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Date: Mon, 3 Apr 2023 23:05:17 -0700 (PDT)
From: Ilkka Koskinen <ilkka@...amperecomputing.com>
To: Robin Murphy <robin.murphy@....com>
cc: will@...nel.org, mark.rutland@....com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf/arm-cmn: Validate cycles events fully
On Mon, 3 Apr 2023, Robin Murphy wrote:
> DTC cycle count events don't have anything to validate or initialise in
> themselves, but we should not forget to still validate their whole group
> context. Otherwise, we may fail to correctly reject a contrived group
> containing an impossible number of cycles events.
>
> Signed-off-by: Robin Murphy <robin.murphy@....com>
Looks good to me and works as expected.
Cheers, Ilkka
> ---
> drivers/perf/arm-cmn.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
> index 367d41c5d983..45819528facb 100644
> --- a/drivers/perf/arm-cmn.c
> +++ b/drivers/perf/arm-cmn.c
> @@ -1558,7 +1558,7 @@ static int arm_cmn_event_init(struct perf_event *event)
> type = CMN_EVENT_TYPE(event);
> /* DTC events (i.e. cycles) already have everything they need */
> if (type == CMN_TYPE_DTC)
> - return 0;
> + return arm_cmn_validate_group(cmn, event);
>
> eventid = CMN_EVENT_EVENTID(event);
> /* For watchpoints we need the actual XP node here */
> --
> 2.39.2.101.g768bb238c484.dirty
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
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