linux-kernel - Re: [PATCH] arm64: perf: Fix 64-bit event counter read truncation

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Date:   Wed, 10 Mar 2021 11:39:19 +0000
From:   Will Deacon <will@...nel.org>
To:     Rob Herring <robh@...nel.org>, Mark Rutland <mark.rutland@....com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-arm-kernel@...ts.infradead.org,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Alexandru Elisei <alexandru.elisei@....com>
Subject: Re: [PATCH] arm64: perf: Fix 64-bit event counter read truncation

On Tue, 9 Mar 2021 17:44:12 -0700, Rob Herring wrote:
> Commit 0fdf1bb75953 ("arm64: perf: Avoid PMXEV* indirection") changed
> armv8pmu_read_evcntr() to return a u32 instead of u64. The result is
> silent truncation of the event counter when using 64-bit counters. Given
> the offending commit appears to have passed thru several folks, it seems
> likely this was a bad rebase after v8.5 PMU 64-bit counters landed.

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: perf: Fix 64-bit event counter read truncation
      https://git.kernel.org/arm64/c/7bb8bc6eb550

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev