linux-kernel - Re: [PATCH 1/2] arm_pmu: fix event CPU filtering

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Date:   Thu, 16 Feb 2023 15:13:11 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Janne Grunau <j@...nau.net>, will@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, asahi@...ts.linux.dev,
        ecurtin@...hat.com, lina@...hilina.net,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        ravi.bangoria@....com
Subject: Re: [PATCH 1/2] arm_pmu: fix event CPU filtering

On Thu, Feb 16, 2023 at 03:35:19PM +0100, Janne Grunau wrote:
> On 2023-02-16 14:12:38 +0000, Mark Rutland wrote:
> > Fix the CPU filtering by performing this consistently in
> > armpmu_filter(), and remove the redundant arm_pmu::filter() callback and
> > armv8pmu_filter() implementation.
> > 
> > Commit bd2756811766 also silently removed the CHAIN event filtering from
> > armv8pmu_filter(), which will be addressed by a separate patch without
> > using the filter callback.

[...]

> This works as well. I limited the patch to the minimal fix this                                                   
> this late in the cycle.

I did appreciate that you'd made the effort for the minimal fix; had the issue
with CHAIN events not existed I would have acked that as-is and done the
simplification later. Given the CHAIN issue and given the simplification make
the code "obviously correct" I think it's preferable to do both bits now.

> Tested-by: Janne Grunau <j@...nau.net>

Thanks!

Hopefully Will or Peter can pick this up shortly; I'm assuming that Will can
take this via the arm64 tree.

Mark.