diff options
| author | Kan Liang <kan.liang@intel.com> | 2018-05-03 11:25:08 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 07:55:15 +0200 |
| commit | 47fc151cbdbe7671e9124d18245e890374509da2 (patch) | |
| tree | 3e52c1def1ade0ee285f9ee9fd15b1ea15fc8d5b /arch | |
| parent | ce28cf5fb47f149e30176b7d6de161ebf1c6c6a1 (diff) | |
perf/x86/intel/uncore: Correct fixed counter index check in generic code
[ Upstream commit 4749f8196452eeb73cf2086a6a9705bae479d33d ]
There is no index which is bigger than UNCORE_PMC_IDX_FIXED. The only
exception is client IMC uncore, which has been specially handled.
For generic code, it is not correct to use >= to check fixed counter.
The code quality issue will bring problem when a new counter index is
introduced.
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: acme@kernel.org
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1525371913-10597-3-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/events/intel/uncore.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c index aec6cc925af8..4f365267b12f 100644 --- a/arch/x86/events/intel/uncore.c +++ b/arch/x86/events/intel/uncore.c @@ -212,7 +212,7 @@ void uncore_perf_event_update(struct intel_uncore_box *box, struct perf_event *e u64 prev_count, new_count, delta; int shift; - if (event->hw.idx >= UNCORE_PMC_IDX_FIXED) + if (event->hw.idx == UNCORE_PMC_IDX_FIXED) shift = 64 - uncore_fixed_ctr_bits(box); else shift = 64 - uncore_perf_ctr_bits(box); |