linux-kernel - Re: [PATCH 1/3] perf: Remove duplicate invocation on perf_event_for

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Date:	Thu, 31 May 2012 19:00:00 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Namhyung Kim <namhyung.kim@....com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] perf: Remove duplicate invocation on
 perf_event_for_each

On Thu, 2012-05-31 at 14:51 +0900, Namhyung Kim wrote:
> The @func callback was invoked twice for group leader
> when perf_event_for_each() called. It seems the commit
> 75f937f24bd9 ("perf_counter: Fix ctx->mutex vs counter
> ->mutex inversion") made the mistake during the change.
> 
> Signed-off-by: Namhyung Kim <namhyung.kim@....com>

Good spotting, thanks!

> ---
>  kernel/events/core.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 5b06cbbf6931..f85c0154b333 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -3181,7 +3181,6 @@ static void perf_event_for_each(struct perf_event *event,
>  	event = event->group_leader;
>  
>  	perf_event_for_each_child(event, func);
> -	func(event);
>  	list_for_each_entry(sibling, &event->sibling_list, group_entry)
>  		perf_event_for_each_child(sibling, func);
>  	mutex_unlock(&ctx->mutex);

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