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| author | Richard Cochran <rcochran@linutronix.de> | 2016-07-13 17:16:59 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 10:41:42 +0200 |
| commit | 24f73b99716a9cd8cbb345c41ced6b3b5ed94006 (patch) | |
| tree | 382df7b88299425d8f3af5b050b7ba26273ea0c5 /kernel/cpu.c | |
| parent | 27590dc17b34aedc4f3e14bd107ee59b9db9b0a6 (diff) | |
| download | lwn-24f73b99716a9cd8cbb345c41ced6b3b5ed94006.tar.gz lwn-24f73b99716a9cd8cbb345c41ced6b3b5ed94006.zip | |
timers/core: Convert to hotplug state machine
When tearing down, call timers_dead_cpu() before notify_dead().
There is a hidden dependency between:
- timers
- block multiqueue
- rcutree
If timers_dead_cpu() comes later than blk_mq_queue_reinit_notify()
that latter function causes a RCU stall.
Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.566790058@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 85500e7fe238..e1017d92d308 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1195,6 +1195,11 @@ static struct cpuhp_step cpuhp_bp_states[] = { .startup = hrtimers_prepare_cpu, .teardown = hrtimers_dead_cpu, }, + [CPUHP_TIMERS_DEAD] = { + .name = "timers dead", + .startup = NULL, + .teardown = timers_dead_cpu, + }, /* * Preparatory and dead notifiers. Will be replaced once the notifiers * are converted to states. |