linux-kernel - Re: [PATCH] perf: Fix bad software/trace event recursion counting

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Date:	Tue, 24 Nov 2009 21:48:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] perf: Fix bad software/trace event recursion counting

On Tue, 2009-11-24 at 20:38 +0100, Frederic Weisbecker wrote:

> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index accfd7b..35df94e 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -3914,7 +3914,7 @@ void perf_swevent_put_recursion_context(int rctx)
>  {
>  	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
>  	barrier();
> -	cpuctx->recursion[rctx]++;
> +	cpuctx->recursion[rctx]--;
>  	put_cpu_var(perf_cpu_context);
>  }

D'0h!

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