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Date: Thu, 22 Sep 2016 04:58:39 -0700 From: tip-bot for Con Kolivas <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: tglx@...utronix.de, linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...or.com, peterz@...radead.org, kernel@...ivas.org, cchalpha@...il.com Subject: [tip:sched/core] sched/core: Do not use smp_processor_id() with preempt enabled in smpboot_thread_fn() Commit-ID: 4fa5cd5245b627db88c9ca08ae442373b02596b4 Gitweb: http://git.kernel.org/tip/4fa5cd5245b627db88c9ca08ae442373b02596b4 Author: Con Kolivas <kernel@...ivas.org> AuthorDate: Tue, 13 Sep 2016 16:27:05 +1000 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Thu, 22 Sep 2016 12:28:00 +0200 sched/core: Do not use smp_processor_id() with preempt enabled in smpboot_thread_fn() We should not be using smp_processor_id() with preempt enabled. Bug identified and fix provided by Alfred Chen. Reported-by: Alfred Chen <cchalpha@...il.com> Signed-off-by: Con Kolivas <kernel@...ivas.org> Cc: Alfred Chen <cchalpha@...il.com> Cc: Peter Zijlstra <peterz@...radead.org> Link: http://lkml.kernel.org/r/2042051.3vvUWIM0vs@hex Signed-off-by: Ingo Molnar <mingo@...nel.org> --- kernel/smpboot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/smpboot.c b/kernel/smpboot.c index 13bc43d..fc0d8270 100644 --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -122,12 +122,12 @@ static int smpboot_thread_fn(void *data) if (kthread_should_park()) { __set_current_state(TASK_RUNNING); - preempt_enable(); if (ht->park && td->status == HP_THREAD_ACTIVE) { BUG_ON(td->cpu != smp_processor_id()); ht->park(td->cpu); td->status = HP_THREAD_PARKED; } + preempt_enable(); kthread_parkme(); /* We might have been woken for stop */ continue;
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