linux-kernel - Re: [PATCH] perf/arm-cmn: Fix DTC reset

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Date:   Fri, 14 Apr 2023 13:42:40 +0100
From:   Will Deacon <will@...nel.org>
To:     Geoff Blake <blakgeof@...zon.com>
Cc:     Robin Murphy <robin.murphy@....com>, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ilkka@...amperecomputing.com
Subject: Re: [PATCH] perf/arm-cmn: Fix DTC reset

Hi Geoff,

On Thu, Apr 06, 2023 at 04:25:39PM -0500, Geoff Blake wrote:
> Ran this patch on an AWS C6g.metal and unfortunately still see the 
> spurious IRQs trigger quickly (within 10 tries) when using the following 
> flow:
> 
> perf stat -a -e arm_cmn_0/event=0x5,type=0x5/ -- sleep 600
> kexec -e 
> 
> Adding in the simple shutdown routine, I have run over 100 of the 
> above cycles and the spurious IRQs haven't triggered.  I think we still 
> need both for now.

Does that mean you're happy for me to queue this change as-is?

Will