[tip: x86/mm] smp: Micro-optimize smp_call_function_many_cond()

[tip-bot2 for Ingo Molnar]

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 <mi...@kernel.org>
AuthorDate:    Tue, 02 Mar 2021 08:02:43 +01:00
Committer:     Ingo Molnar <mi...@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 <pet...@infradead.org>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mi...@kernel.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);
        }