From 93d9132528e99dfdccb1e823dc94cc9293a3a31c Mon Sep 17 00:00:00 2001
From: Yury Norov <yury.norov@gmail.com>
Date: Sun, 23 Jan 2022 10:38:48 -0800
Subject: drm/i915/pmu: replace cpumask_weight with cpumask_empty where
appropriate
Git-commit: a37e94fe7c428ff4663f22966e142e7610ed049d
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
i915_pmu_cpu_online() calls cpumask_weight() to check if any bit of a
given cpumask is set. We can do it more efficiently with cpumask_empty()
because cpumask_empty() stops traversing the cpumask as soon as it finds
first set bit, while cpumask_weight() counts all bits unconditionally.
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/i915_pmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 3e3b09588fd3..958b37123bf1 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -1047,7 +1047,7 @@ static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
GEM_BUG_ON(!pmu->base.event_init);
/* Select the first online CPU as a designated reader. */
- if (!cpumask_weight(&i915_pmu_cpumask))
+ if (cpumask_empty(&i915_pmu_cpumask))
cpumask_set_cpu(cpu, &i915_pmu_cpumask);
return 0;
--
2.38.1