smp: Don't wait for remote work done if not needed in smp_call_function_many_cond()

YuryNorov · KAGA-KOKO · commit a12a498a9738 · 2025-06-26T23:46:35.000+02:00
If there are no IPIs sent, then there is no need to wait for a job completion of non existant remote execution. Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250623000010.10124-4-yury.norov@gmail.com
diff --git a/kernel/smp.c b/kernel/smp.c
@@ -849,6 +849,8 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
 			send_call_function_single_ipi(last_cpu);
 		else if (likely(nr_cpus > 1))
 			send_call_function_ipi_mask(cfd->cpumask_ipi);
+		else
+			run_remote = false;
 	}
 
 	if (run_local) {

Original file line number	Diff line number	Diff line change
`@@ -849,6 +849,8 @@ static void smp_call_function_many_cond(const struct cpumask *mask,`
`849`	`849`	`send_call_function_single_ipi(last_cpu);`
`850`	`850`	`else if (likely(nr_cpus > 1))`
`851`	`851`	`send_call_function_ipi_mask(cfd->cpumask_ipi);`
	`852`	`+ else`
	`853`	`+ run_remote = false;`
`852`	`854`	`}`
`853`	`855`
`854`	`856`	`if (run_local) {`