From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
From: Rob Herring <r...@kernel.org>
commit 7bb8bc6eb550116c504fb25af8678b9d7ca2abc5 upstream.
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.
Cc: Alexandru Elisei <alexandru.eli...@arm.com>
Cc: Julien Thierry <julien.thierry.k...@gmail.com>
Cc: Mark Rutland <mark.rutl...@arm.com>
Cc: Will Deacon <w...@kernel.org>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: <sta...@vger.kernel.org>
Fixes: 0fdf1bb75953 ("arm64: perf: Avoid PMXEV* indirection")
Signed-off-by: Rob Herring <r...@kernel.org>
Acked-by: Mark Rutland <mark.rutl...@arm.com>
Reviewed-by: Alexandru Elisei <alexandru.eli...@arm.com>
Link: https://lore.kernel.org/r/20210310004412.1450128-1-r...@kernel.org
Signed-off-by: Will Deacon <w...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/arm64/kernel/perf_event.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -460,7 +460,7 @@ static inline int armv8pmu_counter_has_o
return pmnc & BIT(ARMV8_IDX_TO_COUNTER(idx));
}
-static inline u32 armv8pmu_read_evcntr(int idx)
+static inline u64 armv8pmu_read_evcntr(int idx)
{
u32 counter = ARMV8_IDX_TO_COUNTER(idx);
