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sched/fair: Drop useless cpumask_empty() in find_energy_efficient_cpu()

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cpumask_empty() call is O(N) and useless because the previous
cpumask_and() returns false for empty 'cpus'. Drop it.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://patch.msgid.link/20251207040543.407695-1-yury.norov@gmail.com
This commit is contained in:
Yury Norov (NVIDIA) 2025-12-06 23:05:42 -05:00 committed by Peter Zijlstra
parent 6ab7973f25
commit ff1de90dd7
1 changed files with 1 additions and 3 deletions
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4
kernel/sched/fair.c
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@ -8359,9 +8359,7 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
int max_spare_cap_cpu = -1;
int fits, max_fits = -1;
cpumask_and(cpus, perf_domain_span(pd), cpu_online_mask);
if (cpumask_empty(cpus))
if (!cpumask_and(cpus, perf_domain_span(pd), cpu_online_mask))
continue;
/* Account external pressure for the energy estimation */