drm/i915/pmu: Use local64_try_cmpxchg in i915_pmu_event_read

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.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230703150859.6176-1-ubizjak@gmail.com

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);
 }