linux-kernel - Re: [PATCH v2 3/5] MIPS/Perf-events: Fix event check in validate

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Date:	Fri, 26 Nov 2010 09:37:14 +0000
From:	Will Deacon <will.deacon@....com>
To:	Deng-Cheng Zhu <dengcheng.zhu@...il.com>
Cc:	ralf@...ux-mips.org, a.p.zijlstra@...llo.nl, fweisbec@...il.com,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	wuzhangjin@...il.com, paulus@...ba.org, mingo@...e.hu,
	acme@...hat.com
Subject: Re: [PATCH v2 3/5] MIPS/Perf-events: Fix event check in
 validate_event()

On Fri, 2010-11-26 at 03:05 +0000, Deng-Cheng Zhu wrote:
> Ignore events that are in off/error state or belong to a different PMU.
> 
> This patch originates from the following commit for ARM by Will Deacon:
> 
> 65b4711ff513767341aa1915c822de6ec0de65cb
>         ARM: 6352/1: perf: fix event validation
> 
> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@...il.com>
> ---
>  arch/mips/kernel/perf_event.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c
> index 1ee44a3..3d55761 100644
> --- a/arch/mips/kernel/perf_event.c
> +++ b/arch/mips/kernel/perf_event.c
> @@ -486,8 +486,9 @@ static int validate_event(struct cpu_hw_events *cpuc,
>  {
>         struct hw_perf_event fake_hwc = event->hw;
> 
> -       if (event->pmu && event->pmu != &pmu)
> -               return 0;
> +       /* Allow mixed event group. So return 1 to pass validation. */
> +       if (event->pmu != &pmu || event->state <= PERF_EVENT_STATE_OFF)
> +               return 1;
> 
>         return mipspmu->alloc_counter(cpuc, &fake_hwc) >= 0;
>  }


This looks better,

Acked-by: Will Deacon <will.deacon@....com>

Will


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