linux-kernel - [PATCH] perf/core: Don't pass PERF_EF

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Date:	Mon, 15 Aug 2016 11:42:45 +0100
From:	Will Deacon <will.deacon@....com>
To:	linux-kernel@...r.kernel.org
Cc:	mark.rutland@....com, Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] perf/core: Don't pass PERF_EF_START to the PMU ->start callback

PERF_EF_START is a flag to indicate to the PMU ->add callback that, as
well as claiming the PMU resources required by the event being added,
it should also start the PMU.

Passing this flag to the ->start callback doesn't make sense, because
->start always tries to start the PMU. Remove it.

Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 kernel/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 1903b8f3a705..b11504376af7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2455,7 +2455,7 @@ static int __perf_event_stop(void *info)
 	 * while restarting.
 	 */
 	if (sd->restart)
-		event->pmu->start(event, PERF_EF_START);
+		event->pmu->start(event, 0);
 
 	return 0;
 }
-- 
2.1.4