Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
58687acb DZ |
2 | /* |
3 | * Detect hard and soft lockups on a system | |
4 | * | |
5 | * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. | |
6 | * | |
86f5e6a7 FLVC |
7 | * Note: Most of this code is borrowed heavily from the original softlockup |
8 | * detector, so thanks to Ingo for the initial implementation. | |
9 | * Some chunks also taken from the old x86-specific nmi watchdog code, thanks | |
58687acb DZ |
10 | * to those contributors as well. |
11 | */ | |
12 | ||
5f92a7b0 | 13 | #define pr_fmt(fmt) "watchdog: " fmt |
4501980a | 14 | |
58687acb DZ |
15 | #include <linux/mm.h> |
16 | #include <linux/cpu.h> | |
17 | #include <linux/nmi.h> | |
18 | #include <linux/init.h> | |
58687acb DZ |
19 | #include <linux/module.h> |
20 | #include <linux/sysctl.h> | |
fe4ba3c3 | 21 | #include <linux/tick.h> |
e6017571 | 22 | #include <linux/sched/clock.h> |
b17b0153 | 23 | #include <linux/sched/debug.h> |
78634061 | 24 | #include <linux/sched/isolation.h> |
9cf57731 | 25 | #include <linux/stop_machine.h> |
58687acb DZ |
26 | |
27 | #include <asm/irq_regs.h> | |
5d1c0f4a | 28 | #include <linux/kvm_para.h> |
58687acb | 29 | |
946d1977 | 30 | static DEFINE_MUTEX(watchdog_mutex); |
ab992dc3 | 31 | |
05a4a952 | 32 | #if defined(CONFIG_HARDLOCKUP_DETECTOR) || defined(CONFIG_HAVE_NMI_WATCHDOG) |
df95d308 | 33 | # define WATCHDOG_HARDLOCKUP_DEFAULT 1 |
84d56e66 | 34 | #else |
df95d308 | 35 | # define WATCHDOG_HARDLOCKUP_DEFAULT 0 |
84d56e66 | 36 | #endif |
05a4a952 | 37 | |
09154985 TG |
38 | unsigned long __read_mostly watchdog_enabled; |
39 | int __read_mostly watchdog_user_enabled = 1; | |
df95d308 DA |
40 | static int __read_mostly watchdog_hardlockup_user_enabled = WATCHDOG_HARDLOCKUP_DEFAULT; |
41 | static int __read_mostly watchdog_softlockup_user_enabled = 1; | |
7feeb9cd | 42 | int __read_mostly watchdog_thresh = 10; |
df95d308 | 43 | static int __read_mostly watchdog_hardlockup_available; |
7feeb9cd | 44 | |
7feeb9cd TG |
45 | struct cpumask watchdog_cpumask __read_mostly; |
46 | unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask); | |
47 | ||
05a4a952 | 48 | #ifdef CONFIG_HARDLOCKUP_DETECTOR |
f117955a GP |
49 | |
50 | # ifdef CONFIG_SMP | |
51 | int __read_mostly sysctl_hardlockup_all_cpu_backtrace; | |
52 | # endif /* CONFIG_SMP */ | |
53 | ||
05a4a952 NP |
54 | /* |
55 | * Should we panic when a soft-lockup or hard-lockup occurs: | |
56 | */ | |
57 | unsigned int __read_mostly hardlockup_panic = | |
67fca000 | 58 | IS_ENABLED(CONFIG_BOOTPARAM_HARDLOCKUP_PANIC); |
05a4a952 NP |
59 | /* |
60 | * We may not want to enable hard lockup detection by default in all cases, | |
61 | * for example when running the kernel as a guest on a hypervisor. In these | |
62 | * cases this function can be called to disable hard lockup detection. This | |
63 | * function should only be executed once by the boot processor before the | |
64 | * kernel command line parameters are parsed, because otherwise it is not | |
65 | * possible to override this in hardlockup_panic_setup(). | |
66 | */ | |
7a355820 | 67 | void __init hardlockup_detector_disable(void) |
05a4a952 | 68 | { |
df95d308 | 69 | watchdog_hardlockup_user_enabled = 0; |
05a4a952 NP |
70 | } |
71 | ||
72 | static int __init hardlockup_panic_setup(char *str) | |
73 | { | |
74 | if (!strncmp(str, "panic", 5)) | |
75 | hardlockup_panic = 1; | |
76 | else if (!strncmp(str, "nopanic", 7)) | |
77 | hardlockup_panic = 0; | |
78 | else if (!strncmp(str, "0", 1)) | |
df95d308 | 79 | watchdog_hardlockup_user_enabled = 0; |
05a4a952 | 80 | else if (!strncmp(str, "1", 1)) |
df95d308 | 81 | watchdog_hardlockup_user_enabled = 1; |
05a4a952 NP |
82 | return 1; |
83 | } | |
84 | __setup("nmi_watchdog=", hardlockup_panic_setup); | |
85 | ||
368a7e2c | 86 | #endif /* CONFIG_HARDLOCKUP_DETECTOR */ |
05a4a952 | 87 | |
81972551 DA |
88 | #if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF) |
89 | ||
77c12fc9 DA |
90 | static DEFINE_PER_CPU(atomic_t, hrtimer_interrupts); |
91 | static DEFINE_PER_CPU(int, hrtimer_interrupts_saved); | |
1610611a | 92 | static DEFINE_PER_CPU(bool, watchdog_hardlockup_warned); |
ed92e1ef | 93 | static DEFINE_PER_CPU(bool, watchdog_hardlockup_touched); |
1610611a | 94 | static unsigned long watchdog_hardlockup_all_cpu_dumped; |
81972551 | 95 | |
ed92e1ef DA |
96 | notrace void arch_touch_nmi_watchdog(void) |
97 | { | |
98 | /* | |
99 | * Using __raw here because some code paths have | |
100 | * preemption enabled. If preemption is enabled | |
101 | * then interrupts should be enabled too, in which | |
102 | * case we shouldn't have to worry about the watchdog | |
103 | * going off. | |
104 | */ | |
105 | raw_cpu_write(watchdog_hardlockup_touched, true); | |
106 | } | |
107 | EXPORT_SYMBOL(arch_touch_nmi_watchdog); | |
108 | ||
77c12fc9 | 109 | static bool is_hardlockup(unsigned int cpu) |
81972551 | 110 | { |
77c12fc9 | 111 | int hrint = atomic_read(&per_cpu(hrtimer_interrupts, cpu)); |
81972551 | 112 | |
77c12fc9 | 113 | if (per_cpu(hrtimer_interrupts_saved, cpu) == hrint) |
81972551 DA |
114 | return true; |
115 | ||
77c12fc9 DA |
116 | /* |
117 | * NOTE: we don't need any fancy atomic_t or READ_ONCE/WRITE_ONCE | |
118 | * for hrtimer_interrupts_saved. hrtimer_interrupts_saved is | |
119 | * written/read by a single CPU. | |
120 | */ | |
121 | per_cpu(hrtimer_interrupts_saved, cpu) = hrint; | |
1610611a | 122 | |
81972551 DA |
123 | return false; |
124 | } | |
125 | ||
126 | static void watchdog_hardlockup_kick(void) | |
127 | { | |
77c12fc9 | 128 | atomic_inc(raw_cpu_ptr(&hrtimer_interrupts)); |
81972551 DA |
129 | } |
130 | ||
77c12fc9 | 131 | void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs) |
81972551 | 132 | { |
ed92e1ef DA |
133 | if (per_cpu(watchdog_hardlockup_touched, cpu)) { |
134 | per_cpu(watchdog_hardlockup_touched, cpu) = false; | |
135 | return; | |
136 | } | |
137 | ||
1610611a DA |
138 | /* |
139 | * Check for a hardlockup by making sure the CPU's timer | |
140 | * interrupt is incrementing. The timer interrupt should have | |
141 | * fired multiple times before we overflow'd. If it hasn't | |
81972551 DA |
142 | * then this is a good indication the cpu is stuck |
143 | */ | |
77c12fc9 | 144 | if (is_hardlockup(cpu)) { |
1610611a | 145 | unsigned int this_cpu = smp_processor_id(); |
77c12fc9 | 146 | struct cpumask backtrace_mask = *cpu_online_mask; |
81972551 | 147 | |
1610611a | 148 | /* Only print hardlockups once. */ |
77c12fc9 | 149 | if (per_cpu(watchdog_hardlockup_warned, cpu)) |
81972551 DA |
150 | return; |
151 | ||
77c12fc9 | 152 | pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n", cpu); |
81972551 DA |
153 | print_modules(); |
154 | print_irqtrace_events(current); | |
77c12fc9 DA |
155 | if (cpu == this_cpu) { |
156 | if (regs) | |
157 | show_regs(regs); | |
158 | else | |
159 | dump_stack(); | |
160 | cpumask_clear_cpu(cpu, &backtrace_mask); | |
161 | } else { | |
162 | if (trigger_single_cpu_backtrace(cpu)) | |
163 | cpumask_clear_cpu(cpu, &backtrace_mask); | |
164 | } | |
81972551 DA |
165 | |
166 | /* | |
77c12fc9 DA |
167 | * Perform multi-CPU dump only once to avoid multiple |
168 | * hardlockups generating interleaving traces | |
81972551 DA |
169 | */ |
170 | if (sysctl_hardlockup_all_cpu_backtrace && | |
1610611a | 171 | !test_and_set_bit(0, &watchdog_hardlockup_all_cpu_dumped)) |
77c12fc9 | 172 | trigger_cpumask_backtrace(&backtrace_mask); |
81972551 DA |
173 | |
174 | if (hardlockup_panic) | |
175 | nmi_panic(regs, "Hard LOCKUP"); | |
176 | ||
77c12fc9 | 177 | per_cpu(watchdog_hardlockup_warned, cpu) = true; |
1610611a | 178 | } else { |
77c12fc9 | 179 | per_cpu(watchdog_hardlockup_warned, cpu) = false; |
81972551 | 180 | } |
81972551 DA |
181 | } |
182 | ||
183 | #else /* CONFIG_HARDLOCKUP_DETECTOR_PERF */ | |
184 | ||
185 | static inline void watchdog_hardlockup_kick(void) { } | |
186 | ||
187 | #endif /* !CONFIG_HARDLOCKUP_DETECTOR_PERF */ | |
188 | ||
05a4a952 NP |
189 | /* |
190 | * These functions can be overridden if an architecture implements its | |
191 | * own hardlockup detector. | |
a10a842f | 192 | * |
df95d308 | 193 | * watchdog_hardlockup_enable/disable can be implemented to start and stop when |
b124ac45 | 194 | * softlockup watchdog start and stop. The arch must select the |
a10a842f | 195 | * SOFTLOCKUP_DETECTOR Kconfig. |
05a4a952 | 196 | */ |
df95d308 | 197 | void __weak watchdog_hardlockup_enable(unsigned int cpu) |
05a4a952 | 198 | { |
146c9d0e | 199 | hardlockup_detector_perf_enable(); |
05a4a952 | 200 | } |
941154bd | 201 | |
df95d308 | 202 | void __weak watchdog_hardlockup_disable(unsigned int cpu) |
05a4a952 | 203 | { |
941154bd | 204 | hardlockup_detector_perf_disable(); |
05a4a952 NP |
205 | } |
206 | ||
df95d308 DA |
207 | /* Return 0, if a hardlockup watchdog is available. Error code otherwise */ |
208 | int __weak __init watchdog_hardlockup_probe(void) | |
a994a314 TG |
209 | { |
210 | return hardlockup_detector_perf_init(); | |
211 | } | |
212 | ||
6592ad2f | 213 | /** |
df95d308 | 214 | * watchdog_hardlockup_stop - Stop the watchdog for reconfiguration |
6592ad2f | 215 | * |
6b9dc480 | 216 | * The reconfiguration steps are: |
df95d308 | 217 | * watchdog_hardlockup_stop(); |
6592ad2f | 218 | * update_variables(); |
df95d308 | 219 | * watchdog_hardlockup_start(); |
6b9dc480 | 220 | */ |
df95d308 | 221 | void __weak watchdog_hardlockup_stop(void) { } |
6b9dc480 TG |
222 | |
223 | /** | |
df95d308 | 224 | * watchdog_hardlockup_start - Start the watchdog after reconfiguration |
6592ad2f | 225 | * |
df95d308 | 226 | * Counterpart to watchdog_hardlockup_stop(). |
6b9dc480 TG |
227 | * |
228 | * The following variables have been updated in update_variables() and | |
229 | * contain the currently valid configuration: | |
7feeb9cd | 230 | * - watchdog_enabled |
a10a842f NP |
231 | * - watchdog_thresh |
232 | * - watchdog_cpumask | |
a10a842f | 233 | */ |
df95d308 | 234 | void __weak watchdog_hardlockup_start(void) { } |
a10a842f | 235 | |
09154985 TG |
236 | /** |
237 | * lockup_detector_update_enable - Update the sysctl enable bit | |
238 | * | |
df95d308 DA |
239 | * Caller needs to make sure that the hard watchdogs are off, so this |
240 | * can't race with watchdog_hardlockup_disable(). | |
09154985 TG |
241 | */ |
242 | static void lockup_detector_update_enable(void) | |
243 | { | |
244 | watchdog_enabled = 0; | |
245 | if (!watchdog_user_enabled) | |
246 | return; | |
df95d308 DA |
247 | if (watchdog_hardlockup_available && watchdog_hardlockup_user_enabled) |
248 | watchdog_enabled |= WATCHDOG_HARDLOCKUP_ENABLED; | |
249 | if (watchdog_softlockup_user_enabled) | |
250 | watchdog_enabled |= WATCHDOG_SOFTOCKUP_ENABLED; | |
09154985 TG |
251 | } |
252 | ||
05a4a952 NP |
253 | #ifdef CONFIG_SOFTLOCKUP_DETECTOR |
254 | ||
fef06efc PM |
255 | /* |
256 | * Delay the soflockup report when running a known slow code. | |
257 | * It does _not_ affect the timestamp of the last successdul reschedule. | |
258 | */ | |
259 | #define SOFTLOCKUP_DELAY_REPORT ULONG_MAX | |
11e31f60 | 260 | |
f117955a GP |
261 | #ifdef CONFIG_SMP |
262 | int __read_mostly sysctl_softlockup_all_cpu_backtrace; | |
263 | #endif | |
264 | ||
e7e04615 SS |
265 | static struct cpumask watchdog_allowed_mask __read_mostly; |
266 | ||
2b9d7f23 TG |
267 | /* Global variables, exported for sysctl */ |
268 | unsigned int __read_mostly softlockup_panic = | |
67fca000 | 269 | IS_ENABLED(CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC); |
2eb2527f | 270 | |
9cf57731 | 271 | static bool softlockup_initialized __read_mostly; |
0f34c400 | 272 | static u64 __read_mostly sample_period; |
58687acb | 273 | |
fef06efc | 274 | /* Timestamp taken after the last successful reschedule. */ |
58687acb | 275 | static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts); |
fef06efc PM |
276 | /* Timestamp of the last softlockup report. */ |
277 | static DEFINE_PER_CPU(unsigned long, watchdog_report_ts); | |
58687acb DZ |
278 | static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer); |
279 | static DEFINE_PER_CPU(bool, softlockup_touch_sync); | |
ed235875 | 280 | static unsigned long soft_lockup_nmi_warn; |
58687acb | 281 | |
58687acb DZ |
282 | static int __init nowatchdog_setup(char *str) |
283 | { | |
09154985 | 284 | watchdog_user_enabled = 0; |
58687acb DZ |
285 | return 1; |
286 | } | |
287 | __setup("nowatchdog", nowatchdog_setup); | |
288 | ||
58687acb DZ |
289 | static int __init nosoftlockup_setup(char *str) |
290 | { | |
df95d308 | 291 | watchdog_softlockup_user_enabled = 0; |
58687acb DZ |
292 | return 1; |
293 | } | |
294 | __setup("nosoftlockup", nosoftlockup_setup); | |
195daf66 | 295 | |
11295055 LO |
296 | static int __init watchdog_thresh_setup(char *str) |
297 | { | |
298 | get_option(&str, &watchdog_thresh); | |
299 | return 1; | |
300 | } | |
301 | __setup("watchdog_thresh=", watchdog_thresh_setup); | |
302 | ||
941154bd TG |
303 | static void __lockup_detector_cleanup(void); |
304 | ||
4eec42f3 MSB |
305 | /* |
306 | * Hard-lockup warnings should be triggered after just a few seconds. Soft- | |
307 | * lockups can have false positives under extreme conditions. So we generally | |
308 | * want a higher threshold for soft lockups than for hard lockups. So we couple | |
309 | * the thresholds with a factor: we make the soft threshold twice the amount of | |
310 | * time the hard threshold is. | |
311 | */ | |
6e9101ae | 312 | static int get_softlockup_thresh(void) |
4eec42f3 MSB |
313 | { |
314 | return watchdog_thresh * 2; | |
315 | } | |
58687acb DZ |
316 | |
317 | /* | |
318 | * Returns seconds, approximately. We don't need nanosecond | |
319 | * resolution, and we don't need to waste time with a big divide when | |
320 | * 2^30ns == 1.074s. | |
321 | */ | |
c06b4f19 | 322 | static unsigned long get_timestamp(void) |
58687acb | 323 | { |
545a2bf7 | 324 | return running_clock() >> 30LL; /* 2^30 ~= 10^9 */ |
58687acb DZ |
325 | } |
326 | ||
0f34c400 | 327 | static void set_sample_period(void) |
58687acb DZ |
328 | { |
329 | /* | |
586692a5 | 330 | * convert watchdog_thresh from seconds to ns |
86f5e6a7 FLVC |
331 | * the divide by 5 is to give hrtimer several chances (two |
332 | * or three with the current relation between the soft | |
333 | * and hard thresholds) to increment before the | |
334 | * hardlockup detector generates a warning | |
58687acb | 335 | */ |
0f34c400 | 336 | sample_period = get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5); |
7edaeb68 | 337 | watchdog_update_hrtimer_threshold(sample_period); |
58687acb DZ |
338 | } |
339 | ||
fef06efc PM |
340 | static void update_report_ts(void) |
341 | { | |
342 | __this_cpu_write(watchdog_report_ts, get_timestamp()); | |
343 | } | |
344 | ||
58687acb | 345 | /* Commands for resetting the watchdog */ |
7c0012f5 | 346 | static void update_touch_ts(void) |
58687acb | 347 | { |
c06b4f19 | 348 | __this_cpu_write(watchdog_touch_ts, get_timestamp()); |
fef06efc | 349 | update_report_ts(); |
58687acb DZ |
350 | } |
351 | ||
03e0d461 TH |
352 | /** |
353 | * touch_softlockup_watchdog_sched - touch watchdog on scheduler stalls | |
354 | * | |
355 | * Call when the scheduler may have stalled for legitimate reasons | |
356 | * preventing the watchdog task from executing - e.g. the scheduler | |
357 | * entering idle state. This should only be used for scheduler events. | |
358 | * Use touch_softlockup_watchdog() for everything else. | |
359 | */ | |
cb9d7fd5 | 360 | notrace void touch_softlockup_watchdog_sched(void) |
58687acb | 361 | { |
7861144b | 362 | /* |
fef06efc PM |
363 | * Preemption can be enabled. It doesn't matter which CPU's watchdog |
364 | * report period gets restarted here, so use the raw_ operation. | |
7861144b | 365 | */ |
fef06efc | 366 | raw_cpu_write(watchdog_report_ts, SOFTLOCKUP_DELAY_REPORT); |
58687acb | 367 | } |
03e0d461 | 368 | |
cb9d7fd5 | 369 | notrace void touch_softlockup_watchdog(void) |
03e0d461 TH |
370 | { |
371 | touch_softlockup_watchdog_sched(); | |
82607adc | 372 | wq_watchdog_touch(raw_smp_processor_id()); |
03e0d461 | 373 | } |
0167c781 | 374 | EXPORT_SYMBOL(touch_softlockup_watchdog); |
58687acb | 375 | |
332fbdbc | 376 | void touch_all_softlockup_watchdogs(void) |
58687acb DZ |
377 | { |
378 | int cpu; | |
379 | ||
380 | /* | |
d57108d4 TG |
381 | * watchdog_mutex cannpt be taken here, as this might be called |
382 | * from (soft)interrupt context, so the access to | |
383 | * watchdog_allowed_cpumask might race with a concurrent update. | |
384 | * | |
385 | * The watchdog time stamp can race against a concurrent real | |
386 | * update as well, the only side effect might be a cycle delay for | |
387 | * the softlockup check. | |
58687acb | 388 | */ |
89e28ce6 | 389 | for_each_cpu(cpu, &watchdog_allowed_mask) { |
fef06efc | 390 | per_cpu(watchdog_report_ts, cpu) = SOFTLOCKUP_DELAY_REPORT; |
89e28ce6 WQ |
391 | wq_watchdog_touch(cpu); |
392 | } | |
58687acb DZ |
393 | } |
394 | ||
58687acb DZ |
395 | void touch_softlockup_watchdog_sync(void) |
396 | { | |
f7f66b05 | 397 | __this_cpu_write(softlockup_touch_sync, true); |
fef06efc | 398 | __this_cpu_write(watchdog_report_ts, SOFTLOCKUP_DELAY_REPORT); |
58687acb DZ |
399 | } |
400 | ||
0f90b88d PM |
401 | static int is_softlockup(unsigned long touch_ts, |
402 | unsigned long period_ts, | |
403 | unsigned long now) | |
58687acb | 404 | { |
df95d308 | 405 | if ((watchdog_enabled & WATCHDOG_SOFTOCKUP_ENABLED) && watchdog_thresh) { |
195daf66 | 406 | /* Warn about unreasonable delays. */ |
fef06efc | 407 | if (time_after(now, period_ts + get_softlockup_thresh())) |
195daf66 UO |
408 | return now - touch_ts; |
409 | } | |
58687acb DZ |
410 | return 0; |
411 | } | |
412 | ||
05a4a952 | 413 | /* watchdog detector functions */ |
be45bf53 PZ |
414 | static DEFINE_PER_CPU(struct completion, softlockup_completion); |
415 | static DEFINE_PER_CPU(struct cpu_stop_work, softlockup_stop_work); | |
416 | ||
9cf57731 | 417 | /* |
b124ac45 | 418 | * The watchdog feed function - touches the timestamp. |
9cf57731 PZ |
419 | * |
420 | * It only runs once every sample_period seconds (4 seconds by | |
421 | * default) to reset the softlockup timestamp. If this gets delayed | |
422 | * for more than 2*watchdog_thresh seconds then the debug-printout | |
423 | * triggers in watchdog_timer_fn(). | |
424 | */ | |
425 | static int softlockup_fn(void *data) | |
426 | { | |
7c0012f5 | 427 | update_touch_ts(); |
be45bf53 | 428 | complete(this_cpu_ptr(&softlockup_completion)); |
9cf57731 PZ |
429 | |
430 | return 0; | |
431 | } | |
432 | ||
58687acb DZ |
433 | /* watchdog kicker functions */ |
434 | static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) | |
435 | { | |
0f90b88d | 436 | unsigned long touch_ts, period_ts, now; |
58687acb DZ |
437 | struct pt_regs *regs = get_irq_regs(); |
438 | int duration; | |
ed235875 | 439 | int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace; |
58687acb | 440 | |
01f0a027 | 441 | if (!watchdog_enabled) |
b94f5118 DZ |
442 | return HRTIMER_NORESTART; |
443 | ||
81972551 | 444 | watchdog_hardlockup_kick(); |
58687acb DZ |
445 | |
446 | /* kick the softlockup detector */ | |
be45bf53 PZ |
447 | if (completion_done(this_cpu_ptr(&softlockup_completion))) { |
448 | reinit_completion(this_cpu_ptr(&softlockup_completion)); | |
449 | stop_one_cpu_nowait(smp_processor_id(), | |
450 | softlockup_fn, NULL, | |
451 | this_cpu_ptr(&softlockup_stop_work)); | |
452 | } | |
58687acb DZ |
453 | |
454 | /* .. and repeat */ | |
0f34c400 | 455 | hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period)); |
58687acb | 456 | |
0f90b88d PM |
457 | /* |
458 | * Read the current timestamp first. It might become invalid anytime | |
459 | * when a virtual machine is stopped by the host or when the watchog | |
460 | * is touched from NMI. | |
461 | */ | |
462 | now = get_timestamp(); | |
9bf3bc94 PM |
463 | /* |
464 | * If a virtual machine is stopped by the host it can look to | |
0f90b88d | 465 | * the watchdog like a soft lockup. This function touches the watchdog. |
9bf3bc94 PM |
466 | */ |
467 | kvm_check_and_clear_guest_paused(); | |
0f90b88d PM |
468 | /* |
469 | * The stored timestamp is comparable with @now only when not touched. | |
470 | * It might get touched anytime from NMI. Make sure that is_softlockup() | |
471 | * uses the same (valid) value. | |
472 | */ | |
473 | period_ts = READ_ONCE(*this_cpu_ptr(&watchdog_report_ts)); | |
9bf3bc94 PM |
474 | |
475 | /* Reset the interval when touched by known problematic code. */ | |
fef06efc | 476 | if (period_ts == SOFTLOCKUP_DELAY_REPORT) { |
909ea964 | 477 | if (unlikely(__this_cpu_read(softlockup_touch_sync))) { |
58687acb DZ |
478 | /* |
479 | * If the time stamp was touched atomically | |
480 | * make sure the scheduler tick is up to date. | |
481 | */ | |
909ea964 | 482 | __this_cpu_write(softlockup_touch_sync, false); |
58687acb DZ |
483 | sched_clock_tick(); |
484 | } | |
5d1c0f4a | 485 | |
fef06efc | 486 | update_report_ts(); |
58687acb DZ |
487 | return HRTIMER_RESTART; |
488 | } | |
489 | ||
0f90b88d PM |
490 | /* Check for a softlockup. */ |
491 | touch_ts = __this_cpu_read(watchdog_touch_ts); | |
492 | duration = is_softlockup(touch_ts, period_ts, now); | |
58687acb | 493 | if (unlikely(duration)) { |
9f113bf7 PM |
494 | /* |
495 | * Prevent multiple soft-lockup reports if one cpu is already | |
496 | * engaged in dumping all cpu back traces. | |
497 | */ | |
ed235875 | 498 | if (softlockup_all_cpu_backtrace) { |
9f113bf7 | 499 | if (test_and_set_bit_lock(0, &soft_lockup_nmi_warn)) |
ed235875 | 500 | return HRTIMER_RESTART; |
ed235875 AT |
501 | } |
502 | ||
c9ad17c9 | 503 | /* Start period for the next softlockup warning. */ |
fef06efc | 504 | update_report_ts(); |
c9ad17c9 | 505 | |
656c3b79 | 506 | pr_emerg("BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n", |
26e09c6e | 507 | smp_processor_id(), duration, |
58687acb DZ |
508 | current->comm, task_pid_nr(current)); |
509 | print_modules(); | |
510 | print_irqtrace_events(current); | |
511 | if (regs) | |
512 | show_regs(regs); | |
513 | else | |
514 | dump_stack(); | |
515 | ||
ed235875 | 516 | if (softlockup_all_cpu_backtrace) { |
ed235875 | 517 | trigger_allbutself_cpu_backtrace(); |
9f113bf7 | 518 | clear_bit_unlock(0, &soft_lockup_nmi_warn); |
ed235875 AT |
519 | } |
520 | ||
69361eef | 521 | add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK); |
58687acb DZ |
522 | if (softlockup_panic) |
523 | panic("softlockup: hung tasks"); | |
1bc503cb | 524 | } |
58687acb DZ |
525 | |
526 | return HRTIMER_RESTART; | |
527 | } | |
528 | ||
bcd951cf | 529 | static void watchdog_enable(unsigned int cpu) |
58687acb | 530 | { |
01f0a027 | 531 | struct hrtimer *hrtimer = this_cpu_ptr(&watchdog_hrtimer); |
be45bf53 | 532 | struct completion *done = this_cpu_ptr(&softlockup_completion); |
58687acb | 533 | |
9cf57731 PZ |
534 | WARN_ON_ONCE(cpu != smp_processor_id()); |
535 | ||
be45bf53 PZ |
536 | init_completion(done); |
537 | complete(done); | |
538 | ||
01f0a027 | 539 | /* |
df95d308 | 540 | * Start the timer first to prevent the hardlockup watchdog triggering |
01f0a027 TG |
541 | * before the timer has a chance to fire. |
542 | */ | |
d2ab4cf4 | 543 | hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD); |
3935e895 | 544 | hrtimer->function = watchdog_timer_fn; |
01f0a027 | 545 | hrtimer_start(hrtimer, ns_to_ktime(sample_period), |
d2ab4cf4 | 546 | HRTIMER_MODE_REL_PINNED_HARD); |
3935e895 | 547 | |
01f0a027 | 548 | /* Initialize timestamp */ |
7c0012f5 | 549 | update_touch_ts(); |
df95d308 DA |
550 | /* Enable the hardlockup detector */ |
551 | if (watchdog_enabled & WATCHDOG_HARDLOCKUP_ENABLED) | |
552 | watchdog_hardlockup_enable(cpu); | |
bcd951cf | 553 | } |
58687acb | 554 | |
bcd951cf TG |
555 | static void watchdog_disable(unsigned int cpu) |
556 | { | |
01f0a027 | 557 | struct hrtimer *hrtimer = this_cpu_ptr(&watchdog_hrtimer); |
58687acb | 558 | |
9cf57731 PZ |
559 | WARN_ON_ONCE(cpu != smp_processor_id()); |
560 | ||
01f0a027 | 561 | /* |
df95d308 DA |
562 | * Disable the hardlockup detector first. That prevents that a large |
563 | * delay between disabling the timer and disabling the hardlockup | |
564 | * detector causes a false positive. | |
01f0a027 | 565 | */ |
df95d308 | 566 | watchdog_hardlockup_disable(cpu); |
01f0a027 | 567 | hrtimer_cancel(hrtimer); |
be45bf53 | 568 | wait_for_completion(this_cpu_ptr(&softlockup_completion)); |
58687acb DZ |
569 | } |
570 | ||
9cf57731 | 571 | static int softlockup_stop_fn(void *data) |
b8900bc0 | 572 | { |
9cf57731 PZ |
573 | watchdog_disable(smp_processor_id()); |
574 | return 0; | |
b8900bc0 FW |
575 | } |
576 | ||
9cf57731 | 577 | static void softlockup_stop_all(void) |
bcd951cf | 578 | { |
9cf57731 PZ |
579 | int cpu; |
580 | ||
581 | if (!softlockup_initialized) | |
582 | return; | |
583 | ||
584 | for_each_cpu(cpu, &watchdog_allowed_mask) | |
585 | smp_call_on_cpu(cpu, softlockup_stop_fn, NULL, false); | |
586 | ||
587 | cpumask_clear(&watchdog_allowed_mask); | |
bcd951cf TG |
588 | } |
589 | ||
9cf57731 | 590 | static int softlockup_start_fn(void *data) |
bcd951cf | 591 | { |
9cf57731 PZ |
592 | watchdog_enable(smp_processor_id()); |
593 | return 0; | |
bcd951cf | 594 | } |
58687acb | 595 | |
9cf57731 | 596 | static void softlockup_start_all(void) |
2eb2527f | 597 | { |
9cf57731 | 598 | int cpu; |
2eb2527f | 599 | |
9cf57731 PZ |
600 | cpumask_copy(&watchdog_allowed_mask, &watchdog_cpumask); |
601 | for_each_cpu(cpu, &watchdog_allowed_mask) | |
602 | smp_call_on_cpu(cpu, softlockup_start_fn, NULL, false); | |
2eb2527f TG |
603 | } |
604 | ||
9cf57731 | 605 | int lockup_detector_online_cpu(unsigned int cpu) |
2eb2527f | 606 | { |
7dd47617 TG |
607 | if (cpumask_test_cpu(cpu, &watchdog_allowed_mask)) |
608 | watchdog_enable(cpu); | |
9cf57731 | 609 | return 0; |
2eb2527f TG |
610 | } |
611 | ||
9cf57731 | 612 | int lockup_detector_offline_cpu(unsigned int cpu) |
2eb2527f | 613 | { |
7dd47617 TG |
614 | if (cpumask_test_cpu(cpu, &watchdog_allowed_mask)) |
615 | watchdog_disable(cpu); | |
9cf57731 | 616 | return 0; |
2eb2527f TG |
617 | } |
618 | ||
7c56a873 | 619 | static void __lockup_detector_reconfigure(void) |
2eb2527f | 620 | { |
e31d6883 | 621 | cpus_read_lock(); |
df95d308 | 622 | watchdog_hardlockup_stop(); |
9cf57731 PZ |
623 | |
624 | softlockup_stop_all(); | |
2eb2527f | 625 | set_sample_period(); |
09154985 TG |
626 | lockup_detector_update_enable(); |
627 | if (watchdog_enabled && watchdog_thresh) | |
9cf57731 PZ |
628 | softlockup_start_all(); |
629 | ||
df95d308 | 630 | watchdog_hardlockup_start(); |
e31d6883 TG |
631 | cpus_read_unlock(); |
632 | /* | |
633 | * Must be called outside the cpus locked section to prevent | |
634 | * recursive locking in the perf code. | |
635 | */ | |
636 | __lockup_detector_cleanup(); | |
2eb2527f TG |
637 | } |
638 | ||
7c56a873 LD |
639 | void lockup_detector_reconfigure(void) |
640 | { | |
641 | mutex_lock(&watchdog_mutex); | |
642 | __lockup_detector_reconfigure(); | |
643 | mutex_unlock(&watchdog_mutex); | |
644 | } | |
645 | ||
2eb2527f | 646 | /* |
b124ac45 | 647 | * Create the watchdog infrastructure and configure the detector(s). |
2eb2527f | 648 | */ |
5587185d | 649 | static __init void lockup_detector_setup(void) |
2eb2527f | 650 | { |
2eb2527f TG |
651 | /* |
652 | * If sysctl is off and watchdog got disabled on the command line, | |
653 | * nothing to do here. | |
654 | */ | |
09154985 TG |
655 | lockup_detector_update_enable(); |
656 | ||
2eb2527f TG |
657 | if (!IS_ENABLED(CONFIG_SYSCTL) && |
658 | !(watchdog_enabled && watchdog_thresh)) | |
659 | return; | |
660 | ||
2eb2527f | 661 | mutex_lock(&watchdog_mutex); |
7c56a873 | 662 | __lockup_detector_reconfigure(); |
9cf57731 | 663 | softlockup_initialized = true; |
2eb2527f TG |
664 | mutex_unlock(&watchdog_mutex); |
665 | } | |
666 | ||
2b9d7f23 | 667 | #else /* CONFIG_SOFTLOCKUP_DETECTOR */ |
7c56a873 | 668 | static void __lockup_detector_reconfigure(void) |
6592ad2f | 669 | { |
e31d6883 | 670 | cpus_read_lock(); |
df95d308 | 671 | watchdog_hardlockup_stop(); |
09154985 | 672 | lockup_detector_update_enable(); |
df95d308 | 673 | watchdog_hardlockup_start(); |
e31d6883 | 674 | cpus_read_unlock(); |
6592ad2f | 675 | } |
7c56a873 LD |
676 | void lockup_detector_reconfigure(void) |
677 | { | |
678 | __lockup_detector_reconfigure(); | |
679 | } | |
5587185d | 680 | static inline void lockup_detector_setup(void) |
34ddaa3e | 681 | { |
7c56a873 | 682 | __lockup_detector_reconfigure(); |
34ddaa3e | 683 | } |
2b9d7f23 | 684 | #endif /* !CONFIG_SOFTLOCKUP_DETECTOR */ |
05a4a952 | 685 | |
941154bd TG |
686 | static void __lockup_detector_cleanup(void) |
687 | { | |
688 | lockdep_assert_held(&watchdog_mutex); | |
689 | hardlockup_detector_perf_cleanup(); | |
690 | } | |
691 | ||
692 | /** | |
693 | * lockup_detector_cleanup - Cleanup after cpu hotplug or sysctl changes | |
694 | * | |
695 | * Caller must not hold the cpu hotplug rwsem. | |
696 | */ | |
697 | void lockup_detector_cleanup(void) | |
698 | { | |
699 | mutex_lock(&watchdog_mutex); | |
700 | __lockup_detector_cleanup(); | |
701 | mutex_unlock(&watchdog_mutex); | |
702 | } | |
703 | ||
6554fd8c TG |
704 | /** |
705 | * lockup_detector_soft_poweroff - Interface to stop lockup detector(s) | |
706 | * | |
707 | * Special interface for parisc. It prevents lockup detector warnings from | |
708 | * the default pm_poweroff() function which busy loops forever. | |
709 | */ | |
710 | void lockup_detector_soft_poweroff(void) | |
711 | { | |
712 | watchdog_enabled = 0; | |
713 | } | |
714 | ||
58cf690a UO |
715 | #ifdef CONFIG_SYSCTL |
716 | ||
b124ac45 | 717 | /* Propagate any changes to the watchdog infrastructure */ |
d57108d4 | 718 | static void proc_watchdog_update(void) |
a0c9cbb9 | 719 | { |
e8b62b2d TG |
720 | /* Remove impossible cpus to keep sysctl output clean. */ |
721 | cpumask_and(&watchdog_cpumask, &watchdog_cpumask, cpu_possible_mask); | |
7c56a873 | 722 | __lockup_detector_reconfigure(); |
a0c9cbb9 UO |
723 | } |
724 | ||
ef246a21 UO |
725 | /* |
726 | * common function for watchdog, nmi_watchdog and soft_watchdog parameter | |
727 | * | |
df95d308 DA |
728 | * caller | table->data points to | 'which' |
729 | * -------------------|----------------------------------|------------------------------- | |
730 | * proc_watchdog | watchdog_user_enabled | WATCHDOG_HARDLOCKUP_ENABLED | | |
731 | * | | WATCHDOG_SOFTOCKUP_ENABLED | |
732 | * -------------------|----------------------------------|------------------------------- | |
733 | * proc_nmi_watchdog | watchdog_hardlockup_user_enabled | WATCHDOG_HARDLOCKUP_ENABLED | |
734 | * -------------------|----------------------------------|------------------------------- | |
735 | * proc_soft_watchdog | watchdog_softlockup_user_enabled | WATCHDOG_SOFTOCKUP_ENABLED | |
ef246a21 UO |
736 | */ |
737 | static int proc_watchdog_common(int which, struct ctl_table *table, int write, | |
32927393 | 738 | void *buffer, size_t *lenp, loff_t *ppos) |
ef246a21 | 739 | { |
09154985 | 740 | int err, old, *param = table->data; |
ef246a21 | 741 | |
946d1977 | 742 | mutex_lock(&watchdog_mutex); |
ef246a21 | 743 | |
ef246a21 | 744 | if (!write) { |
09154985 TG |
745 | /* |
746 | * On read synchronize the userspace interface. This is a | |
747 | * racy snapshot. | |
748 | */ | |
749 | *param = (watchdog_enabled & which) != 0; | |
ef246a21 UO |
750 | err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
751 | } else { | |
09154985 | 752 | old = READ_ONCE(*param); |
ef246a21 | 753 | err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
09154985 | 754 | if (!err && old != READ_ONCE(*param)) |
d57108d4 | 755 | proc_watchdog_update(); |
ef246a21 | 756 | } |
946d1977 | 757 | mutex_unlock(&watchdog_mutex); |
ef246a21 UO |
758 | return err; |
759 | } | |
760 | ||
83a80a39 UO |
761 | /* |
762 | * /proc/sys/kernel/watchdog | |
763 | */ | |
764 | int proc_watchdog(struct ctl_table *table, int write, | |
32927393 | 765 | void *buffer, size_t *lenp, loff_t *ppos) |
83a80a39 | 766 | { |
df95d308 DA |
767 | return proc_watchdog_common(WATCHDOG_HARDLOCKUP_ENABLED | |
768 | WATCHDOG_SOFTOCKUP_ENABLED, | |
83a80a39 UO |
769 | table, write, buffer, lenp, ppos); |
770 | } | |
771 | ||
772 | /* | |
773 | * /proc/sys/kernel/nmi_watchdog | |
58687acb | 774 | */ |
83a80a39 | 775 | int proc_nmi_watchdog(struct ctl_table *table, int write, |
32927393 | 776 | void *buffer, size_t *lenp, loff_t *ppos) |
83a80a39 | 777 | { |
df95d308 | 778 | if (!watchdog_hardlockup_available && write) |
a994a314 | 779 | return -ENOTSUPP; |
df95d308 | 780 | return proc_watchdog_common(WATCHDOG_HARDLOCKUP_ENABLED, |
83a80a39 UO |
781 | table, write, buffer, lenp, ppos); |
782 | } | |
783 | ||
784 | /* | |
785 | * /proc/sys/kernel/soft_watchdog | |
786 | */ | |
787 | int proc_soft_watchdog(struct ctl_table *table, int write, | |
32927393 | 788 | void *buffer, size_t *lenp, loff_t *ppos) |
83a80a39 | 789 | { |
df95d308 | 790 | return proc_watchdog_common(WATCHDOG_SOFTOCKUP_ENABLED, |
83a80a39 UO |
791 | table, write, buffer, lenp, ppos); |
792 | } | |
58687acb | 793 | |
83a80a39 UO |
794 | /* |
795 | * /proc/sys/kernel/watchdog_thresh | |
796 | */ | |
797 | int proc_watchdog_thresh(struct ctl_table *table, int write, | |
32927393 | 798 | void *buffer, size_t *lenp, loff_t *ppos) |
58687acb | 799 | { |
d57108d4 | 800 | int err, old; |
58687acb | 801 | |
946d1977 | 802 | mutex_lock(&watchdog_mutex); |
bcd951cf | 803 | |
d57108d4 | 804 | old = READ_ONCE(watchdog_thresh); |
b8900bc0 | 805 | err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
83a80a39 | 806 | |
d57108d4 TG |
807 | if (!err && write && old != READ_ONCE(watchdog_thresh)) |
808 | proc_watchdog_update(); | |
e04ab2bc | 809 | |
946d1977 | 810 | mutex_unlock(&watchdog_mutex); |
b8900bc0 | 811 | return err; |
58687acb | 812 | } |
fe4ba3c3 CM |
813 | |
814 | /* | |
815 | * The cpumask is the mask of possible cpus that the watchdog can run | |
816 | * on, not the mask of cpus it is actually running on. This allows the | |
817 | * user to specify a mask that will include cpus that have not yet | |
818 | * been brought online, if desired. | |
819 | */ | |
820 | int proc_watchdog_cpumask(struct ctl_table *table, int write, | |
32927393 | 821 | void *buffer, size_t *lenp, loff_t *ppos) |
fe4ba3c3 CM |
822 | { |
823 | int err; | |
824 | ||
946d1977 | 825 | mutex_lock(&watchdog_mutex); |
8c073d27 | 826 | |
fe4ba3c3 | 827 | err = proc_do_large_bitmap(table, write, buffer, lenp, ppos); |
05ba3de7 | 828 | if (!err && write) |
e8b62b2d | 829 | proc_watchdog_update(); |
5490125d | 830 | |
946d1977 | 831 | mutex_unlock(&watchdog_mutex); |
fe4ba3c3 CM |
832 | return err; |
833 | } | |
dd0693fd XN |
834 | |
835 | static const int sixty = 60; | |
836 | ||
837 | static struct ctl_table watchdog_sysctls[] = { | |
838 | { | |
839 | .procname = "watchdog", | |
840 | .data = &watchdog_user_enabled, | |
841 | .maxlen = sizeof(int), | |
842 | .mode = 0644, | |
843 | .proc_handler = proc_watchdog, | |
844 | .extra1 = SYSCTL_ZERO, | |
845 | .extra2 = SYSCTL_ONE, | |
846 | }, | |
847 | { | |
848 | .procname = "watchdog_thresh", | |
849 | .data = &watchdog_thresh, | |
850 | .maxlen = sizeof(int), | |
851 | .mode = 0644, | |
852 | .proc_handler = proc_watchdog_thresh, | |
853 | .extra1 = SYSCTL_ZERO, | |
854 | .extra2 = (void *)&sixty, | |
855 | }, | |
856 | { | |
857 | .procname = "nmi_watchdog", | |
df95d308 | 858 | .data = &watchdog_hardlockup_user_enabled, |
dd0693fd XN |
859 | .maxlen = sizeof(int), |
860 | .mode = NMI_WATCHDOG_SYSCTL_PERM, | |
861 | .proc_handler = proc_nmi_watchdog, | |
862 | .extra1 = SYSCTL_ZERO, | |
863 | .extra2 = SYSCTL_ONE, | |
864 | }, | |
865 | { | |
866 | .procname = "watchdog_cpumask", | |
867 | .data = &watchdog_cpumask_bits, | |
868 | .maxlen = NR_CPUS, | |
869 | .mode = 0644, | |
870 | .proc_handler = proc_watchdog_cpumask, | |
871 | }, | |
872 | #ifdef CONFIG_SOFTLOCKUP_DETECTOR | |
873 | { | |
874 | .procname = "soft_watchdog", | |
df95d308 | 875 | .data = &watchdog_softlockup_user_enabled, |
dd0693fd XN |
876 | .maxlen = sizeof(int), |
877 | .mode = 0644, | |
878 | .proc_handler = proc_soft_watchdog, | |
879 | .extra1 = SYSCTL_ZERO, | |
880 | .extra2 = SYSCTL_ONE, | |
881 | }, | |
882 | { | |
883 | .procname = "softlockup_panic", | |
884 | .data = &softlockup_panic, | |
885 | .maxlen = sizeof(int), | |
886 | .mode = 0644, | |
887 | .proc_handler = proc_dointvec_minmax, | |
888 | .extra1 = SYSCTL_ZERO, | |
889 | .extra2 = SYSCTL_ONE, | |
890 | }, | |
891 | #ifdef CONFIG_SMP | |
892 | { | |
893 | .procname = "softlockup_all_cpu_backtrace", | |
894 | .data = &sysctl_softlockup_all_cpu_backtrace, | |
895 | .maxlen = sizeof(int), | |
896 | .mode = 0644, | |
897 | .proc_handler = proc_dointvec_minmax, | |
898 | .extra1 = SYSCTL_ZERO, | |
899 | .extra2 = SYSCTL_ONE, | |
900 | }, | |
901 | #endif /* CONFIG_SMP */ | |
902 | #endif | |
903 | #ifdef CONFIG_HARDLOCKUP_DETECTOR | |
904 | { | |
905 | .procname = "hardlockup_panic", | |
906 | .data = &hardlockup_panic, | |
907 | .maxlen = sizeof(int), | |
908 | .mode = 0644, | |
909 | .proc_handler = proc_dointvec_minmax, | |
910 | .extra1 = SYSCTL_ZERO, | |
911 | .extra2 = SYSCTL_ONE, | |
912 | }, | |
913 | #ifdef CONFIG_SMP | |
914 | { | |
915 | .procname = "hardlockup_all_cpu_backtrace", | |
916 | .data = &sysctl_hardlockup_all_cpu_backtrace, | |
917 | .maxlen = sizeof(int), | |
918 | .mode = 0644, | |
919 | .proc_handler = proc_dointvec_minmax, | |
920 | .extra1 = SYSCTL_ZERO, | |
921 | .extra2 = SYSCTL_ONE, | |
922 | }, | |
923 | #endif /* CONFIG_SMP */ | |
924 | #endif | |
925 | {} | |
926 | }; | |
927 | ||
928 | static void __init watchdog_sysctl_init(void) | |
929 | { | |
930 | register_sysctl_init("kernel", watchdog_sysctls); | |
931 | } | |
932 | #else | |
933 | #define watchdog_sysctl_init() do { } while (0) | |
58687acb DZ |
934 | #endif /* CONFIG_SYSCTL */ |
935 | ||
004417a6 | 936 | void __init lockup_detector_init(void) |
58687acb | 937 | { |
13316b31 | 938 | if (tick_nohz_full_enabled()) |
314b08ff | 939 | pr_info("Disabling watchdog on nohz_full cores by default\n"); |
13316b31 | 940 | |
de201559 | 941 | cpumask_copy(&watchdog_cpumask, |
04d4e665 | 942 | housekeeping_cpumask(HK_TYPE_TIMER)); |
fe4ba3c3 | 943 | |
df95d308 DA |
944 | if (!watchdog_hardlockup_probe()) |
945 | watchdog_hardlockup_available = true; | |
5587185d | 946 | lockup_detector_setup(); |
dd0693fd | 947 | watchdog_sysctl_init(); |
58687acb | 948 | } |