linux-kernel - [tip: x86/mm] smp: Micro-optimize smp_call_function_many

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Message-ID: <161503277342.398.3827662830739276370.tip-bot2@tip-bot2>
Date:   Sat, 06 Mar 2021 12:12:53 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: [tip: x86/mm] smp: Micro-optimize smp_call_function_many_cond()

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     d43f17a1da25373580ebb466de7d0641acbf6fd6
Gitweb:        https://git.kernel.org/tip/d43f17a1da25373580ebb466de7d0641acbf6fd6
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 02 Mar 2021 08:02:43 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sat, 06 Mar 2021 13:00:22 +01:00

smp: Micro-optimize smp_call_function_many_cond()

Call the generic send_call_function_single_ipi() function, which
will avoid the IPI when @last_cpu is idle.

Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index b6375d7..af0d51d 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -694,7 +694,7 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
 		 * provided mask.
 		 */
 		if (nr_cpus == 1)
-			arch_send_call_function_single_ipi(last_cpu);
+			send_call_function_single_ipi(last_cpu);
 		else if (likely(nr_cpus > 1))
 			arch_send_call_function_ipi_mask(cfd->cpumask_ipi);
 	}