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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 0FC30C432C0 for ; Mon, 25 Nov 2019 11:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E28FA20740 for ; Mon, 25 Nov 2019 11:28:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727692AbfKYL2H (ORCPT ); Mon, 25 Nov 2019 06:28:07 -0500 Received: from foss.arm.com ([217.140.110.172]:48894 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725851AbfKYL2H (ORCPT ); Mon, 25 Nov 2019 06:28:07 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A28971045; Mon, 25 Nov 2019 03:28:06 -0800 (PST) Received: from e107158-lin.cambridge.arm.com (e107158-lin.cambridge.arm.com [10.1.195.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1F7293F52E; Mon, 25 Nov 2019 03:28:04 -0800 (PST) From: Qais Yousef To: Thomas Gleixner , Greg Kroah-Hartman Cc: Qais Yousef , Josh Poimboeuf , "Peter Zijlstra (Intel)" , Jiri Kosina , Nicholas Piggin , Daniel Lezcano , Ingo Molnar , Eiichi Tsukata , Zhenzhong Duan , Nadav Amit , "Rafael J. Wysocki" , Tony Luck , Fenghua Yu , Russell King , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 01/14] smp: Create a new function to shutdown nonboot cpus Date: Mon, 25 Nov 2019 11:27:41 +0000 Message-Id: <20191125112754.25223-2-qais.yousef@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191125112754.25223-1-qais.yousef@arm.com> References: <20191125112754.25223-1-qais.yousef@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This function will be used later in machine_shutdown() for some archs. Signed-off-by: Qais Yousef CC: Thomas Gleixner CC: Josh Poimboeuf CC: "Peter Zijlstra (Intel)" CC: Jiri Kosina CC: Nicholas Piggin CC: Daniel Lezcano CC: Ingo Molnar CC: Eiichi Tsukata CC: Zhenzhong Duan CC: Nadav Amit CC: Greg Kroah-Hartman CC: "Rafael J. Wysocki" CC: Tony Luck CC: Fenghua Yu CC: Russell King CC: Catalin Marinas CC: Will Deacon CC: linux-arm-kernel@lists.infradead.org CC: linux-ia64@vger.kernel.org CC: linux-kernel@vger.kernel.org --- include/linux/cpu.h | 2 ++ kernel/cpu.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/cpu.h b/include/linux/cpu.h index bc6c879bd110..8229932fb053 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -118,6 +118,7 @@ extern void cpu_hotplug_disable(void); extern void cpu_hotplug_enable(void); void clear_tasks_mm_cpumask(int cpu); int cpu_down(unsigned int cpu); +extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu); #else /* CONFIG_HOTPLUG_CPU */ @@ -129,6 +130,7 @@ static inline int cpus_read_trylock(void) { return true; } static inline void lockdep_assert_cpus_held(void) { } static inline void cpu_hotplug_disable(void) { } static inline void cpu_hotplug_enable(void) { } +static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } #endif /* !CONFIG_HOTPLUG_CPU */ /* Wrappers which go away once all code is converted */ diff --git a/kernel/cpu.c b/kernel/cpu.c index e2cad3ee2ead..94055a0d989e 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1058,6 +1058,23 @@ int cpu_down(unsigned int cpu) } EXPORT_SYMBOL(cpu_down); +void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) +{ + unsigned int cpu; + + if (!cpu_online(primary_cpu)) { + pr_info("Attempting to shutdodwn nonboot cpus while boot cpu is offline!\n"); + cpu_online(primary_cpu); + } + + for_each_present_cpu(cpu) { + if (cpu == primary_cpu) + continue; + if (cpu_online(cpu)) + cpu_down(cpu); + } +} + #else #define takedown_cpu NULL #endif /*CONFIG_HOTPLUG_CPU*/ -- 2.17.1