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Message-ID: <20141007195108.GB28002@redhat.com> Date: Tue, 7 Oct 2014 21:51:08 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org Subject: [PATCH 1/1] sched: fix the PREEMPT_ACTIVE check in __trace_sched_switch_state() task_preempt_count() has nothing to do with the actual preempt counter, thread_info->saved_preempt_count is only valid right after switch_to(). __trace_sched_switch_state() can use preempt_count(), prev is still the current task when trace_sched_switch() is called. Signed-off-by: Oleg Nesterov <oleg@...hat.com> --- include/trace/events/sched.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 0a68d5a..a7d67bc 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -100,7 +100,7 @@ static inline long __trace_sched_switch_state(struct task_struct *p) /* * For all intents and purposes a preempted task is a running task. */ - if (task_preempt_count(p) & PREEMPT_ACTIVE) + if (preempt_count() & PREEMPT_ACTIVE) state = TASK_RUNNING | TASK_STATE_MAX; #endif -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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