linux-kernel - [tip: smp/core] smp: Defer check for local execution in smp_call_function_many

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Message-ID: <175147701995.406.2190759503320187064.tip-bot2@tip-bot2>
Date: Wed, 02 Jul 2025 17:23:39 -0000
From: "tip-bot2 for Yury Norov [NVIDIA]" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Yury Norov [NVIDIA]" <yury.norov@...il.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: smp/core] smp: Defer check for local execution in
 smp_call_function_many_cond()

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

Commit-ID:     e0e9506523fea415e0d5abaa103fd67dc8a39696
Gitweb:        https://git.kernel.org/tip/e0e9506523fea415e0d5abaa103fd67dc8a39696
Author:        Yury Norov [NVIDIA] <yury.norov@...il.com>
AuthorDate:    Sun, 22 Jun 2025 20:00:09 -04:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 02 Jul 2025 19:13:14 +02:00

smp: Defer check for local execution in smp_call_function_many_cond()

Defer check for local execution to the actual place where it is needed,
which removes the extra local variable.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/all/20250623000010.10124-5-yury.norov@gmail.com

---
 kernel/smp.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 5871acf..99d1fd0 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -779,7 +779,6 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
 	bool wait = scf_flags & SCF_WAIT;
 	int nr_cpus = 0;
 	bool run_remote = false;
-	bool run_local = false;
 
 	lockdep_assert_preemption_disabled();
 
@@ -801,11 +800,6 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
 	 */
 	WARN_ON_ONCE(!in_task());
 
-	/* Check if we need local execution. */
-	if ((scf_flags & SCF_RUN_LOCAL) && cpumask_test_cpu(this_cpu, mask) &&
-	    (!cond_func || cond_func(this_cpu, info)))
-		run_local = true;
-
 	/* Check if we need remote execution, i.e., any CPU excluding this one. */
 	if (cpumask_any_and_but(mask, cpu_online_mask, this_cpu) < nr_cpu_ids) {
 		run_remote = true;
@@ -851,7 +845,9 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
 			send_call_function_ipi_mask(cfd->cpumask_ipi);
 	}
 
-	if (run_local) {
+	/* Check if we need local execution. */
+	if ((scf_flags & SCF_RUN_LOCAL) && cpumask_test_cpu(this_cpu, mask) &&
+	    (!cond_func || cond_func(this_cpu, info))) {
 		unsigned long flags;
 
 		local_irq_save(flags);