From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25BDDC43381 for ; Sat, 6 Mar 2021 12:14:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D879F64FE8 for ; Sat, 6 Mar 2021 12:14:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231239AbhCFMN1 (ORCPT ); Sat, 6 Mar 2021 07:13:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231133AbhCFMMz (ORCPT ); Sat, 6 Mar 2021 07:12:55 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 881E5C06174A; Sat, 6 Mar 2021 04:12:55 -0800 (PST) Date: Sat, 06 Mar 2021 12:12:53 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1615032774; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=48kPM0f79vSXe1drsieCmgoNMep3siPJdaGAOREFhMQ=; b=KSP9sC1dfn7lBUP4oFmuk4cS+P4Nk+QA2HXAcUf48f/4nfqzjkDw7ycdLfSZ9H1mhgke2E riXYnl4keXCpZTlGaHuHqlFPWXyqxxuiXU+KEOlSoWWLF7lQ8BmQ53GyZ8fLyA9t8RvR/a unjNc4vnSnKFhiQ+8tzGm9dA1IDBm0wEwuHjtfyVx3WbMSkUKSBXs1VIra5wSiBlaH9bf2 LHtciU13Jhk3vKysG0IZxNtUwoXLsVSekNp957R3xo480OuCSV8xdEQJvjsJb92xH5QnFa cK/QWH2jdZA9hphAmmhDJIcHqW3nUT4uHMAq1OsQhKvpo0CcJw6nhh/3MZ8Itg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1615032774; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=48kPM0f79vSXe1drsieCmgoNMep3siPJdaGAOREFhMQ=; b=Y2wAMcQXZ3T6fabjBIxQh99b2I3CbZSIqY4enoalfSPkHKoahqUGx6n88thbmaDzQaqZew GcMF6PgeXyRy/+AA== From: "tip-bot2 for Peter Zijlstra" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/mm] smp: Micro-optimize smp_call_function_many_cond() Cc: Peter Zijlstra , Ingo Molnar , linux-kernel@vger.kernel.org, x86@kernel.org MIME-Version: 1.0 Message-ID: <161503277342.398.3827662830739276370.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 AuthorDate: Tue, 02 Mar 2021 08:02:43 +01:00 Committer: Ingo Molnar 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 Signed-off-by: Ingo Molnar Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- 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); }