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From:   Yury Norov <yury.norov@gmail.com>
To:     Yury Norov <yury.norov@gmail.com>,
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Subject: [PATCH 39/49] arch/s390: replace cpumask_weight with cpumask_weight_eq where appropriate
Date:   Thu, 10 Feb 2022 14:49:23 -0800
Message-Id: <20220210224933.379149-40-yury.norov@gmail.com>
In-Reply-To: <20220210224933.379149-1-yury.norov@gmail.com>
References: <20220210224933.379149-1-yury.norov@gmail.com>
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cfset_all_start() calls cpumask_weight() to compare the weight of cpumask
with a given number. We can do it more efficiently with
cpumask_weight_{eq, ...} because conditional cpumask_weight may stop
traversing the cpumask earlier, as soon as condition is (or can't be) met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 arch/s390/kernel/perf_cpum_cf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index ee8707abdb6a..4d217f7f5ccf 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -975,7 +975,7 @@ static int cfset_all_start(struct cfset_request *req)
 		return -ENOMEM;
 	cpumask_and(mask, &req->mask, cpu_online_mask);
 	on_each_cpu_mask(mask, cfset_ioctl_on, &p, 1);
-	if (atomic_read(&p.cpus_ack) != cpumask_weight(mask)) {
+	if (!cpumask_weight_eq(mask, atomic_read(&p.cpus_ack))) {
 		on_each_cpu_mask(mask, cfset_ioctl_off, &p, 1);
 		rc = -EIO;
 		debug_sprintf_event(cf_dbg, 4, "%s CPUs missing", __func__);
-- 
2.32.0