linux-kernel - [tip: smp/core] smp: Don't wait for remote work done if not needed in smp_call_function_many

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <175097494304.406.14949887144517202475.tip-bot2@tip-bot2>
Date: Thu, 26 Jun 2025 21:55:43 -0000
From: "tip-bot2 for Yury Norov [NVIDIA]" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Yury Norov [NVIDIA]" <yury.norov@...il.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: smp/core] smp: Don't wait for remote work done if not needed in
 smp_call_function_many_cond()

The following commit has been merged into the smp/core branch of tip:

Commit-ID:     a12a498a9738db65152203467820bb15b6102bd2
Gitweb:        https://git.kernel.org/tip/a12a498a9738db65152203467820bb15b6102bd2
Author:        Yury Norov [NVIDIA] <yury.norov@...il.com>
AuthorDate:    Sun, 22 Jun 2025 20:00:08 -04:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 26 Jun 2025 23:46:35 +02:00

smp: Don't wait for remote work done if not needed in smp_call_function_many_cond()

If there are no IPIs sent, then there is no need to wait for a job
completion of non existant remote execution.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/all/20250623000010.10124-4-yury.norov@gmail.com

---
 kernel/smp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/smp.c b/kernel/smp.c
index 5871acf..7151906 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) {