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

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Date:   Mon, 5 Sep 2016 04:53:07 -0700
From:   tip-bot for Will Deacon <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, will.deacon@....com, eranian@...gle.com,
        hpa@...or.com, tglx@...utronix.de, peterz@...radead.org,
        torvalds@...ux-foundation.org, jolsa@...hat.com, mingo@...nel.org,
        vincent.weaver@...ne.edu, alexander.shishkin@...ux.intel.com,
        linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf/core: Don't pass PERF_EF_START to the PMU
 ->start callback

Commit-ID:  c9bbdd4830ab06288bb1d8c00ed8c8c6e80e377a
Gitweb:     http://git.kernel.org/tip/c9bbdd4830ab06288bb1d8c00ed8c8c6e80e377a
Author:     Will Deacon <will.deacon@....com>
AuthorDate: Mon, 15 Aug 2016 11:42:45 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 5 Sep 2016 13:19:18 +0200

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.

Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: mark.rutland@....com
Link: http://lkml.kernel.org/r/1471257765-29662-1-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 dff00c7..74f22a9 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2492,7 +2492,7 @@ 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;
 }