linux-kernel - [tip: sched/core] sched/smt: Introduce sched_smt_present

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <172224924995.2215.9546634232496925582.tip-bot2@tip-bot2>
Date: Mon, 29 Jul 2024 10:34:09 -0000
From: "tip-bot2 for Yang Yingliang" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: stable@...nel.org, Yang Yingliang <yangyingliang@...wei.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: sched/core] sched/smt: Introduce sched_smt_present_inc/dec() helper

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     31b164e2e4af84d08d2498083676e7eeaa102493
Gitweb:        https://git.kernel.org/tip/31b164e2e4af84d08d2498083676e7eeaa102493
Author:        Yang Yingliang <yangyingliang@...wei.com>
AuthorDate:    Wed, 03 Jul 2024 11:16:07 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 29 Jul 2024 12:22:32 +02:00

sched/smt: Introduce sched_smt_present_inc/dec() helper

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

Cc: stable@...nel.org
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20240703031610.587047-2-yangyingliang@huaweicloud.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 a9f6550..acc04ed 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7895,6 +7895,22 @@ 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);
@@ -7906,13 +7922,10 @@ 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) {
@@ -7981,13 +7994,12 @@ 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