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@xxxxxxxxxxxxx> AuthorDate: Tue, 02 Mar 2021 08:02:43 +01:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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@xxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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); }
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