linux-kernel - [PATCH v2 3/4] smp: Don't wait for remote work done if not needed in smp_call_function_many

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Message-ID: <20250623000010.10124-4-yury.norov@gmail.com>
Date: Sun, 22 Jun 2025 20:00:08 -0400
From: Yury Norov <yury.norov@...il.com>
To: "Paul E. McKenney" <paulmck@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	"Yury Norov [NVIDIA]" <yury.norov@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thorsten Blum <thorsten.blum@...ux.dev>,
	Zqiang <qiang.zhang1211@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] smp: Don't wait for remote work done if not needed in smp_call_function_many_cond()

From: "Yury Norov [NVIDIA]" <yury.norov@...il.com>

If we don't actually send any IPIs, there's no need to wait for a job
completion.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
---
 kernel/smp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/smp.c b/kernel/smp.c
index 5871acf3cd45..715190669e94 100644
--- 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) {
-- 
2.43.0