linux-kernel - [PATCH 1/4] sched/smt: Introduce sched_smt_present

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Message-Id: <20240703031610.587047-2-yangyingliang@huaweicloud.com>
Date: Wed,  3 Jul 2024 11:16:07 +0800
From: Yang Yingliang <yangyingliang@...weicloud.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	bristot@...hat.com,
	vschneid@...hat.com,
	tglx@...utronix.de,
	yu.c.chen@...el.com,
	tim.c.chen@...ux.intel.com,
	yangyingliang@...wei.com,
	liwei391@...wei.com
Subject: [PATCH 1/4] sched/smt: Introduce sched_smt_present_inc/dec() helper

From: Yang Yingliang <yangyingliang@...wei.com>

Introduce sched_smt_present_inc/dec() helper, so it can be called
in normal or error path simply. No functional changed.

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 kernel/sched/core.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index bcf2c4cc0522..880c4c03ef8a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9654,6 +9654,22 @@ static int cpuset_cpu_inactive(unsigned int cpu)
 	return 0;
 }
 
+static inline void sched_smt_present_inc(int cpu)
+{
+#ifdef CONFIG_SCHED_SMT
+	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+		static_branch_inc_cpuslocked(&sched_smt_present);
+#endif
+}
+
+static inline void sched_smt_present_dec(int cpu)
+{
+#ifdef CONFIG_SCHED_SMT
+	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+		static_branch_dec_cpuslocked(&sched_smt_present);
+#endif
+}
+
 int sched_cpu_activate(unsigned int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
@@ -9665,13 +9681,10 @@ int sched_cpu_activate(unsigned int cpu)
 	 */
 	balance_push_set(cpu, false);
 
-#ifdef CONFIG_SCHED_SMT
 	/*
 	 * When going up, increment the number of cores with SMT present.
 	 */
-	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
-		static_branch_inc_cpuslocked(&sched_smt_present);
-#endif
+	sched_smt_present_inc(cpu);
 	set_cpu_active(cpu, true);
 
 	if (sched_smp_initialized) {
@@ -9740,13 +9753,12 @@ int sched_cpu_deactivate(unsigned int cpu)
 	}
 	rq_unlock_irqrestore(rq, &rf);
 
-#ifdef CONFIG_SCHED_SMT
 	/*
 	 * When going down, decrement the number of cores with SMT present.
 	 */
-	if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
-		static_branch_dec_cpuslocked(&sched_smt_present);
+	sched_smt_present_dec(cpu);
 
+#ifdef CONFIG_SCHED_SMT
 	sched_core_cpu_deactivate(cpu);
 #endif
 
-- 
2.25.1