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authorRichard Cochran <rcochran@linutronix.de>2016-07-13 17:16:59 +0000
committerIngo Molnar <mingo@kernel.org>2016-07-15 10:41:42 +0200
commit24f73b99716a9cd8cbb345c41ced6b3b5ed94006 (patch)
tree382df7b88299425d8f3af5b050b7ba26273ea0c5 /include/linux/timer.h
parent27590dc17b34aedc4f3e14bd107ee59b9db9b0a6 (diff)
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 'include/linux/timer.h')
-rw-r--r--include/linux/timer.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 4419506b564e..51d601f192d4 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -273,4 +273,10 @@ unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
unsigned long round_jiffies_up(unsigned long j);
unsigned long round_jiffies_up_relative(unsigned long j);
+#ifdef CONFIG_HOTPLUG_CPU
+int timers_dead_cpu(unsigned int cpu);
+#else
+#define timers_dead_cpu NULL
+#endif
+
#endif