arm64: perf: Fix 64-bit event counter read truncation
Commit 0fdf1bb7 ("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. Cc: Alexandru Elisei <alexandru.elisei@arm.com> Cc: Julien Thierry <julien.thierry.kdev@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: <stable@vger.kernel.org> Fixes: 0fdf1bb7 ("arm64: perf: Avoid PMXEV* indirection") Signed-off-by:Rob Herring <robh@kernel.org> Acked-by:
Mark Rutland <mark.rutland@arm.com> Reviewed-by:
Alexandru Elisei <alexandru.elisei@arm.com> Link: https://lore.kernel.org/r/20210310004412.1450128-1-robh@kernel.org Signed-off-by:
Will Deacon <will@kernel.org>
parent
26f55386
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