From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751485AbbHAMqW (ORCPT ); Sat, 1 Aug 2015 08:46:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34401 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751180AbbHAMqT (ORCPT ); Sat, 1 Aug 2015 08:46:19 -0400 From: Ulrich Obergfell To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, dzickus@redhat.com, atomlin@redhat.com, uobergfe@redhat.com, jolsa@kernel.org, mhocko@suse.cz, eranian@google.com, cmetcalf@ezchip.com, fweisbec@gmail.com Subject: [PATCH 1/4] watchdog: introduce watchdog_park_threads() and watchdog_unpark_threads() Date: Sat, 1 Aug 2015 14:49:22 +0200 Message-Id: <1438433365-2979-2-git-send-email-uobergfe@redhat.com> In-Reply-To: <1438433365-2979-1-git-send-email-uobergfe@redhat.com> References: <1438433365-2979-1-git-send-email-uobergfe@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These functions are intended to be used only from inside kernel/watchdog.c to park/unpark all watchdog threads that are specified in watchdog_cpumask. Signed-off-by: Ulrich Obergfell --- kernel/watchdog.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index a6ffa43..5571f20 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -24,6 +24,7 @@ #include #include #include +#include /* * The run state of the lockup detectors is controlled by the content of the @@ -666,6 +667,41 @@ static struct smp_hotplug_thread watchdog_threads = { .unpark = watchdog_enable, }; +/* + * park all watchdog threads that are specified in 'watchdog_cpumask' + */ +static int watchdog_park_threads(void) +{ + int cpu, ret = 0; + + get_online_cpus(); + for_each_watchdog_cpu(cpu) { + ret = kthread_park(per_cpu(softlockup_watchdog, cpu)); + if (ret) + break; + } + if (ret) { + for_each_watchdog_cpu(cpu) + kthread_unpark(per_cpu(softlockup_watchdog, cpu)); + } + put_online_cpus(); + + return ret; +} + +/* + * unpark all watchdog threads that are specified in 'watchdog_cpumask' + */ +static void watchdog_unpark_threads(void) +{ + int cpu; + + get_online_cpus(); + for_each_watchdog_cpu(cpu) + kthread_unpark(per_cpu(softlockup_watchdog, cpu)); + put_online_cpus(); +} + static void restart_watchdog_hrtimer(void *info) { struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); -- 1.7.11.7