Use local64_try_cmpxchg instead of local64_cmpxchg (*ptr, old, new) == old
in i915_pmu_event_read.  x86 CMPXCHG instruction returns success in ZF flag,
so this change saves a compare after cmpxchg (and related move instruction
in front of cmpxchg).

Also, try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg
fails. There is no need to re-read the value in the loop.

No functional change intended.

Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Cc: David Airlie <airl...@gmail.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Signed-off-by: Uros Bizjak <ubiz...@gmail.com>
---
 drivers/gpu/drm/i915/i915_pmu.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index d35973b41186..108b675088ba 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -696,12 +696,11 @@ static void i915_pmu_event_read(struct perf_event *event)
                event->hw.state = PERF_HES_STOPPED;
                return;
        }
-again:
-       prev = local64_read(&hwc->prev_count);
-       new = __i915_pmu_event_read(event);
 
-       if (local64_cmpxchg(&hwc->prev_count, prev, new) != prev)
-               goto again;
+       prev = local64_read(&hwc->prev_count);
+       do {
+               new = __i915_pmu_event_read(event);
+       } while (!local64_try_cmpxchg(&hwc->prev_count, &prev, new));
 
        local64_add(new - prev, &event->count);
 }
-- 
2.41.0

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