[tip:,x86/mm] smp: Micro-optimize smp_call_function_many_cond()
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Message ID 161467888606.20312.2057210831067843812.tip-bot2@tip-bot2
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Commit dd75cba56151cb3b9dc7eac0221c9b1967f6ddb5
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  • [tip:,x86/mm] smp: Micro-optimize smp_call_function_many_cond()
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tip-bot2 for Wei Yongjun March 2, 2021, 9:54 a.m. UTC
The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     dd75cba56151cb3b9dc7eac0221c9b1967f6ddb5
Gitweb:        https://git.kernel.org/tip/dd75cba56151cb3b9dc7eac0221c9b1967f6ddb5
Author:        Ingo Molnar <mingo@kernel.org>
AuthorDate:    Tue, 02 Mar 2021 08:02:43 +01:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 02 Mar 2021 09:09:59 +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@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
diff mbox series

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);
 	}