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33
34#include <linux/cpu.h>
35#include <linux/export.h>
36#include <linux/percpu.h>
37#include <linux/hrtimer.h>
38#include <linux/notifier.h>
39#include <linux/syscalls.h>
40#include <linux/kallsyms.h>
41#include <linux/interrupt.h>
42#include <linux/tick.h>
43#include <linux/seq_file.h>
44#include <linux/err.h>
45#include <linux/debugobjects.h>
46#include <linux/sched.h>
47#include <linux/sched/sysctl.h>
48#include <linux/sched/rt.h>
49#include <linux/timer.h>
50
51#include <asm/uaccess.h>
52
53#include <trace/events/timer.h>
54
55
56
57
58
59
60
61
62
63DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
64{
65
66 .lock = __RAW_SPIN_LOCK_UNLOCKED(hrtimer_bases.lock),
67 .clock_base =
68 {
69 {
70 .index = HRTIMER_BASE_MONOTONIC,
71 .clockid = CLOCK_MONOTONIC,
72 .get_time = &ktime_get,
73 .resolution = KTIME_LOW_RES,
74 },
75 {
76 .index = HRTIMER_BASE_REALTIME,
77 .clockid = CLOCK_REALTIME,
78 .get_time = &ktime_get_real,
79 .resolution = KTIME_LOW_RES,
80 },
81 {
82 .index = HRTIMER_BASE_BOOTTIME,
83 .clockid = CLOCK_BOOTTIME,
84 .get_time = &ktime_get_boottime,
85 .resolution = KTIME_LOW_RES,
86 },
87 {
88 .index = HRTIMER_BASE_TAI,
89 .clockid = CLOCK_TAI,
90 .get_time = &ktime_get_clocktai,
91 .resolution = KTIME_LOW_RES,
92 },
93 }
94};
95
96static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = {
97 [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME,
98 [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC,
99 [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME,
100 [CLOCK_TAI] = HRTIMER_BASE_TAI,
101};
102
103static inline int hrtimer_clockid_to_base(clockid_t clock_id)
104{
105 return hrtimer_clock_to_base_table[clock_id];
106}
107
108
109
110
111
112
113static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
114{
115 ktime_t xtim, mono, boot;
116 struct timespec xts, tom, slp;
117 s32 tai_offset;
118
119 get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp);
120 tai_offset = timekeeping_get_tai_offset();
121
122 xtim = timespec_to_ktime(xts);
123 mono = ktime_add(xtim, timespec_to_ktime(tom));
124 boot = ktime_add(mono, timespec_to_ktime(slp));
125 base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
126 base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;
127 base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot;
128 base->clock_base[HRTIMER_BASE_TAI].softirq_time =
129 ktime_add(xtim, ktime_set(tai_offset, 0));
130}
131
132
133
134
135
136#ifdef CONFIG_SMP
137
138
139
140
141
142
143
144
145
146
147
148
149
150static
151struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
152 unsigned long *flags)
153{
154 struct hrtimer_clock_base *base;
155
156 for (;;) {
157 base = timer->base;
158 if (likely(base != NULL)) {
159 raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
160 if (likely(base == timer->base))
161 return base;
162
163 raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
164 }
165 cpu_relax();
166 }
167}
168
169
170
171
172
173static int hrtimer_get_target(int this_cpu, int pinned)
174{
175#ifdef CONFIG_NO_HZ_COMMON
176 if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu))
177 return get_nohz_timer_target();
178#endif
179 return this_cpu;
180}
181
182
183
184
185
186
187
188
189static int
190hrtimer_check_target(struct hrtimer *timer, struct hrtimer_clock_base *new_base)
191{
192#ifdef CONFIG_HIGH_RES_TIMERS
193 ktime_t expires;
194
195 if (!new_base->cpu_base->hres_active)
196 return 0;
197
198 expires = ktime_sub(hrtimer_get_expires(timer), new_base->offset);
199 return expires.tv64 <= new_base->cpu_base->expires_next.tv64;
200#else
201 return 0;
202#endif
203}
204
205
206
207
208static inline struct hrtimer_clock_base *
209switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
210 int pinned)
211{
212 struct hrtimer_clock_base *new_base;
213 struct hrtimer_cpu_base *new_cpu_base;
214 int this_cpu = smp_processor_id();
215 int cpu = hrtimer_get_target(this_cpu, pinned);
216 int basenum = base->index;
217
218again:
219 new_cpu_base = &per_cpu(hrtimer_bases, cpu);
220 new_base = &new_cpu_base->clock_base[basenum];
221
222 if (base != new_base) {
223
224
225
226
227
228
229
230
231
232 if (unlikely(hrtimer_callback_running(timer)))
233 return base;
234
235
236 timer->base = NULL;
237 raw_spin_unlock(&base->cpu_base->lock);
238 raw_spin_lock(&new_base->cpu_base->lock);
239
240 if (cpu != this_cpu && hrtimer_check_target(timer, new_base)) {
241 cpu = this_cpu;
242 raw_spin_unlock(&new_base->cpu_base->lock);
243 raw_spin_lock(&base->cpu_base->lock);
244 timer->base = base;
245 goto again;
246 }
247 timer->base = new_base;
248 }
249 return new_base;
250}
251
252#else
253
254static inline struct hrtimer_clock_base *
255lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
256{
257 struct hrtimer_clock_base *base = timer->base;
258
259 raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
260
261 return base;
262}
263
264# define switch_hrtimer_base(t, b, p) (b)
265
266#endif
267
268
269
270
271
272#if BITS_PER_LONG < 64
273# ifndef CONFIG_KTIME_SCALAR
274
275
276
277
278
279
280
281ktime_t ktime_add_ns(const ktime_t kt, u64 nsec)
282{
283 ktime_t tmp;
284
285 if (likely(nsec < NSEC_PER_SEC)) {
286 tmp.tv64 = nsec;
287 } else {
288 unsigned long rem = do_div(nsec, NSEC_PER_SEC);
289
290
291 if (unlikely(nsec > KTIME_SEC_MAX))
292 return (ktime_t){ .tv64 = KTIME_MAX };
293
294 tmp = ktime_set((long)nsec, rem);
295 }
296
297 return ktime_add(kt, tmp);
298}
299
300EXPORT_SYMBOL_GPL(ktime_add_ns);
301
302
303
304
305
306
307
308
309ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec)
310{
311 ktime_t tmp;
312
313 if (likely(nsec < NSEC_PER_SEC)) {
314 tmp.tv64 = nsec;
315 } else {
316 unsigned long rem = do_div(nsec, NSEC_PER_SEC);
317
318 tmp = ktime_set((long)nsec, rem);
319 }
320
321 return ktime_sub(kt, tmp);
322}
323
324EXPORT_SYMBOL_GPL(ktime_sub_ns);
325# endif
326
327
328
329
330u64 ktime_divns(const ktime_t kt, s64 div)
331{
332 u64 dclc;
333 int sft = 0;
334
335 dclc = ktime_to_ns(kt);
336
337 while (div >> 32) {
338 sft++;
339 div >>= 1;
340 }
341 dclc >>= sft;
342 do_div(dclc, (unsigned long) div);
343
344 return dclc;
345}
346#endif
347
348
349
350
351ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs)
352{
353 ktime_t res = ktime_add(lhs, rhs);
354
355
356
357
358
359 if (res.tv64 < 0 || res.tv64 < lhs.tv64 || res.tv64 < rhs.tv64)
360 res = ktime_set(KTIME_SEC_MAX, 0);
361
362 return res;
363}
364
365EXPORT_SYMBOL_GPL(ktime_add_safe);
366
367#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
368
369static struct debug_obj_descr hrtimer_debug_descr;
370
371static void *hrtimer_debug_hint(void *addr)
372{
373 return ((struct hrtimer *) addr)->function;
374}
375
376
377
378
379
380static int hrtimer_fixup_init(void *addr, enum debug_obj_state state)
381{
382 struct hrtimer *timer = addr;
383
384 switch (state) {
385 case ODEBUG_STATE_ACTIVE:
386 hrtimer_cancel(timer);
387 debug_object_init(timer, &hrtimer_debug_descr);
388 return 1;
389 default:
390 return 0;
391 }
392}
393
394
395
396
397
398
399static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
400{
401 switch (state) {
402
403 case ODEBUG_STATE_NOTAVAILABLE:
404 WARN_ON_ONCE(1);
405 return 0;
406
407 case ODEBUG_STATE_ACTIVE:
408 WARN_ON(1);
409
410 default:
411 return 0;
412 }
413}
414
415
416
417
418
419static int hrtimer_fixup_free(void *addr, enum debug_obj_state state)
420{
421 struct hrtimer *timer = addr;
422
423 switch (state) {
424 case ODEBUG_STATE_ACTIVE:
425 hrtimer_cancel(timer);
426 debug_object_free(timer, &hrtimer_debug_descr);
427 return 1;
428 default:
429 return 0;
430 }
431}
432
433static struct debug_obj_descr hrtimer_debug_descr = {
434 .name = "hrtimer",
435 .debug_hint = hrtimer_debug_hint,
436 .fixup_init = hrtimer_fixup_init,
437 .fixup_activate = hrtimer_fixup_activate,
438 .fixup_free = hrtimer_fixup_free,
439};
440
441static inline void debug_hrtimer_init(struct hrtimer *timer)
442{
443 debug_object_init(timer, &hrtimer_debug_descr);
444}
445
446static inline void debug_hrtimer_activate(struct hrtimer *timer)
447{
448 debug_object_activate(timer, &hrtimer_debug_descr);
449}
450
451static inline void debug_hrtimer_deactivate(struct hrtimer *timer)
452{
453 debug_object_deactivate(timer, &hrtimer_debug_descr);
454}
455
456static inline void debug_hrtimer_free(struct hrtimer *timer)
457{
458 debug_object_free(timer, &hrtimer_debug_descr);
459}
460
461static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
462 enum hrtimer_mode mode);
463
464void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id,
465 enum hrtimer_mode mode)
466{
467 debug_object_init_on_stack(timer, &hrtimer_debug_descr);
468 __hrtimer_init(timer, clock_id, mode);
469}
470EXPORT_SYMBOL_GPL(hrtimer_init_on_stack);
471
472void destroy_hrtimer_on_stack(struct hrtimer *timer)
473{
474 debug_object_free(timer, &hrtimer_debug_descr);
475}
476
477#else
478static inline void debug_hrtimer_init(struct hrtimer *timer) { }
479static inline void debug_hrtimer_activate(struct hrtimer *timer) { }
480static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { }
481#endif
482
483static inline void
484debug_init(struct hrtimer *timer, clockid_t clockid,
485 enum hrtimer_mode mode)
486{
487 debug_hrtimer_init(timer);
488 trace_hrtimer_init(timer, clockid, mode);
489}
490
491static inline void debug_activate(struct hrtimer *timer)
492{
493 debug_hrtimer_activate(timer);
494 trace_hrtimer_start(timer);
495}
496
497static inline void debug_deactivate(struct hrtimer *timer)
498{
499 debug_hrtimer_deactivate(timer);
500 trace_hrtimer_cancel(timer);
501}
502
503
504#ifdef CONFIG_HIGH_RES_TIMERS
505
506
507
508
509static int hrtimer_hres_enabled __read_mostly = 1;
510
511
512
513
514static int __init setup_hrtimer_hres(char *str)
515{
516 if (!strcmp(str, "off"))
517 hrtimer_hres_enabled = 0;
518 else if (!strcmp(str, "on"))
519 hrtimer_hres_enabled = 1;
520 else
521 return 0;
522 return 1;
523}
524
525__setup("highres=", setup_hrtimer_hres);
526
527
528
529
530static inline int hrtimer_is_hres_enabled(void)
531{
532 return hrtimer_hres_enabled;
533}
534
535
536
537
538static inline int hrtimer_hres_active(void)
539{
540 return __this_cpu_read(hrtimer_bases.hres_active);
541}
542
543
544
545
546
547
548static void
549hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal)
550{
551 int i;
552 struct hrtimer_clock_base *base = cpu_base->clock_base;
553 ktime_t expires, expires_next;
554
555 expires_next.tv64 = KTIME_MAX;
556
557 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) {
558 struct hrtimer *timer;
559 struct timerqueue_node *next;
560
561 next = timerqueue_getnext(&base->active);
562 if (!next)
563 continue;
564 timer = container_of(next, struct hrtimer, node);
565
566 expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
567
568
569
570
571
572 if (expires.tv64 < 0)
573 expires.tv64 = 0;
574 if (expires.tv64 < expires_next.tv64)
575 expires_next = expires;
576 }
577
578 if (skip_equal && expires_next.tv64 == cpu_base->expires_next.tv64)
579 return;
580
581 cpu_base->expires_next.tv64 = expires_next.tv64;
582
583 if (cpu_base->expires_next.tv64 != KTIME_MAX)
584 tick_program_event(cpu_base->expires_next, 1);
585}
586
587
588
589
590
591
592
593
594
595
596static int hrtimer_reprogram(struct hrtimer *timer,
597 struct hrtimer_clock_base *base)
598{
599 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
600 ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
601 int res;
602
603 WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0);
604
605
606
607
608
609
610
611
612 if (hrtimer_callback_running(timer))
613 return 0;
614
615
616
617
618
619
620
621 if (expires.tv64 < 0)
622 return -ETIME;
623
624 if (expires.tv64 >= cpu_base->expires_next.tv64)
625 return 0;
626
627
628
629
630
631
632
633 if (cpu_base->hang_detected)
634 return 0;
635
636
637
638
639 res = tick_program_event(expires, 0);
640 if (!IS_ERR_VALUE(res))
641 cpu_base->expires_next = expires;
642 return res;
643}
644
645
646
647
648static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base)
649{
650 base->expires_next.tv64 = KTIME_MAX;
651 base->hres_active = 0;
652}
653
654
655
656
657
658
659
660static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
661 struct hrtimer_clock_base *base)
662{
663 return base->cpu_base->hres_active && hrtimer_reprogram(timer, base);
664}
665
666static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base)
667{
668 ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset;
669 ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset;
670 ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset;
671
672 return ktime_get_update_offsets(offs_real, offs_boot, offs_tai);
673}
674
675
676
677
678
679
680static void retrigger_next_event(void *arg)
681{
682 struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
683
684 if (!hrtimer_hres_active())
685 return;
686
687 raw_spin_lock(&base->lock);
688 hrtimer_update_base(base);
689 hrtimer_force_reprogram(base, 0);
690 raw_spin_unlock(&base->lock);
691}
692
693
694
695
696static int hrtimer_switch_to_hres(void)
697{
698 int i, cpu = smp_processor_id();
699 struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu);
700 unsigned long flags;
701
702 if (base->hres_active)
703 return 1;
704
705 local_irq_save(flags);
706
707 if (tick_init_highres()) {
708 local_irq_restore(flags);
709 printk(KERN_WARNING "Could not switch to high resolution "
710 "mode on CPU %d\n", cpu);
711 return 0;
712 }
713 base->hres_active = 1;
714 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
715 base->clock_base[i].resolution = KTIME_HIGH_RES;
716
717 tick_setup_sched_timer();
718
719 retrigger_next_event(NULL);
720 local_irq_restore(flags);
721 return 1;
722}
723
724
725
726
727
728
729void clock_was_set_delayed(void)
730{
731 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
732
733 cpu_base->clock_was_set = 1;
734 __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
735}
736
737#else
738
739static inline int hrtimer_hres_active(void) { return 0; }
740static inline int hrtimer_is_hres_enabled(void) { return 0; }
741static inline int hrtimer_switch_to_hres(void) { return 0; }
742static inline void
743hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { }
744static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
745 struct hrtimer_clock_base *base)
746{
747 return 0;
748}
749static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
750static inline void retrigger_next_event(void *arg) { }
751
752#endif
753
754
755
756
757
758
759
760
761
762
763
764
765void clock_was_set(void)
766{
767#ifdef CONFIG_HIGH_RES_TIMERS
768
769 on_each_cpu(retrigger_next_event, NULL, 1);
770#endif
771 timerfd_clock_was_set();
772}
773
774
775
776
777
778void hrtimers_resume(void)
779{
780 WARN_ONCE(!irqs_disabled(),
781 KERN_INFO "hrtimers_resume() called with IRQs enabled!");
782
783 retrigger_next_event(NULL);
784 timerfd_clock_was_set();
785}
786
787static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
788{
789#ifdef CONFIG_TIMER_STATS
790 if (timer->start_site)
791 return;
792 timer->start_site = __builtin_return_address(0);
793 memcpy(timer->start_comm, current->comm, TASK_COMM_LEN);
794 timer->start_pid = current->pid;
795#endif
796}
797
798static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer)
799{
800#ifdef CONFIG_TIMER_STATS
801 timer->start_site = NULL;
802#endif
803}
804
805static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
806{
807#ifdef CONFIG_TIMER_STATS
808 if (likely(!timer_stats_active))
809 return;
810 timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
811 timer->function, timer->start_comm, 0);
812#endif
813}
814
815
816
817
818static inline
819void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
820{
821 raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
822}
823
824
825
826
827
828
829
830
831
832
833u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
834{
835 u64 orun = 1;
836 ktime_t delta;
837
838 delta = ktime_sub(now, hrtimer_get_expires(timer));
839
840 if (delta.tv64 < 0)
841 return 0;
842
843 if (interval.tv64 < timer->base->resolution.tv64)
844 interval.tv64 = timer->base->resolution.tv64;
845
846 if (unlikely(delta.tv64 >= interval.tv64)) {
847 s64 incr = ktime_to_ns(interval);
848
849 orun = ktime_divns(delta, incr);
850 hrtimer_add_expires_ns(timer, incr * orun);
851 if (hrtimer_get_expires_tv64(timer) > now.tv64)
852 return orun;
853
854
855
856
857 orun++;
858 }
859 hrtimer_add_expires(timer, interval);
860
861 return orun;
862}
863EXPORT_SYMBOL_GPL(hrtimer_forward);
864
865
866
867
868
869
870
871
872
873static int enqueue_hrtimer(struct hrtimer *timer,
874 struct hrtimer_clock_base *base)
875{
876 debug_activate(timer);
877
878 timerqueue_add(&base->active, &timer->node);
879 base->cpu_base->active_bases |= 1 << base->index;
880
881
882
883
884
885 timer->state |= HRTIMER_STATE_ENQUEUED;
886
887 return (&timer->node == base->active.next);
888}
889
890
891
892
893
894
895
896
897
898
899
900static void __remove_hrtimer(struct hrtimer *timer,
901 struct hrtimer_clock_base *base,
902 unsigned long newstate, int reprogram)
903{
904 struct timerqueue_node *next_timer;
905 if (!(timer->state & HRTIMER_STATE_ENQUEUED))
906 goto out;
907
908 next_timer = timerqueue_getnext(&base->active);
909 timerqueue_del(&base->active, &timer->node);
910 if (&timer->node == next_timer) {
911#ifdef CONFIG_HIGH_RES_TIMERS
912
913 if (reprogram && hrtimer_hres_active()) {
914 ktime_t expires;
915
916 expires = ktime_sub(hrtimer_get_expires(timer),
917 base->offset);
918 if (base->cpu_base->expires_next.tv64 == expires.tv64)
919 hrtimer_force_reprogram(base->cpu_base, 1);
920 }
921#endif
922 }
923 if (!timerqueue_getnext(&base->active))
924 base->cpu_base->active_bases &= ~(1 << base->index);
925out:
926 timer->state = newstate;
927}
928
929
930
931
932static inline int
933remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
934{
935 if (hrtimer_is_queued(timer)) {
936 unsigned long state;
937 int reprogram;
938
939
940
941
942
943
944
945
946
947 debug_deactivate(timer);
948 timer_stats_hrtimer_clear_start_info(timer);
949 reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases);
950
951
952
953
954
955 state = timer->state & HRTIMER_STATE_CALLBACK;
956 __remove_hrtimer(timer, base, state, reprogram);
957 return 1;
958 }
959 return 0;
960}
961
962int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
963 unsigned long delta_ns, const enum hrtimer_mode mode,
964 int wakeup)
965{
966 struct hrtimer_clock_base *base, *new_base;
967 unsigned long flags;
968 int ret, leftmost;
969
970 base = lock_hrtimer_base(timer, &flags);
971
972
973 ret = remove_hrtimer(timer, base);
974
975
976 new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
977
978 if (mode & HRTIMER_MODE_REL) {
979 tim = ktime_add_safe(tim, new_base->get_time());
980
981
982
983
984
985
986
987#ifdef CONFIG_TIME_LOW_RES
988 tim = ktime_add_safe(tim, base->resolution);
989#endif
990 }
991
992 hrtimer_set_expires_range_ns(timer, tim, delta_ns);
993
994 timer_stats_hrtimer_set_start_info(timer);
995
996 leftmost = enqueue_hrtimer(timer, new_base);
997
998
999
1000
1001
1002
1003
1004 if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)
1005 && hrtimer_enqueue_reprogram(timer, new_base)) {
1006 if (wakeup) {
1007
1008
1009
1010
1011 raw_spin_unlock(&new_base->cpu_base->lock);
1012 raise_softirq_irqoff(HRTIMER_SOFTIRQ);
1013 local_irq_restore(flags);
1014 return ret;
1015 } else {
1016 __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
1017 }
1018 }
1019
1020 unlock_hrtimer_base(timer, &flags);
1021
1022 return ret;
1023}
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
1038 unsigned long delta_ns, const enum hrtimer_mode mode)
1039{
1040 return __hrtimer_start_range_ns(timer, tim, delta_ns, mode, 1);
1041}
1042EXPORT_SYMBOL_GPL(hrtimer_start_range_ns);
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055int
1056hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
1057{
1058 return __hrtimer_start_range_ns(timer, tim, 0, mode, 1);
1059}
1060EXPORT_SYMBOL_GPL(hrtimer_start);
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073int hrtimer_try_to_cancel(struct hrtimer *timer)
1074{
1075 struct hrtimer_clock_base *base;
1076 unsigned long flags;
1077 int ret = -1;
1078
1079 base = lock_hrtimer_base(timer, &flags);
1080
1081 if (!hrtimer_callback_running(timer))
1082 ret = remove_hrtimer(timer, base);
1083
1084 unlock_hrtimer_base(timer, &flags);
1085
1086 return ret;
1087
1088}
1089EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel);
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099int hrtimer_cancel(struct hrtimer *timer)
1100{
1101 for (;;) {
1102 int ret = hrtimer_try_to_cancel(timer);
1103
1104 if (ret >= 0)
1105 return ret;
1106 cpu_relax();
1107 }
1108}
1109EXPORT_SYMBOL_GPL(hrtimer_cancel);
1110
1111
1112
1113
1114
1115ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
1116{
1117 unsigned long flags;
1118 ktime_t rem;
1119
1120 lock_hrtimer_base(timer, &flags);
1121 rem = hrtimer_expires_remaining(timer);
1122 unlock_hrtimer_base(timer, &flags);
1123
1124 return rem;
1125}
1126EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
1127
1128#ifdef CONFIG_NO_HZ_COMMON
1129
1130
1131
1132
1133
1134
1135ktime_t hrtimer_get_next_event(void)
1136{
1137 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
1138 struct hrtimer_clock_base *base = cpu_base->clock_base;
1139 ktime_t delta, mindelta = { .tv64 = KTIME_MAX };
1140 unsigned long flags;
1141 int i;
1142
1143 raw_spin_lock_irqsave(&cpu_base->lock, flags);
1144
1145 if (!hrtimer_hres_active()) {
1146 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) {
1147 struct hrtimer *timer;
1148 struct timerqueue_node *next;
1149
1150 next = timerqueue_getnext(&base->active);
1151 if (!next)
1152 continue;
1153
1154 timer = container_of(next, struct hrtimer, node);
1155 delta.tv64 = hrtimer_get_expires_tv64(timer);
1156 delta = ktime_sub(delta, base->get_time());
1157 if (delta.tv64 < mindelta.tv64)
1158 mindelta.tv64 = delta.tv64;
1159 }
1160 }
1161
1162 raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
1163
1164 if (mindelta.tv64 < 0)
1165 mindelta.tv64 = 0;
1166 return mindelta;
1167}
1168#endif
1169
1170static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
1171 enum hrtimer_mode mode)
1172{
1173 struct hrtimer_cpu_base *cpu_base;
1174 int base;
1175
1176 memset(timer, 0, sizeof(struct hrtimer));
1177
1178 cpu_base = &__raw_get_cpu_var(hrtimer_bases);
1179
1180 if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
1181 clock_id = CLOCK_MONOTONIC;
1182
1183 base = hrtimer_clockid_to_base(clock_id);
1184 timer->base = &cpu_base->clock_base[base];
1185 timerqueue_init(&timer->node);
1186
1187#ifdef CONFIG_TIMER_STATS
1188 timer->start_site = NULL;
1189 timer->start_pid = -1;
1190 memset(timer->start_comm, 0, TASK_COMM_LEN);
1191#endif
1192}
1193
1194
1195
1196
1197
1198
1199
1200void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
1201 enum hrtimer_mode mode)
1202{
1203 debug_init(timer, clock_id, mode);
1204 __hrtimer_init(timer, clock_id, mode);
1205}
1206EXPORT_SYMBOL_GPL(hrtimer_init);
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
1217{
1218 struct hrtimer_cpu_base *cpu_base;
1219 int base = hrtimer_clockid_to_base(which_clock);
1220
1221 cpu_base = &__raw_get_cpu_var(hrtimer_bases);
1222 *tp = ktime_to_timespec(cpu_base->clock_base[base].resolution);
1223
1224 return 0;
1225}
1226EXPORT_SYMBOL_GPL(hrtimer_get_res);
1227
1228static void __run_hrtimer(struct hrtimer *timer, ktime_t *now)
1229{
1230 struct hrtimer_clock_base *base = timer->base;
1231 struct hrtimer_cpu_base *cpu_base = base->cpu_base;
1232 enum hrtimer_restart (*fn)(struct hrtimer *);
1233 int restart;
1234
1235 WARN_ON(!irqs_disabled());
1236
1237 debug_deactivate(timer);
1238 __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0);
1239 timer_stats_account_hrtimer(timer);
1240 fn = timer->function;
1241
1242
1243
1244
1245
1246
1247 raw_spin_unlock(&cpu_base->lock);
1248 trace_hrtimer_expire_entry(timer, now);
1249 restart = fn(timer);
1250 trace_hrtimer_expire_exit(timer);
1251 raw_spin_lock(&cpu_base->lock);
1252
1253
1254
1255
1256
1257
1258 if (restart != HRTIMER_NORESTART) {
1259 BUG_ON(timer->state != HRTIMER_STATE_CALLBACK);
1260 enqueue_hrtimer(timer, base);
1261 }
1262
1263 WARN_ON_ONCE(!(timer->state & HRTIMER_STATE_CALLBACK));
1264
1265 timer->state &= ~HRTIMER_STATE_CALLBACK;
1266}
1267
1268#ifdef CONFIG_HIGH_RES_TIMERS
1269
1270
1271
1272
1273
1274void hrtimer_interrupt(struct clock_event_device *dev)
1275{
1276 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
1277 ktime_t expires_next, now, entry_time, delta;
1278 int i, retries = 0;
1279
1280 BUG_ON(!cpu_base->hres_active);
1281 cpu_base->nr_events++;
1282 dev->next_event.tv64 = KTIME_MAX;
1283
1284 raw_spin_lock(&cpu_base->lock);
1285 entry_time = now = hrtimer_update_base(cpu_base);
1286retry:
1287 expires_next.tv64 = KTIME_MAX;
1288
1289
1290
1291
1292
1293
1294
1295 cpu_base->expires_next.tv64 = KTIME_MAX;
1296
1297 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
1298 struct hrtimer_clock_base *base;
1299 struct timerqueue_node *node;
1300 ktime_t basenow;
1301
1302 if (!(cpu_base->active_bases & (1 << i)))
1303 continue;
1304
1305 base = cpu_base->clock_base + i;
1306 basenow = ktime_add(now, base->offset);
1307
1308 while ((node = timerqueue_getnext(&base->active))) {
1309 struct hrtimer *timer;
1310
1311 timer = container_of(node, struct hrtimer, node);
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326 if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) {
1327 ktime_t expires;
1328
1329 expires = ktime_sub(hrtimer_get_expires(timer),
1330 base->offset);
1331 if (expires.tv64 < 0)
1332 expires.tv64 = KTIME_MAX;
1333 if (expires.tv64 < expires_next.tv64)
1334 expires_next = expires;
1335 break;
1336 }
1337
1338 __run_hrtimer(timer, &basenow);
1339 }
1340 }
1341
1342
1343
1344
1345
1346 cpu_base->expires_next = expires_next;
1347 raw_spin_unlock(&cpu_base->lock);
1348
1349
1350 if (expires_next.tv64 == KTIME_MAX ||
1351 !tick_program_event(expires_next, 0)) {
1352 cpu_base->hang_detected = 0;
1353 return;
1354 }
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369 raw_spin_lock(&cpu_base->lock);
1370 now = hrtimer_update_base(cpu_base);
1371 cpu_base->nr_retries++;
1372 if (++retries < 3)
1373 goto retry;
1374
1375
1376
1377
1378
1379
1380 cpu_base->nr_hangs++;
1381 cpu_base->hang_detected = 1;
1382 raw_spin_unlock(&cpu_base->lock);
1383 delta = ktime_sub(now, entry_time);
1384 if (delta.tv64 > cpu_base->max_hang_time.tv64)
1385 cpu_base->max_hang_time = delta;
1386
1387
1388
1389
1390 if (delta.tv64 > 100 * NSEC_PER_MSEC)
1391 expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC);
1392 else
1393 expires_next = ktime_add(now, delta);
1394 tick_program_event(expires_next, 1);
1395 printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n",
1396 ktime_to_ns(delta));
1397}
1398
1399
1400
1401
1402
1403static void __hrtimer_peek_ahead_timers(void)
1404{
1405 struct tick_device *td;
1406
1407 if (!hrtimer_hres_active())
1408 return;
1409
1410 td = &__get_cpu_var(tick_cpu_device);
1411 if (td && td->evtdev)
1412 hrtimer_interrupt(td->evtdev);
1413}
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424void hrtimer_peek_ahead_timers(void)
1425{
1426 unsigned long flags;
1427
1428 local_irq_save(flags);
1429 __hrtimer_peek_ahead_timers();
1430 local_irq_restore(flags);
1431}
1432
1433static void run_hrtimer_softirq(struct softirq_action *h)
1434{
1435 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
1436
1437 if (cpu_base->clock_was_set) {
1438 cpu_base->clock_was_set = 0;
1439 clock_was_set();
1440 }
1441
1442 hrtimer_peek_ahead_timers();
1443}
1444
1445#else
1446
1447static inline void __hrtimer_peek_ahead_timers(void) { }
1448
1449#endif
1450
1451
1452
1453
1454
1455
1456
1457
1458void hrtimer_run_pending(void)
1459{
1460 if (hrtimer_hres_active())
1461 return;
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471 if (tick_check_oneshot_change(!hrtimer_is_hres_enabled()))
1472 hrtimer_switch_to_hres();
1473}
1474
1475
1476
1477
1478void hrtimer_run_queues(void)
1479{
1480 struct timerqueue_node *node;
1481 struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
1482 struct hrtimer_clock_base *base;
1483 int index, gettime = 1;
1484
1485 if (hrtimer_hres_active())
1486 return;
1487
1488 for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
1489 base = &cpu_base->clock_base[index];
1490 if (!timerqueue_getnext(&base->active))
1491 continue;
1492
1493 if (gettime) {
1494 hrtimer_get_softirq_time(cpu_base);
1495 gettime = 0;
1496 }
1497
1498 raw_spin_lock(&cpu_base->lock);
1499
1500 while ((node = timerqueue_getnext(&base->active))) {
1501 struct hrtimer *timer;
1502
1503 timer = container_of(node, struct hrtimer, node);
1504 if (base->softirq_time.tv64 <=
1505 hrtimer_get_expires_tv64(timer))
1506 break;
1507
1508 __run_hrtimer(timer, &base->softirq_time);
1509 }
1510 raw_spin_unlock(&cpu_base->lock);
1511 }
1512}
1513
1514
1515
1516
1517static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
1518{
1519 struct hrtimer_sleeper *t =
1520 container_of(timer, struct hrtimer_sleeper, timer);
1521 struct task_struct *task = t->task;
1522
1523 t->task = NULL;
1524 if (task)
1525 wake_up_process(task);
1526
1527 return HRTIMER_NORESTART;
1528}
1529
1530void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
1531{
1532 sl->timer.function = hrtimer_wakeup;
1533 sl->task = task;
1534}
1535EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
1536
1537static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
1538{
1539 hrtimer_init_sleeper(t, current);
1540
1541 do {
1542 set_current_state(TASK_INTERRUPTIBLE);
1543 hrtimer_start_expires(&t->timer, mode);
1544 if (!hrtimer_active(&t->timer))
1545 t->task = NULL;
1546
1547 if (likely(t->task))
1548 schedule();
1549
1550 hrtimer_cancel(&t->timer);
1551 mode = HRTIMER_MODE_ABS;
1552
1553 } while (t->task && !signal_pending(current));
1554
1555 __set_current_state(TASK_RUNNING);
1556
1557 return t->task == NULL;
1558}
1559
1560static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp)
1561{
1562 struct timespec rmt;
1563 ktime_t rem;
1564
1565 rem = hrtimer_expires_remaining(timer);
1566 if (rem.tv64 <= 0)
1567 return 0;
1568 rmt = ktime_to_timespec(rem);
1569
1570 if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
1571 return -EFAULT;
1572
1573 return 1;
1574}
1575
1576long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
1577{
1578 struct hrtimer_sleeper t;
1579 struct timespec __user *rmtp;
1580 int ret = 0;
1581
1582 hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid,
1583 HRTIMER_MODE_ABS);
1584 hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
1585
1586 if (do_nanosleep(&t, HRTIMER_MODE_ABS))
1587 goto out;
1588
1589 rmtp = restart->nanosleep.rmtp;
1590 if (rmtp) {
1591 ret = update_rmtp(&t.timer, rmtp);
1592 if (ret <= 0)
1593 goto out;
1594 }
1595
1596
1597 ret = -ERESTART_RESTARTBLOCK;
1598out:
1599 destroy_hrtimer_on_stack(&t.timer);
1600 return ret;
1601}
1602
1603long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
1604 const enum hrtimer_mode mode, const clockid_t clockid)
1605{
1606 struct restart_block *restart;
1607 struct hrtimer_sleeper t;
1608 int ret = 0;
1609 unsigned long slack;
1610
1611 slack = current->timer_slack_ns;
1612 if (rt_task(current))
1613 slack = 0;
1614
1615 hrtimer_init_on_stack(&t.timer, clockid, mode);
1616 hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
1617 if (do_nanosleep(&t, mode))
1618 goto out;
1619
1620
1621 if (mode == HRTIMER_MODE_ABS) {
1622 ret = -ERESTARTNOHAND;
1623 goto out;
1624 }
1625
1626 if (rmtp) {
1627 ret = update_rmtp(&t.timer, rmtp);
1628 if (ret <= 0)
1629 goto out;
1630 }
1631
1632 restart = ¤t_thread_info()->restart_block;
1633 restart->fn = hrtimer_nanosleep_restart;
1634 restart->nanosleep.clockid = t.timer.base->clockid;
1635 restart->nanosleep.rmtp = rmtp;
1636 restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
1637
1638 ret = -ERESTART_RESTARTBLOCK;
1639out:
1640 destroy_hrtimer_on_stack(&t.timer);
1641 return ret;
1642}
1643
1644SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
1645 struct timespec __user *, rmtp)
1646{
1647 struct timespec tu;
1648
1649 if (copy_from_user(&tu, rqtp, sizeof(tu)))
1650 return -EFAULT;
1651
1652 if (!timespec_valid(&tu))
1653 return -EINVAL;
1654
1655 return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
1656}
1657
1658
1659
1660
1661static void __cpuinit init_hrtimers_cpu(int cpu)
1662{
1663 struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
1664 int i;
1665
1666 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
1667 cpu_base->clock_base[i].cpu_base = cpu_base;
1668 timerqueue_init_head(&cpu_base->clock_base[i].active);
1669 }
1670
1671 hrtimer_init_hres(cpu_base);
1672}
1673
1674#ifdef CONFIG_HOTPLUG_CPU
1675
1676static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
1677 struct hrtimer_clock_base *new_base)
1678{
1679 struct hrtimer *timer;
1680 struct timerqueue_node *node;
1681
1682 while ((node = timerqueue_getnext(&old_base->active))) {
1683 timer = container_of(node, struct hrtimer, node);
1684 BUG_ON(hrtimer_callback_running(timer));
1685 debug_deactivate(timer);
1686
1687
1688
1689
1690
1691
1692 __remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0);
1693 timer->base = new_base;
1694
1695
1696
1697
1698
1699
1700
1701
1702 enqueue_hrtimer(timer, new_base);
1703
1704
1705 timer->state &= ~HRTIMER_STATE_MIGRATE;
1706 }
1707}
1708
1709static void migrate_hrtimers(int scpu)
1710{
1711 struct hrtimer_cpu_base *old_base, *new_base;
1712 int i;
1713
1714 BUG_ON(cpu_online(scpu));
1715 tick_cancel_sched_timer(scpu);
1716
1717 local_irq_disable();
1718 old_base = &per_cpu(hrtimer_bases, scpu);
1719 new_base = &__get_cpu_var(hrtimer_bases);
1720
1721
1722
1723
1724 raw_spin_lock(&new_base->lock);
1725 raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
1726
1727 for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
1728 migrate_hrtimer_list(&old_base->clock_base[i],
1729 &new_base->clock_base[i]);
1730 }
1731
1732 raw_spin_unlock(&old_base->lock);
1733 raw_spin_unlock(&new_base->lock);
1734
1735
1736 __hrtimer_peek_ahead_timers();
1737 local_irq_enable();
1738}
1739
1740#endif
1741
1742static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
1743 unsigned long action, void *hcpu)
1744{
1745 int scpu = (long)hcpu;
1746
1747 switch (action) {
1748
1749 case CPU_UP_PREPARE:
1750 case CPU_UP_PREPARE_FROZEN:
1751 init_hrtimers_cpu(scpu);
1752 break;
1753
1754#ifdef CONFIG_HOTPLUG_CPU
1755 case CPU_DYING:
1756 case CPU_DYING_FROZEN:
1757 clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DYING, &scpu);
1758 break;
1759 case CPU_DEAD:
1760 case CPU_DEAD_FROZEN:
1761 {
1762 clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &scpu);
1763 migrate_hrtimers(scpu);
1764 break;
1765 }
1766#endif
1767
1768 default:
1769 break;
1770 }
1771
1772 return NOTIFY_OK;
1773}
1774
1775static struct notifier_block __cpuinitdata hrtimers_nb = {
1776 .notifier_call = hrtimer_cpu_notify,
1777};
1778
1779void __init hrtimers_init(void)
1780{
1781 hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
1782 (void *)(long)smp_processor_id());
1783 register_cpu_notifier(&hrtimers_nb);
1784#ifdef CONFIG_HIGH_RES_TIMERS
1785 open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
1786#endif
1787}
1788
1789
1790
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1795
1796int __sched
1797schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta,
1798 const enum hrtimer_mode mode, int clock)
1799{
1800 struct hrtimer_sleeper t;
1801
1802
1803
1804
1805
1806 if (expires && !expires->tv64) {
1807 __set_current_state(TASK_RUNNING);
1808 return 0;
1809 }
1810
1811
1812
1813
1814 if (!expires) {
1815 schedule();
1816 __set_current_state(TASK_RUNNING);
1817 return -EINTR;
1818 }
1819
1820 hrtimer_init_on_stack(&t.timer, clock, mode);
1821 hrtimer_set_expires_range_ns(&t.timer, *expires, delta);
1822
1823 hrtimer_init_sleeper(&t, current);
1824
1825 hrtimer_start_expires(&t.timer, mode);
1826 if (!hrtimer_active(&t.timer))
1827 t.task = NULL;
1828
1829 if (likely(t.task))
1830 schedule();
1831
1832 hrtimer_cancel(&t.timer);
1833 destroy_hrtimer_on_stack(&t.timer);
1834
1835 __set_current_state(TASK_RUNNING);
1836
1837 return !t.task ? 0 : -EINTR;
1838}
1839
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1867
1868int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta,
1869 const enum hrtimer_mode mode)
1870{
1871 return schedule_hrtimeout_range_clock(expires, delta, mode,
1872 CLOCK_MONOTONIC);
1873}
1874EXPORT_SYMBOL_GPL(schedule_hrtimeout_range);
1875
1876
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1897
1898int __sched schedule_hrtimeout(ktime_t *expires,
1899 const enum hrtimer_mode mode)
1900{
1901 return schedule_hrtimeout_range(expires, 0, mode);
1902}
1903EXPORT_SYMBOL_GPL(schedule_hrtimeout);
1904