Re: [PATCH] arm64: perf: Fix 64-bit event counter read truncation
From: Will Deacon <will@kernel.org>
Date: 2021-03-10 11:41:21
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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
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