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From:   Yury Norov <yury.norov@gmail.com>
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Subject: [PATCH 41/54] arch/x86: replace cpumask_weight with cpumask_weight_eq where appropriate
Date:   Sun, 23 Jan 2022 10:39:12 -0800
Message-Id: <20220123183925.1052919-42-yury.norov@gmail.com>
In-Reply-To: <20220123183925.1052919-1-yury.norov@gmail.com>
References: <20220123183925.1052919-1-yury.norov@gmail.com>
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smpboot code in somw places 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 met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 arch/x86/kernel/smpboot.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 617012f4619f..e851e9945eb5 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1608,7 +1608,7 @@ static void remove_siblinginfo(int cpu)
 		/*/
 		 * last thread sibling in this cpu core going down
 		 */
-		if (cpumask_weight(topology_sibling_cpumask(cpu)) == 1)
+		if (cpumask_weight_eq(topology_sibling_cpumask(cpu), 1))
 			cpu_data(sibling).booted_cores--;
 	}
 
@@ -1617,7 +1617,7 @@ static void remove_siblinginfo(int cpu)
 
 	for_each_cpu(sibling, topology_sibling_cpumask(cpu)) {
 		cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
-		if (cpumask_weight(topology_sibling_cpumask(sibling)) == 1)
+		if (cpumask_weight_eq(topology_sibling_cpumask(sibling), 1))
 			cpu_data(sibling).smt_active = false;
 	}
 
-- 
2.30.2