |
294 | ||
295 | /* When did we last run on a CPU? */ | |
296 | unsigned long long last_arrival; | |
297 | ||
298 | /* When were we last queued to run? */ | |
299 | unsigned long long last_queued; | |
1da177e4 | 300 | |
f6db8347 | 301 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 302 | }; |
1da177e4 | 303 | |
6ecdd749 YD |
304 | /* |
305 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
306 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
307 | * | |
308 | * We define a basic fixed point arithmetic range, and then formalize | |
309 | * all these metrics based on that basic range. | |
310 | */ | |
5eca1c10 IM |
311 | # define SCHED_FIXEDPOINT_SHIFT 10 |
312 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 313 | |
20b8a59f | 314 | struct load_weight { |
5eca1c10 IM |
315 | unsigned long weight; |
316 | u32 inv_weight; | |
20b8a59f IM |
317 | }; |
318 | ||
7f65ea42 PB |
319 | /** |
320 | * struct util_est - Estimation utilization of FAIR tasks | |
321 | * @enqueued: instantaneous estimated utilization of a task/cpu | |
322 | * @ewma: the Exponential Weighted Moving Average (EWMA) | |
323 | * utilization of a task | |
324 | * | |
325 | * Support data structure to track an Exponential Weighted Moving Average | |
326 | * (EWMA) of a FAIR task's utilization. New samples are added to the moving | |
327 | * average each time a task completes an activation. Sample's weight is chosen | |
328 | * so that the EWMA will be relatively insensitive to transient changes to the | |
329 | * task's workload. | |
330 | * | |
331 | * The enqueued attribute has a slightly different meaning for tasks and cpus: | |
332 | * - task: the task's util_avg at last task dequeue time | |
333 | * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU | |
334 | * Thus, the util_est.enqueued of a task represents the contribution on the | |
335 | * estimated utilization of the CPU where that task is currently enqueued. | |
336 | * | |
337 | * Only for tasks we track a moving average of the past instantaneous | |
338 | * estimated utilization. This allows to absorb sporadic drops in utilization | |
339 | * of an otherwise almost periodic task. | |
340 | */ | |
341 | struct util_est { | |
342 | unsigned int enqueued; | |
343 | unsigned int ewma; | |
344 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
317d359d | 345 | } __attribute__((__aligned__(sizeof(u64)))); |
7f65ea42 | 346 | |
9d89c257 | 347 | /* |
7b595334 YD |
348 | * The load_avg/util_avg accumulates an infinite geometric series |
349 | * (see __update_load_avg() in kernel/sched/fair.c). | |
350 | * | |
351 | * [load_avg definition] | |
352 | * | |
353 | * load_avg = runnable% * scale_load_down(load) | |
354 | * | |
355 | * where runnable% is the time ratio that a sched_entity is runnable. | |
356 | * For cfs_rq, it is the aggregated load_avg of all runnable and | |
9d89c257 | 357 | * blocked sched_entities. |
7b595334 YD |
358 | * |
359 | * load_avg may also take frequency scaling into account: | |
360 | * | |
361 | * load_avg = runnable% * scale_load_down(load) * freq% | |
362 | * | |
363 | * where freq% is the CPU frequency normalized to the highest frequency. | |
364 | * | |
365 | * [util_avg definition] | |
366 | * | |
367 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
368 | * | |
369 | * where running% is the time ratio that a sched_entity is running on | |
370 | * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable | |
371 | * and blocked sched_entities. | |
372 | * | |
373 | * util_avg may also factor frequency scaling and CPU capacity scaling: | |
374 | * | |
375 | * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity% | |
376 | * | |
377 | * where freq% is the same as above, and capacity% is the CPU capacity | |
378 | * normalized to the greatest capacity (due to uarch differences, etc). | |
379 | * | |
380 | * N.B., the above ratios (runnable%, running%, freq%, and capacity%) | |
381 | * themselves are in the range of [0, 1]. To do fixed point arithmetics, | |
382 | * we therefore scale them to as large a range as necessary. This is for | |
383 | * example reflected by util_avg's SCHED_CAPACITY_SCALE. | |
384 | * | |
385 | * [Overflow issue] | |
386 | * | |
387 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
388 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
389 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
390 | * | |
391 | * For all other cases (including 32-bit kernels), struct load_weight's | |
392 | * weight will overflow first before we do, because: | |
393 | * | |
394 | * Max(load_avg) <= Max(load.weight) | |
395 | * | |
396 | * Then it is the load_weight's responsibility to consider overflow | |
397 | * issues. | |
9d89c257 | 398 | */ |
9d85f21c | 399 | struct sched_avg { |
5eca1c10 IM |
400 | u64 last_update_time; |
401 | u64 load_sum; | |
1ea6c46a | 402 | u64 runnable_load_sum; |
5eca1c10 IM |
403 | u32 util_sum; |
404 | u32 period_contrib; | |
405 | unsigned long load_avg; | |
1ea6c46a | 406 | unsigned long runnable_load_avg; |
5eca1c10 | 407 | unsigned long util_avg; |
7f65ea42 | 408 | struct util_est util_est; |
317d359d | 409 | } ____cacheline_aligned; |
9d85f21c | 410 | |
41acab88 | 411 | struct sched_statistics { |
7f5f8e8d | 412 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
413 | u64 wait_start; |
414 | u64 wait_max; | |
415 | u64 wait_count; | |
416 | u64 wait_sum; | |
417 | u64 iowait_count; | |
418 | u64 iowait_sum; | |
419 | ||
420 | u64 sleep_start; | |
421 | u64 sleep_max; | |
422 | s64 sum_sleep_runtime; | |
423 | ||
424 | u64 block_start; | |
425 | u64 block_max; | |
426 | u64 exec_max; | |
427 | u64 slice_max; | |
428 | ||
429 | u64 nr_migrations_cold; | |
430 | u64 nr_failed_migrations_affine; | |
431 | u64 nr_failed_migrations_running; | |
432 | u64 nr_failed_migrations_hot; | |
433 | u64 nr_forced_migrations; | |
434 | ||
435 | u64 nr_wakeups; | |
436 | u64 nr_wakeups_sync; | |
437 | u64 nr_wakeups_migrate; | |
438 | u64 nr_wakeups_local; | |
439 | u64 nr_wakeups_remote; | |
440 | u64 nr_wakeups_affine; | |
441 | u64 nr_wakeups_affine_attempts; | |
442 | u64 nr_wakeups_passive; | |
443 | u64 nr_wakeups_idle; | |
41acab88 | 444 | #endif |
7f5f8e8d | 445 | }; |
41acab88 LDM |
446 | |
447 | struct sched_entity { | |
5eca1c10 IM |
448 | /* For load-balancing: */ |
449 | struct load_weight load; | |
1ea6c46a | 450 | unsigned long runnable_weight; |
5eca1c10 IM |
451 | struct rb_node run_node; |
452 | struct list_head group_node; | |
453 | unsigned int on_rq; | |
41acab88 | 454 | |
5eca1c10 IM |
455 | u64 exec_start; |
456 | u64 sum_exec_runtime; | |
457 | u64 vruntime; | |
458 | u64 prev_sum_exec_runtime; | |
41acab88 | 459 | |
5eca1c10 | 460 | u64 nr_migrations; |
41acab88 | 461 | |
5eca1c10 | 462 | struct sched_statistics statistics; |
94c18227 | 463 | |
20b8a59f | 464 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
465 | int depth; |
466 | struct sched_entity *parent; | |
20b8a59f | 467 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 468 | struct cfs_rq *cfs_rq; |
20b8a59f | 469 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 470 | struct cfs_rq *my_q; |
20b8a59f | 471 | #endif |
8bd75c77 | 472 | |
141965c7 | 473 | #ifdef CONFIG_SMP |
5a107804 JO |
474 | /* |
475 | * Per entity load average tracking. | |
476 | * | |
477 | * Put into separate cache line so it does not | |
478 | * collide with read-mostly values above. | |
479 | */ | |
317d359d | 480 | struct sched_avg avg; |
9d85f21c | 481 | #endif |
20b8a59f | 482 | }; |
70b97a7f | 483 | |
fa717060 | 484 | struct sched_rt_entity { |
5eca1c10 IM |
485 | struct list_head run_list; |
486 | unsigned long timeout; | |
487 | unsigned long watchdog_stamp; | |
488 | unsigned int time_slice; | |
489 | unsigned short on_rq; | |
490 | unsigned short on_list; | |
491 | ||
492 | struct sched_rt_entity *back; | |
052f1dc7 | 493 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 494 | struct sched_rt_entity *parent; |
6f505b16 | 495 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 496 | struct rt_rq *rt_rq; |
6f505b16 | 497 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 498 | struct rt_rq *my_q; |
6f505b16 | 499 | #endif |
3859a271 | 500 | } __randomize_layout; |
fa717060 | 501 | |
aab03e05 | 502 | struct sched_dl_entity { |
5eca1c10 | 503 | struct rb_node rb_node; |
aab03e05 DF |
504 | |
505 | /* | |
506 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 507 | * during sched_setattr(), they will remain the same until |
508 | * the next sched_setattr(). | |
aab03e05 | 509 | */ |
5eca1c10 IM |
510 | u64 dl_runtime; /* Maximum runtime for each instance */ |
511 | u64 dl_deadline; /* Relative deadline of each instance */ | |
512 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 513 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 514 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
515 | |
516 | /* | |
517 | * Actual scheduling parameters. Initialized with the values above, | |
518 | * they are continously updated during task execution. Note that | |
519 | * the remaining runtime could be < 0 in case we are in overrun. | |
520 | */ | |
5eca1c10 IM |
521 | s64 runtime; /* Remaining runtime for this instance */ |
522 | u64 deadline; /* Absolute deadline for this instance */ | |
523 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
524 | |
525 | /* | |
526 | * Some bool flags: | |
527 | * | |
528 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
529 | * task has to wait for a replenishment to be performed at the | |
530 | * next firing of dl_timer. | |
531 | * | |
2d3d891d DF |
532 | * @dl_boosted tells if we are boosted due to DI. If so we are |
533 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
534 | * exit the critical section); |
535 | * | |
5eca1c10 | 536 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 537 | * all its available runtime during the last job. |
209a0cbd LA |
538 | * |
539 | * @dl_non_contending tells if the task is inactive while still | |
540 | * contributing to the active utilization. In other words, it | |
541 | * indicates if the inactive timer has been armed and its handler | |
542 | * has not been executed yet. This flag is useful to avoid race | |
543 | * conditions between the inactive timer handler and the wakeup | |
544 | * code. | |
34be3930 JL |
545 | * |
546 | * @dl_overrun tells if the task asked to be informed about runtime | |
547 | * overruns. | |
aab03e05 | 548 | */ |
aa5222e9 DC |
549 | unsigned int dl_throttled : 1; |
550 | unsigned int dl_boosted : 1; | |
551 | unsigned int dl_yielded : 1; | |
552 | unsigned int dl_non_contending : 1; | |
34be3930 | 553 | unsigned int dl_overrun : 1; |
aab03e05 DF |
554 | |
555 | /* | |
556 | * Bandwidth enforcement timer. Each -deadline task has its | |
557 | * own bandwidth to be enforced, thus we need one timer per task. | |
558 | */ | |
5eca1c10 | 559 | struct hrtimer dl_timer; |
209a0cbd LA |
560 | |
561 | /* | |
562 | * Inactive timer, responsible for decreasing the active utilization | |
563 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
564 | * to GRUB's active utilization until the "0-lag time", hence a | |
565 | * timer is needed to decrease the active utilization at the correct | |
566 | * time. | |
567 | */ | |
568 | struct hrtimer inactive_timer; | |
aab03e05 | 569 | }; |
8bd75c77 | 570 | |
1d082fd0 PM |
571 | union rcu_special { |
572 | struct { | |
5eca1c10 IM |
573 | u8 blocked; |
574 | u8 need_qs; | |
8203d6d0 | 575 | } b; /* Bits. */ |
fcc878e4 | 576 | u16 s; /* Set of bits. */ |
1d082fd0 | 577 | }; |
86848966 | 578 | |
8dc85d54 PZ |
579 | enum perf_event_task_context { |
580 | perf_invalid_context = -1, | |
581 | perf_hw_context = 0, | |
89a1e187 | 582 | perf_sw_context, |
8dc85d54 PZ |
583 | perf_nr_task_contexts, |
584 | }; | |
585 | ||
eb61baf6 IM |
586 | struct wake_q_node { |
587 | struct wake_q_node *next; | |
588 | }; | |
589 | ||
1da177e4 | 590 | struct task_struct { |
c65eacbe AL |
591 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
592 | /* | |
593 | * For reasons of header soup (see current_thread_info()), this | |
594 | * must be the first element of task_struct. | |
595 | */ | |
5eca1c10 | 596 | struct thread_info thread_info; |
c65eacbe | 597 | #endif |
5eca1c10 IM |
598 | /* -1 unrunnable, 0 runnable, >0 stopped: */ |
599 | volatile long state; | |
29e48ce8 KC |
600 | |
601 | /* | |
602 | * This begins the randomizable portion of task_struct. Only | |
603 | * scheduling-critical items should be added above here. | |
604 | */ | |
605 | randomized_struct_fields_start | |
606 | ||
5eca1c10 IM |
607 | void *stack; |
608 | atomic_t usage; | |
609 | /* Per task flags (PF_*), defined further below: */ | |
610 | unsigned int flags; | |
611 | unsigned int ptrace; | |
1da177e4 | 612 | |
2dd73a4f | 613 | #ifdef CONFIG_SMP |
5eca1c10 IM |
614 | struct llist_node wake_entry; |
615 | int on_cpu; | |
c65eacbe | 616 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
617 | /* Current CPU: */ |
618 | unsigned int cpu; | |
c65eacbe | 619 | #endif |
5eca1c10 IM |
620 | unsigned int wakee_flips; |
621 | unsigned long wakee_flip_decay_ts; | |
622 | struct task_struct *last_wakee; | |
ac66f547 | 623 | |
32e839dd MG |
624 | /* |
625 | * recent_used_cpu is initially set as the last CPU used by a task | |
626 | * that wakes affine another task. Waker/wakee relationships can | |
627 | * push tasks around a CPU where each wakeup moves to the next one. | |
628 | * Tracking a recently used CPU allows a quick search for a recently | |
629 | * used CPU that may be idle. | |
630 | */ | |
631 | int recent_used_cpu; | |
5eca1c10 | 632 | int wake_cpu; |
2dd73a4f | 633 | #endif |
5eca1c10 IM |
634 | int on_rq; |
635 | ||
636 | int prio; | |
637 | int static_prio; | |
638 | int normal_prio; | |
639 | unsigned int rt_priority; | |
50e645a8 | 640 | |
5eca1c10 IM |
641 | const struct sched_class *sched_class; |
642 | struct sched_entity se; | |
643 | struct sched_rt_entity rt; | |
8323f26c | 644 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 645 | struct task_group *sched_task_group; |
8323f26c | 646 | #endif |
5eca1c10 | 647 | struct sched_dl_entity dl; |
1da177e4 | 648 | |
e107be36 | 649 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
650 | /* List of struct preempt_notifier: */ |
651 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
652 | #endif |
653 | ||
6c5c9341 | 654 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 655 | unsigned int btrace_seq; |
6c5c9341 | 656 | #endif |
1da177e4 | 657 | |
5eca1c10 IM |
658 | unsigned int policy; |
659 | int nr_cpus_allowed; | |
660 | cpumask_t cpus_allowed; | |
1da177e4 | 661 | |
a57eb940 | 662 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
663 | int rcu_read_lock_nesting; |
664 | union rcu_special rcu_read_unlock_special; | |
665 | struct list_head rcu_node_entry; | |
666 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 667 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 668 | |
8315f422 | 669 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 670 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
671 | u8 rcu_tasks_holdout; |
672 | u8 rcu_tasks_idx; | |
5eca1c10 | 673 | int rcu_tasks_idle_cpu; |
ccdd29ff | 674 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 675 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 676 | |
5eca1c10 | 677 | struct sched_info sched_info; |
1da177e4 | 678 | |
5eca1c10 | 679 | struct list_head tasks; |
806c09a7 | 680 | #ifdef CONFIG_SMP |
5eca1c10 IM |
681 | struct plist_node pushable_tasks; |
682 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 683 | #endif |
1da177e4 | 684 | |
5eca1c10 IM |
685 | struct mm_struct *mm; |
686 | struct mm_struct *active_mm; | |
314ff785 IM |
687 | |
688 | /* Per-thread vma caching: */ | |
5eca1c10 | 689 | struct vmacache vmacache; |
314ff785 | 690 | |
5eca1c10 IM |
691 | #ifdef SPLIT_RSS_COUNTING |
692 | struct task_rss_stat rss_stat; | |
34e55232 | 693 | #endif |
5eca1c10 IM |
694 | int exit_state; |
695 | int exit_code; | |
696 | int exit_signal; | |
697 | /* The signal sent when the parent dies: */ | |
698 | int pdeath_signal; | |
699 | /* JOBCTL_*, siglock protected: */ | |
700 | unsigned long jobctl; | |
701 | ||
702 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
703 | unsigned int personality; | |
704 | ||
705 | /* Scheduler bits, serialized by scheduler locks: */ | |
706 | unsigned sched_reset_on_fork:1; | |
707 | unsigned sched_contributes_to_load:1; | |
708 | unsigned sched_migrated:1; | |
709 | unsigned sched_remote_wakeup:1; | |
eb414681 JW |
710 | #ifdef CONFIG_PSI |
711 | unsigned sched_psi_wake_requeue:1; | |
712 | #endif | |
713 | ||
5eca1c10 IM |
714 | /* Force alignment to the next boundary: */ |
715 | unsigned :0; | |
716 | ||
717 | /* Unserialized, strictly 'current' */ | |
718 | ||
719 | /* Bit to tell LSMs we're in execve(): */ | |
720 | unsigned in_execve:1; | |
721 | unsigned in_iowait:1; | |
722 | #ifndef TIF_RESTORE_SIGMASK | |
723 | unsigned restore_sigmask:1; | |
7e781418 | 724 | #endif |
626ebc41 | 725 | #ifdef CONFIG_MEMCG |
29ef680a | 726 | unsigned in_user_fault:1; |
127424c8 | 727 | #endif |
ff303e66 | 728 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 729 | unsigned brk_randomized:1; |
ff303e66 | 730 | #endif |
77f88796 TH |
731 | #ifdef CONFIG_CGROUPS |
732 | /* disallow userland-initiated cgroup migration */ | |
733 | unsigned no_cgroup_migration:1; | |
734 | #endif | |
d09d8df3 JB |
735 | #ifdef CONFIG_BLK_CGROUP |
736 | /* to be used once the psi infrastructure lands upstream. */ | |
737 | unsigned use_memdelay:1; | |
738 | #endif | |
6f185c29 | 739 | |
9da3f2b7 JH |
740 | /* |
741 | * May usercopy functions fault on kernel addresses? | |
742 | * This is not just a single bit because this can potentially nest. | |
743 | */ | |
744 | unsigned int kernel_uaccess_faults_ok; | |
745 | ||
5eca1c10 | 746 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 747 | |
5eca1c10 | 748 | struct restart_block restart_block; |
f56141e3 | 749 | |
5eca1c10 IM |
750 | pid_t pid; |
751 | pid_t tgid; | |
0a425405 | 752 | |
050e9baa | 753 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
754 | /* Canary value for the -fstack-protector GCC feature: */ |
755 | unsigned long stack_canary; | |
1314562a | 756 | #endif |
4d1d61a6 | 757 | /* |
5eca1c10 | 758 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 759 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 760 | * p->real_parent->pid) |
1da177e4 | 761 | */ |
5eca1c10 IM |
762 | |
763 | /* Real parent process: */ | |
764 | struct task_struct __rcu *real_parent; | |
765 | ||
766 | /* Recipient of SIGCHLD, wait4() reports: */ | |
767 | struct task_struct __rcu *parent; | |
768 | ||
1da177e4 | 769 | /* |
5eca1c10 | 770 | * Children/sibling form the list of natural children: |
1da177e4 | 771 | */ |
5eca1c10 IM |
772 | struct list_head children; |
773 | struct list_head sibling; | |
774 | struct task_struct *group_leader; | |
1da177e4 | 775 | |
f470021a | 776 | /* |
5eca1c10 IM |
777 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
778 | * | |
f470021a | 779 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 780 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 781 | */ |
5eca1c10 IM |
782 | struct list_head ptraced; |
783 | struct list_head ptrace_entry; | |
f470021a | 784 | |
1da177e4 | 785 | /* PID/PID hash table linkage. */ |
2c470475 EB |
786 | struct pid *thread_pid; |
787 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
788 | struct list_head thread_group; |
789 | struct list_head thread_node; | |
790 | ||
791 | struct completion *vfork_done; | |
1da177e4 | 792 | |
5eca1c10 IM |
793 | /* CLONE_CHILD_SETTID: */ |
794 | int __user *set_child_tid; | |
1da177e4 | 795 | |
5eca1c10 IM |
796 | /* CLONE_CHILD_CLEARTID: */ |
797 | int __user *clear_child_tid; | |
798 | ||
799 | u64 utime; | |
800 | u64 stime; | |
40565b5a | 801 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
802 | u64 utimescaled; |
803 | u64 stimescaled; | |
40565b5a | 804 | #endif |
5eca1c10 IM |
805 | u64 gtime; |
806 | struct prev_cputime prev_cputime; | |
6a61671b | 807 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 808 | struct vtime vtime; |
d99ca3b9 | 809 | #endif |
d027d45d FW |
810 | |
811 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 812 | atomic_t tick_dep_mask; |
d027d45d | 813 | #endif |
5eca1c10 IM |
814 | /* Context switch counts: */ |
815 | unsigned long nvcsw; | |
816 | unsigned long nivcsw; | |
817 | ||
818 | /* Monotonic time in nsecs: */ | |
819 | u64 start_time; | |
820 | ||
821 | /* Boot based time in nsecs: */ | |
822 | u64 real_start_time; | |
823 | ||
824 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
825 | unsigned long min_flt; | |
826 | unsigned long maj_flt; | |
1da177e4 | 827 | |
b18b6a9c | 828 | #ifdef CONFIG_POSIX_TIMERS |
5eca1c10 IM |
829 | struct task_cputime cputime_expires; |
830 | struct list_head cpu_timers[3]; | |
b18b6a9c | 831 | #endif |
1da177e4 | 832 | |
5eca1c10 IM |
833 | /* Process credentials: */ |
834 | ||
835 | /* Tracer's credentials at attach: */ | |
836 | const struct cred __rcu *ptracer_cred; | |
837 | ||
838 | /* Objective and real subjective task credentials (COW): */ | |
839 | const struct cred __rcu *real_cred; | |
840 | ||
841 | /* Effective (overridable) subjective task credentials (COW): */ | |
842 | const struct cred __rcu *cred; | |
843 | ||
844 | /* | |
845 | * executable name, excluding path. | |
846 | * | |
847 | * - normally initialized setup_new_exec() | |
848 | * - access it with [gs]et_task_comm() | |
849 | * - lock it with task_lock() | |
850 | */ | |
851 | char comm[TASK_COMM_LEN]; | |
852 | ||
853 | struct nameidata *nameidata; | |
854 | ||
3d5b6fcc | 855 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
856 | struct sysv_sem sysvsem; |
857 | struct sysv_shm sysvshm; | |
3d5b6fcc | 858 | #endif |
e162b39a | 859 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 860 | unsigned long last_switch_count; |
a2e51445 | 861 | unsigned long last_switch_time; |
82a1fcb9 | 862 | #endif |
5eca1c10 IM |
863 | /* Filesystem information: */ |
864 | struct fs_struct *fs; | |
865 | ||
866 | /* Open file information: */ | |
867 | struct files_struct *files; | |
868 | ||
869 | /* Namespaces: */ | |
870 | struct nsproxy *nsproxy; | |
871 | ||
872 | /* Signal handlers: */ | |
873 | struct signal_struct *signal; | |
874 | struct sighand_struct *sighand; | |
875 | sigset_t blocked; | |
876 | sigset_t real_blocked; | |
877 | /* Restored if set_restore_sigmask() was used: */ | |
878 | sigset_t saved_sigmask; | |
879 | struct sigpending pending; | |
880 | unsigned long sas_ss_sp; | |
881 | size_t sas_ss_size; | |
882 | unsigned int sas_ss_flags; | |
883 | ||
884 | struct callback_head *task_works; | |
885 | ||
886 | struct audit_context *audit_context; | |
bfef93a5 | 887 | #ifdef CONFIG_AUDITSYSCALL |
5eca1c10 IM |
888 | kuid_t loginuid; |
889 | unsigned int sessionid; | |
bfef93a5 | 890 | #endif |
5eca1c10 IM |
891 | struct seccomp seccomp; |
892 | ||
893 | /* Thread group tracking: */ | |
894 | u32 parent_exec_id; | |
895 | u32 self_exec_id; | |
1da177e4 | 896 | |
5eca1c10 IM |
897 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
898 | spinlock_t alloc_lock; | |
1da177e4 | 899 | |
b29739f9 | 900 | /* Protection of the PI data structures: */ |
5eca1c10 | 901 | raw_spinlock_t pi_lock; |
b29739f9 | 902 | |
5eca1c10 | 903 | struct wake_q_node wake_q; |
76751049 | 904 | |
23f78d4a | 905 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 906 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 907 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
908 | /* Updated under owner's pi_lock and rq lock */ |
909 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
910 | /* Deadlock detection and priority inheritance handling: */ |
911 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
912 | #endif |
913 | ||
408894ee | 914 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
915 | /* Mutex deadlock detection: */ |
916 | struct mutex_waiter *blocked_on; | |
408894ee | 917 | #endif |
5eca1c10 | 918 | |
de30a2b3 | 919 | #ifdef CONFIG_TRACE_IRQFLAGS |
5eca1c10 IM |
920 | unsigned int irq_events; |
921 | unsigned long hardirq_enable_ip; | |
922 | unsigned long hardirq_disable_ip; | |
923 | unsigned int hardirq_enable_event; | |
924 | unsigned int hardirq_disable_event; | |
925 | int hardirqs_enabled; | |
926 | int hardirq_context; | |
927 | unsigned long softirq_disable_ip; | |
928 | unsigned long softirq_enable_ip; | |
929 | unsigned int softirq_disable_event; | |
930 | unsigned int softirq_enable_event; | |
931 | int softirqs_enabled; | |
932 | int softirq_context; | |
de30a2b3 | 933 | #endif |
5eca1c10 | 934 | |
fbb9ce95 | 935 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
936 | # define MAX_LOCK_DEPTH 48UL |
937 | u64 curr_chain_key; | |
938 | int lockdep_depth; | |
939 | unsigned int lockdep_recursion; | |
940 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 941 | #endif |
5eca1c10 | 942 | |
c6d30853 | 943 | #ifdef CONFIG_UBSAN |
5eca1c10 | 944 | unsigned int in_ubsan; |
c6d30853 | 945 | #endif |
408894ee | 946 | |
5eca1c10 IM |
947 | /* Journalling filesystem info: */ |
948 | void *journal_info; | |
1da177e4 | 949 | |
5eca1c10 IM |
950 | /* Stacked block device info: */ |
951 | struct bio_list *bio_list; | |
d89d8796 | 952 | |
73c10101 | 953 | #ifdef CONFIG_BLOCK |
5eca1c10 IM |
954 | /* Stack plugging: */ |
955 | struct blk_plug *plug; | |
73c10101 JA |
956 | #endif |
957 | ||
5eca1c10 IM |
958 | /* VM state: */ |
959 | struct reclaim_state *reclaim_state; | |
960 | ||
961 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 962 | |
5eca1c10 | 963 | struct io_context *io_context; |
1da177e4 | 964 | |
5eca1c10 IM |
965 | /* Ptrace state: */ |
966 | unsigned long ptrace_message; | |
ae7795bc | 967 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 968 | |
5eca1c10 | 969 | struct task_io_accounting ioac; |
eb414681 JW |
970 | #ifdef CONFIG_PSI |
971 | /* Pressure stall state */ | |
972 | unsigned int psi_flags; | |
973 | #endif | |
5eca1c10 IM |
974 | #ifdef CONFIG_TASK_XACCT |
975 | /* Accumulated RSS usage: */ | |
976 | u64 acct_rss_mem1; | |
977 | /* Accumulated virtual memory usage: */ | |
978 | u64 acct_vm_mem1; | |
979 | /* stime + utime since last update: */ | |
980 | u64 acct_timexpd; | |
1da177e4 LT |
981 | #endif |
982 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
983 | /* Protected by ->alloc_lock: */ |
984 | nodemask_t mems_allowed; | |
985 | /* Seqence number to catch updates: */ | |
986 | seqcount_t mems_allowed_seq; | |
987 | int cpuset_mem_spread_rotor; | |
988 | int cpuset_slab_spread_rotor; | |
1da177e4 | 989 | #endif |
ddbcc7e8 | 990 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
991 | /* Control Group info protected by css_set_lock: */ |
992 | struct css_set __rcu *cgroups; | |
993 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
994 | struct list_head cg_list; | |
ddbcc7e8 | 995 | #endif |
f01d7d51 | 996 | #ifdef CONFIG_INTEL_RDT |
0734ded1 | 997 | u32 closid; |
d6aaba61 | 998 | u32 rmid; |
e02737d5 | 999 | #endif |
42b2dd0a | 1000 | #ifdef CONFIG_FUTEX |
5eca1c10 | 1001 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1002 | #ifdef CONFIG_COMPAT |
1003 | struct compat_robust_list_head __user *compat_robust_list; | |
1004 | #endif | |
5eca1c10 IM |
1005 | struct list_head pi_state_list; |
1006 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1007 | #endif |
cdd6c482 | 1008 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
1009 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
1010 | struct mutex perf_event_mutex; | |
1011 | struct list_head perf_event_list; | |
a63eaf34 | 1012 | #endif |
8f47b187 | 1013 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1014 | unsigned long preempt_disable_ip; |
8f47b187 | 1015 | #endif |
c7aceaba | 1016 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1017 | /* Protected by alloc_lock: */ |
1018 | struct mempolicy *mempolicy; | |
45816682 | 1019 | short il_prev; |
5eca1c10 | 1020 | short pref_node_fork; |
42b2dd0a | 1021 | #endif |
cbee9f88 | 1022 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1023 | int numa_scan_seq; |
1024 | unsigned int numa_scan_period; | |
1025 | unsigned int numa_scan_period_max; | |
1026 | int numa_preferred_nid; | |
1027 | unsigned long numa_migrate_retry; | |
1028 | /* Migration stamp: */ | |
1029 | u64 node_stamp; | |
1030 | u64 last_task_numa_placement; | |
1031 | u64 last_sum_exec_runtime; | |
1032 | struct callback_head numa_work; | |
1033 | ||
5eca1c10 | 1034 | struct numa_group *numa_group; |
8c8a743c | 1035 | |
745d6147 | 1036 | /* |
44dba3d5 IM |
1037 | * numa_faults is an array split into four regions: |
1038 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1039 | * in this precise order. | |
1040 | * | |
1041 | * faults_memory: Exponential decaying average of faults on a per-node | |
1042 | * basis. Scheduling placement decisions are made based on these | |
1043 | * counts. The values remain static for the duration of a PTE scan. | |
1044 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1045 | * hinting fault was incurred. | |
1046 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1047 | * during the current scan window. When the scan completes, the counts | |
1048 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1049 | */ |
5eca1c10 IM |
1050 | unsigned long *numa_faults; |
1051 | unsigned long total_numa_faults; | |
745d6147 | 1052 | |
04bb2f94 RR |
1053 | /* |
1054 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1055 | * scan window were remote/local or failed to migrate. The task scan |
1056 | * period is adapted based on the locality of the faults with different | |
1057 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1058 | */ |
5eca1c10 | 1059 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1060 | |
5eca1c10 | 1061 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1062 | #endif /* CONFIG_NUMA_BALANCING */ |
1063 | ||
d7822b1e MD |
1064 | #ifdef CONFIG_RSEQ |
1065 | struct rseq __user *rseq; | |
1066 | u32 rseq_len; | |
1067 | u32 rseq_sig; | |
1068 | /* | |
1069 | * RmW on rseq_event_mask must be performed atomically | |
1070 | * with respect to preemption. | |
1071 | */ | |
1072 | unsigned long rseq_event_mask; | |
1073 | #endif | |
1074 | ||
5eca1c10 | 1075 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1076 | |
5eca1c10 | 1077 | struct rcu_head rcu; |
b92ce558 | 1078 | |
5eca1c10 IM |
1079 | /* Cache last used pipe for splice(): */ |
1080 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1081 | |
5eca1c10 | 1082 | struct page_frag task_frag; |
5640f768 | 1083 | |
47913d4e IM |
1084 | #ifdef CONFIG_TASK_DELAY_ACCT |
1085 | struct task_delay_info *delays; | |
f4f154fd | 1086 | #endif |
47913d4e | 1087 | |
f4f154fd | 1088 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1089 | int make_it_fail; |
9049f2f6 | 1090 | unsigned int fail_nth; |
ca74e92b | 1091 | #endif |
9d823e8f | 1092 | /* |
5eca1c10 IM |
1093 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1094 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1095 | */ |
5eca1c10 IM |
1096 | int nr_dirtied; |
1097 | int nr_dirtied_pause; | |
1098 | /* Start of a write-and-pause period: */ | |
1099 | unsigned long dirty_paused_when; | |
9d823e8f | 1100 | |
9745512c | 1101 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1102 | int latency_record_count; |
1103 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1104 | #endif |
6976675d | 1105 | /* |
5eca1c10 | 1106 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1107 | * select() etc timeout values. These are in nanoseconds. |
1108 | */ | |
5eca1c10 IM |
1109 | u64 timer_slack_ns; |
1110 | u64 default_timer_slack_ns; | |
f8d570a4 | 1111 | |
0b24becc | 1112 | #ifdef CONFIG_KASAN |
5eca1c10 | 1113 | unsigned int kasan_depth; |
0b24becc | 1114 | #endif |
5eca1c10 | 1115 | |
fb52607a | 1116 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1117 | /* Index of current stored address in ret_stack: */ |
1118 | int curr_ret_stack; | |
1119 | ||
1120 | /* Stack of return addresses for return function tracing: */ | |
1121 | struct ftrace_ret_stack *ret_stack; | |
1122 | ||
1123 | /* Timestamp for last schedule: */ | |
1124 | unsigned long long ftrace_timestamp; | |
1125 | ||
f201ae23 FW |
1126 | /* |
1127 | * Number of functions that haven't been traced | |
5eca1c10 | 1128 | * because of depth overrun: |
f201ae23 | 1129 | */ |
5eca1c10 IM |
1130 | atomic_t trace_overrun; |
1131 | ||
1132 | /* Pause tracing: */ | |
1133 | atomic_t tracing_graph_pause; | |
f201ae23 | 1134 | #endif |
5eca1c10 | 1135 | |
ea4e2bc4 | 1136 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1137 | /* State flags for use by tracers: */ |
1138 | unsigned long trace; | |
1139 | ||
1140 | /* Bitmask and counter of trace recursion: */ | |
1141 | unsigned long trace_recursion; | |
261842b7 | 1142 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1143 | |
5c9a8750 | 1144 | #ifdef CONFIG_KCOV |
5eca1c10 | 1145 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1146 | unsigned int kcov_mode; |
5eca1c10 IM |
1147 | |
1148 | /* Size of the kcov_area: */ | |
1149 | unsigned int kcov_size; | |
1150 | ||
1151 | /* Buffer for coverage collection: */ | |
1152 | void *kcov_area; | |
1153 | ||
1154 | /* KCOV descriptor wired with this task or NULL: */ | |
1155 | struct kcov *kcov; | |
5c9a8750 | 1156 | #endif |
5eca1c10 | 1157 | |
6f185c29 | 1158 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1159 | struct mem_cgroup *memcg_in_oom; |
1160 | gfp_t memcg_oom_gfp_mask; | |
1161 | int memcg_oom_order; | |
b23afb93 | 1162 | |
5eca1c10 IM |
1163 | /* Number of pages to reclaim on returning to userland: */ |
1164 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1165 | |
1166 | /* Used by memcontrol for targeted memcg charge: */ | |
1167 | struct mem_cgroup *active_memcg; | |
569b846d | 1168 | #endif |
5eca1c10 | 1169 | |
d09d8df3 JB |
1170 | #ifdef CONFIG_BLK_CGROUP |
1171 | struct request_queue *throttle_queue; | |
1172 | #endif | |
1173 | ||
0326f5a9 | 1174 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1175 | struct uprobe_task *utask; |
0326f5a9 | 1176 | #endif |
cafe5635 | 1177 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1178 | unsigned int sequential_io; |
1179 | unsigned int sequential_io_avg; | |
cafe5635 | 1180 | #endif |
8eb23b9f | 1181 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1182 | unsigned long task_state_change; |
8eb23b9f | 1183 | #endif |
5eca1c10 | 1184 | int pagefault_disabled; |
03049269 | 1185 | #ifdef CONFIG_MMU |
5eca1c10 | 1186 | struct task_struct *oom_reaper_list; |
03049269 | 1187 | #endif |
ba14a194 | 1188 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1189 | struct vm_struct *stack_vm_area; |
ba14a194 | 1190 | #endif |
68f24b08 | 1191 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
1192 | /* A live task holds one reference: */ |
1193 | atomic_t stack_refcount; | |
d83a7cb3 JP |
1194 | #endif |
1195 | #ifdef CONFIG_LIVEPATCH | |
1196 | int patch_state; | |
0302e28d | 1197 | #endif |
e4e55b47 TH |
1198 | #ifdef CONFIG_SECURITY |
1199 | /* Used by LSM modules for access restriction: */ | |
1200 | void *security; | |
68f24b08 | 1201 | #endif |
29e48ce8 | 1202 | |
afaef01c AP |
1203 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1204 | unsigned long lowest_stack; | |
c8d12627 | 1205 | unsigned long prev_lowest_stack; |
afaef01c AP |
1206 | #endif |
1207 | ||
29e48ce8 KC |
1208 | /* |
1209 | * New fields for task_struct should be added above here, so that | |
1210 | * they are included in the randomized portion of task_struct. | |
1211 | */ | |
1212 | randomized_struct_fields_end | |
1213 | ||
5eca1c10 IM |
1214 | /* CPU-specific state of this task: */ |
1215 | struct thread_struct thread; | |
1216 | ||
1217 | /* | |
1218 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1219 | * structure. It *MUST* be at the end of 'task_struct'. | |
1220 | * | |
1221 | * Do not put anything below here! | |
1222 | */ | |
1da177e4 LT |
1223 | }; |
1224 | ||
e868171a | 1225 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 | 1226 | { |
2c470475 | 1227 | return task->thread_pid; |
22c935f4 EB |
1228 | } |
1229 | ||
7af57294 PE |
1230 | /* |
1231 | * the helpers to get the task's different pids as they are seen | |
1232 | * from various namespaces | |
1233 | * | |
1234 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1235 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1236 | * current. | |
7af57294 PE |
1237 | * task_xid_nr_ns() : id seen from the ns specified; |
1238 | * | |
7af57294 PE |
1239 | * see also pid_nr() etc in include/linux/pid.h |
1240 | */ | |
5eca1c10 | 1241 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1242 | |
e868171a | 1243 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1244 | { |
1245 | return tsk->pid; | |
1246 | } | |
1247 | ||
5eca1c10 | 1248 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1249 | { |
1250 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1251 | } | |
7af57294 PE |
1252 | |
1253 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1254 | { | |
52ee2dfd | 1255 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1256 | } |
1257 | ||
1258 | ||
e868171a | 1259 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1260 | { |
1261 | return tsk->tgid; | |
1262 | } | |
1263 | ||
5eca1c10 IM |
1264 | /** |
1265 | * pid_alive - check that a task structure is not stale | |
1266 | * @p: Task structure to be checked. | |
1267 | * | |
1268 | * Test if a process is not yet dead (at most zombie state) | |
1269 | * If pid_alive fails, then pointers within the task structure | |
1270 | * can be stale and must not be dereferenced. | |
1271 | * | |
1272 | * Return: 1 if the process is alive. 0 otherwise. | |
1273 | */ | |
1274 | static inline int pid_alive(const struct task_struct *p) | |
1275 | { | |
2c470475 | 1276 | return p->thread_pid != NULL; |
5eca1c10 | 1277 | } |
7af57294 | 1278 | |
5eca1c10 | 1279 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1280 | { |
52ee2dfd | 1281 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1282 | } |
1283 | ||
7af57294 PE |
1284 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1285 | { | |
52ee2dfd | 1286 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1287 | } |
1288 | ||
1289 | ||
5eca1c10 | 1290 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1291 | { |
52ee2dfd | 1292 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1293 | } |
1294 | ||
7af57294 PE |
1295 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1296 | { | |
52ee2dfd | 1297 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1298 | } |
1299 | ||
dd1c1f2f ON |
1300 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1301 | { | |
6883f81a | 1302 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); |
dd1c1f2f ON |
1303 | } |
1304 | ||
1305 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1306 | { | |
6883f81a | 1307 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); |
dd1c1f2f ON |
1308 | } |
1309 | ||
1310 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1311 | { | |
1312 | pid_t pid = 0; | |
1313 | ||
1314 | rcu_read_lock(); | |
1315 | if (pid_alive(tsk)) | |
1316 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1317 | rcu_read_unlock(); | |
1318 | ||
1319 | return pid; | |
1320 | } | |
1321 | ||
1322 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1323 | { | |
1324 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1325 | } | |
1326 | ||
5eca1c10 | 1327 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1328 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1329 | { | |
1330 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1331 | } | |
7af57294 | 1332 | |
06eb6184 PZ |
1333 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1334 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1335 | ||
1d48b080 | 1336 | static inline unsigned int task_state_index(struct task_struct *tsk) |
20435d84 | 1337 | { |
1593baab PZ |
1338 | unsigned int tsk_state = READ_ONCE(tsk->state); |
1339 | unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT; | |
20435d84 | 1340 | |
06eb6184 PZ |
1341 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1342 | ||
06eb6184 PZ |
1343 | if (tsk_state == TASK_IDLE) |
1344 | state = TASK_REPORT_IDLE; | |
1345 | ||
1593baab PZ |
1346 | return fls(state); |
1347 | } | |
1348 | ||
1d48b080 | 1349 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1350 | { |
8ef9925b | 1351 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1352 | |
06eb6184 | 1353 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1354 | |
1593baab PZ |
1355 | return state_char[state]; |
1356 | } | |
1357 | ||
1358 | static inline char task_state_to_char(struct task_struct *tsk) | |
1359 | { | |
1d48b080 | 1360 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1361 | } |
1362 | ||
f400e198 | 1363 | /** |
570f5241 SS |
1364 | * is_global_init - check if a task structure is init. Since init |
1365 | * is free to have sub-threads we need to check tgid. | |
3260259f H |
1366 | * @tsk: Task structure to be checked. |
1367 | * | |
1368 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1369 | * |
1370 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1371 | */ |
e868171a | 1372 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1373 | { |
570f5241 | 1374 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1375 | } |
b460cbc5 | 1376 | |
9ec52099 CLG |
1377 | extern struct pid *cad_pid; |
1378 | ||
1da177e4 LT |
1379 | /* |
1380 | * Per process flags | |
1381 | */ | |
5eca1c10 IM |
1382 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1383 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
1384 | #define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */ | |
1385 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ | |
1386 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ | |
1387 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1388 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1389 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1390 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1391 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1392 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1393 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1394 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
1395 | #define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */ | |
1396 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ | |
1397 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1398 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1399 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1400 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
5eca1c10 IM |
1401 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
1402 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ | |
1403 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
1404 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
eb414681 | 1405 | #define PF_MEMSTALL 0x01000000 /* Stalled due to lack of memory */ |
5eca1c10 IM |
1406 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
1407 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ | |
1408 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ | |
1409 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ | |
1410 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1411 | |
1412 | /* | |
1413 | * Only the _current_ task can read/write to tsk->flags, but other | |
1414 | * tasks can access tsk->flags in readonly mode for example | |
1415 | * with tsk_used_math (like during threaded core dumping). | |
1416 | * There is however an exception to this rule during ptrace | |
1417 | * or during fork: the ptracer task is allowed to write to the | |
1418 | * child->flags of its traced child (same goes for fork, the parent | |
1419 | * can write to the child->flags), because we're guaranteed the | |
1420 | * child is not running and in turn not changing child->flags | |
1421 | * at the same time the parent does it. | |
1422 | */ | |
5eca1c10 IM |
1423 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1424 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1425 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1426 | #define set_used_math() set_stopped_child_used_math(current) | |
1427 | ||
1da177e4 LT |
1428 | #define conditional_stopped_child_used_math(condition, child) \ |
1429 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1430 | |
1431 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1432 | ||
1da177e4 LT |
1433 | #define copy_to_stopped_child_used_math(child) \ |
1434 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1435 | |
1da177e4 | 1436 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1437 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1438 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1439 | |
62ec05dd TG |
1440 | static inline bool is_percpu_thread(void) |
1441 | { | |
1442 | #ifdef CONFIG_SMP | |
1443 | return (current->flags & PF_NO_SETAFFINITY) && | |
1444 | (current->nr_cpus_allowed == 1); | |
1445 | #else | |
1446 | return true; | |
1447 | #endif | |
1448 | } | |
1449 | ||
1d4457f9 | 1450 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1451 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1452 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1453 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1454 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1455 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
1d4457f9 | 1456 | |
e0e5070b ZL |
1457 | #define TASK_PFA_TEST(name, func) \ |
1458 | static inline bool task_##func(struct task_struct *p) \ | |
1459 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1460 | |
e0e5070b ZL |
1461 | #define TASK_PFA_SET(name, func) \ |
1462 | static inline void task_set_##func(struct task_struct *p) \ | |
1463 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1464 | |
e0e5070b ZL |
1465 | #define TASK_PFA_CLEAR(name, func) \ |
1466 | static inline void task_clear_##func(struct task_struct *p) \ | |
1467 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1468 | ||
1469 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1470 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1471 | |
2ad654bc ZL |
1472 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1473 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1474 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1475 | ||
1476 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1477 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1478 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1479 | |
356e4bff TG |
1480 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1481 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1482 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1483 | ||
1484 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1485 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1486 | ||
5eca1c10 | 1487 | static inline void |
717a94b5 | 1488 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1489 | { |
717a94b5 N |
1490 | current->flags &= ~flags; |
1491 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1492 | } |
1493 | ||
5eca1c10 IM |
1494 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
1495 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1496 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1497 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1498 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
1da177e4 | 1499 | #else |
5eca1c10 | 1500 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1501 | { |
1502 | } | |
5eca1c10 | 1503 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1504 | { |
96f874e2 | 1505 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1506 | return -EINVAL; |
1507 | return 0; | |
1508 | } | |
1509 | #endif | |
e0ad9556 | 1510 | |
6d0d2878 CB |
1511 | #ifndef cpu_relax_yield |
1512 | #define cpu_relax_yield() cpu_relax() | |
1513 | #endif | |
1514 | ||
fa93384f | 1515 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1516 | extern void set_user_nice(struct task_struct *p, long nice); |
1517 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1518 | |
d0ea0268 DY |
1519 | /** |
1520 | * task_nice - return the nice value of a given task. | |
1521 | * @p: the task in question. | |
1522 | * | |
1523 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1524 | */ | |
1525 | static inline int task_nice(const struct task_struct *p) | |
1526 | { | |
1527 | return PRIO_TO_NICE((p)->static_prio); | |
1528 | } | |
5eca1c10 | 1529 | |
36c8b586 IM |
1530 | extern int can_nice(const struct task_struct *p, const int nice); |
1531 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1532 | extern int idle_cpu(int cpu); |
943d355d | 1533 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1534 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1535 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
1536 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); | |
794a56eb | 1537 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1538 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1539 | |
c4f30608 PM |
1540 | /** |
1541 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1542 | * @p: the task in question. |
e69f6186 YB |
1543 | * |
1544 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1545 | */ |
7061ca3b | 1546 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1547 | { |
c1de45ca | 1548 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1549 | } |
5eca1c10 | 1550 | |
36c8b586 | 1551 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1552 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1553 | |
1554 | void yield(void); | |
1555 | ||
1da177e4 | 1556 | union thread_union { |
0500871f DH |
1557 | #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK |
1558 | struct task_struct task; | |
1559 | #endif | |
c65eacbe | 1560 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1561 | struct thread_info thread_info; |
c65eacbe | 1562 | #endif |
1da177e4 LT |
1563 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1564 | }; | |
1565 | ||
0500871f DH |
1566 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1567 | extern struct thread_info init_thread_info; | |
1568 | #endif | |
1569 | ||
1570 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1571 | ||
f3ac6067 IM |
1572 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1573 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
1574 | { | |
1575 | return &task->thread_info; | |
1576 | } | |
1577 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
1578 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1579 | #endif | |
1580 | ||
198fe21b PE |
1581 | /* |
1582 | * find a task by one of its numerical ids | |
1583 | * | |
198fe21b PE |
1584 | * find_task_by_pid_ns(): |
1585 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1586 | * find_task_by_vpid(): |
1587 | * finds a task by its virtual pid | |
198fe21b | 1588 | * |
e49859e7 | 1589 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1590 | */ |
1591 | ||
228ebcbe | 1592 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1593 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1594 | |
2ee08260 MR |
1595 | /* |
1596 | * find a task by its virtual pid and get the task struct | |
1597 | */ | |
1598 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1599 | ||
b3c97528 HH |
1600 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1601 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1602 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1603 | |
1da177e4 | 1604 | #ifdef CONFIG_SMP |
5eca1c10 | 1605 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1606 | #else |
5eca1c10 | 1607 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1608 | #endif |
1da177e4 | 1609 | |
82b89778 | 1610 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1611 | |
82b89778 AH |
1612 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1613 | { | |
1614 | __set_task_comm(tsk, from, false); | |
1615 | } | |
5eca1c10 | 1616 | |
3756f640 AB |
1617 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1618 | #define get_task_comm(buf, tsk) ({ \ | |
1619 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1620 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1621 | }) | |
1da177e4 LT |
1622 | |
1623 | #ifdef CONFIG_SMP | |
317f3941 | 1624 | void scheduler_ipi(void); |
85ba2d86 | 1625 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 1626 | #else |
184748cc | 1627 | static inline void scheduler_ipi(void) { } |
5eca1c10 | 1628 | static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state) |
85ba2d86 RM |
1629 | { |
1630 | return 1; | |
1631 | } | |
1da177e4 LT |
1632 | #endif |
1633 | ||
5eca1c10 IM |
1634 | /* |
1635 | * Set thread flags in other task's structures. | |
1636 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1637 | */ |
1638 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1639 | { | |
a1261f54 | 1640 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1644 | { | |
a1261f54 | 1645 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1646 | } |
1647 | ||
93ee37c2 DM |
1648 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
1649 | bool value) | |
1650 | { | |
1651 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
1652 | } | |
1653 | ||
1da177e4 LT |
1654 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
1655 | { | |
a1261f54 | 1656 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1657 | } |
1658 | ||
1659 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1660 | { | |
a1261f54 | 1661 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1662 | } |
1663 | ||
1664 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1665 | { | |
a1261f54 | 1666 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1667 | } |
1668 | ||
1669 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1670 | { | |
1671 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1672 | } | |
1673 | ||
1674 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1675 | { | |
1676 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1677 | } | |
1678 | ||
8ae121ac GH |
1679 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1680 | { | |
1681 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1682 | } | |
1683 | ||
1da177e4 LT |
1684 | /* |
1685 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1686 | * explicit rescheduling in places that are safe. The return | |
1687 | * value indicates whether a reschedule was done in fact. | |
1688 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 1689 | */ |
35a773a0 | 1690 | #ifndef CONFIG_PREEMPT |
c3921ab7 | 1691 | extern int _cond_resched(void); |
35a773a0 PZ |
1692 | #else |
1693 | static inline int _cond_resched(void) { return 0; } | |
1694 | #endif | |
6f80bd98 | 1695 | |
613afbf8 | 1696 | #define cond_resched() ({ \ |
3427445a | 1697 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
1698 | _cond_resched(); \ |
1699 | }) | |
6f80bd98 | 1700 | |
613afbf8 FW |
1701 | extern int __cond_resched_lock(spinlock_t *lock); |
1702 | ||
1703 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 1704 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
1705 | __cond_resched_lock(lock); \ |
1706 | }) | |
1707 | ||
f6f3c437 SH |
1708 | static inline void cond_resched_rcu(void) |
1709 | { | |
1710 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
1711 | rcu_read_unlock(); | |
1712 | cond_resched(); | |
1713 | rcu_read_lock(); | |
1714 | #endif | |
1715 | } | |
1716 | ||
1da177e4 LT |
1717 | /* |
1718 | * Does a critical section need to be broken due to another | |
95c354fe NP |
1719 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
1720 | * but a general need for low latency) | |
1da177e4 | 1721 | */ |
95c354fe | 1722 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1723 | { |
95c354fe NP |
1724 | #ifdef CONFIG_PREEMPT |
1725 | return spin_is_contended(lock); | |
1726 | #else | |
1da177e4 | 1727 | return 0; |
95c354fe | 1728 | #endif |
1da177e4 LT |
1729 | } |
1730 | ||
75f93fed PZ |
1731 | static __always_inline bool need_resched(void) |
1732 | { | |
1733 | return unlikely(tif_need_resched()); | |
1734 | } | |
1735 | ||
1da177e4 LT |
1736 | /* |
1737 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1738 | */ | |
1739 | #ifdef CONFIG_SMP | |
1740 | ||
1741 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1742 | { | |
c65eacbe AL |
1743 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1744 | return p->cpu; | |
1745 | #else | |
a1261f54 | 1746 | return task_thread_info(p)->cpu; |
c65eacbe | 1747 | #endif |
1da177e4 LT |
1748 | } |
1749 | ||
c65cc870 | 1750 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
1751 | |
1752 | #else | |
1753 | ||
1754 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1755 | { | |
1756 | return 0; | |
1757 | } | |
1758 | ||
1759 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1760 | { | |
1761 | } | |
1762 | ||
1763 | #endif /* CONFIG_SMP */ | |
1764 | ||
d9345c65 PX |
1765 | /* |
1766 | * In order to reduce various lock holder preemption latencies provide an | |
1767 | * interface to see if a vCPU is currently running or not. | |
1768 | * | |
1769 | * This allows us to terminate optimistic spin loops and block, analogous to | |
1770 | * the native optimistic spin heuristic of testing if the lock owner task is | |
1771 | * running or not. | |
1772 | */ | |
1773 | #ifndef vcpu_is_preempted | |
1774 | # define vcpu_is_preempted(cpu) false | |
1775 | #endif | |
1776 | ||
96f874e2 RR |
1777 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
1778 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 1779 | |
82455257 DH |
1780 | #ifndef TASK_SIZE_OF |
1781 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
1782 | #endif | |
1783 | ||
d7822b1e MD |
1784 | #ifdef CONFIG_RSEQ |
1785 | ||
1786 | /* | |
1787 | * Map the event mask on the user-space ABI enum rseq_cs_flags | |
1788 | * for direct mask checks. | |
1789 | */ | |
1790 | enum rseq_event_mask_bits { | |
1791 | RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, | |
1792 | RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, | |
1793 | RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, | |
1794 | }; | |
1795 | ||
1796 | enum rseq_event_mask { | |
1797 | RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), | |
1798 | RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), | |
1799 | RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), | |
1800 | }; | |
1801 | ||
1802 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
1803 | { | |
1804 | if (t->rseq) | |
1805 | set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); | |
1806 | } | |
1807 | ||
784e0300 | 1808 | void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); |
d7822b1e | 1809 | |
784e0300 WD |
1810 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
1811 | struct pt_regs *regs) | |
d7822b1e MD |
1812 | { |
1813 | if (current->rseq) | |
784e0300 | 1814 | __rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
1815 | } |
1816 | ||
784e0300 WD |
1817 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
1818 | struct pt_regs *regs) | |
d7822b1e MD |
1819 | { |
1820 | preempt_disable(); | |
1821 | __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); | |
1822 | preempt_enable(); | |
784e0300 | 1823 | rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
1824 | } |
1825 | ||
1826 | /* rseq_preempt() requires preemption to be disabled. */ | |
1827 | static inline void rseq_preempt(struct task_struct *t) | |
1828 | { | |
1829 | __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); | |
1830 | rseq_set_notify_resume(t); | |
1831 | } | |
1832 | ||
1833 | /* rseq_migrate() requires preemption to be disabled. */ | |
1834 | static inline void rseq_migrate(struct task_struct *t) | |
1835 | { | |
1836 | __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); | |
1837 | rseq_set_notify_resume(t); | |
1838 | } | |
1839 | ||
1840 | /* | |
1841 | * If parent process has a registered restartable sequences area, the | |
9a789fcf | 1842 | * child inherits. Only applies when forking a process, not a thread. |
d7822b1e MD |
1843 | */ |
1844 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
1845 | { | |
1846 | if (clone_flags & CLONE_THREAD) { | |
1847 | t->rseq = NULL; | |
1848 | t->rseq_len = 0; | |
1849 | t->rseq_sig = 0; | |
1850 | t->rseq_event_mask = 0; | |
1851 | } else { | |
1852 | t->rseq = current->rseq; | |
1853 | t->rseq_len = current->rseq_len; | |
1854 | t->rseq_sig = current->rseq_sig; | |
1855 | t->rseq_event_mask = current->rseq_event_mask; | |
d7822b1e MD |
1856 | } |
1857 | } | |
1858 | ||
1859 | static inline void rseq_execve(struct task_struct *t) | |
1860 | { | |
1861 | t->rseq = NULL; | |
1862 | t->rseq_len = 0; | |
1863 | t->rseq_sig = 0; | |
1864 | t->rseq_event_mask = 0; | |
1865 | } | |
1866 | ||
1867 | #else | |
1868 | ||
1869 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
1870 | { | |
1871 | } | |
784e0300 WD |
1872 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
1873 | struct pt_regs *regs) | |
d7822b1e MD |
1874 | { |
1875 | } | |
784e0300 WD |
1876 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
1877 | struct pt_regs *regs) | |
d7822b1e MD |
1878 | { |
1879 | } | |
1880 | static inline void rseq_preempt(struct task_struct *t) | |
1881 | { | |
1882 | } | |
1883 | static inline void rseq_migrate(struct task_struct *t) | |
1884 | { | |
1885 | } | |
1886 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
1887 | { | |
1888 | } | |
1889 | static inline void rseq_execve(struct task_struct *t) | |
1890 | { | |
1891 | } | |
1892 | ||
1893 | #endif | |
1894 | ||
1895 | #ifdef CONFIG_DEBUG_RSEQ | |
1896 | ||
1897 | void rseq_syscall(struct pt_regs *regs); | |
1898 | ||
1899 | #else | |
1900 | ||
1901 | static inline void rseq_syscall(struct pt_regs *regs) | |
1902 | { | |
1903 | } | |
1904 | ||
1905 | #endif | |
1906 | ||
1da177e4 | 1907 | #endif |