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Message-ID: <tip-05ba3de74a3f499dcaa37b186220aaf174c95a4b@git.kernel.org> Date: Thu, 14 Sep 2017 03:45:05 -0700 From: tip-bot for Thomas Gleixner <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: peterz@...radead.org, cmetcalf@...lanox.com, linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de, bigeasy@...utronix.de, mingo@...nel.org, hpa@...or.com, dzickus@...hat.com, akpm@...ux-foundation.org, npiggin@...il.com, uobergfe@...hat.com, torvalds@...ux-foundation.org Subject: [tip:core/urgent] watchdog/core: Split out cpumask write function Commit-ID: 05ba3de74a3f499dcaa37b186220aaf174c95a4b Gitweb: http://git.kernel.org/tip/05ba3de74a3f499dcaa37b186220aaf174c95a4b Author: Thomas Gleixner <tglx@...utronix.de> AuthorDate: Tue, 12 Sep 2017 21:37:08 +0200 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Thu, 14 Sep 2017 11:41:06 +0200 watchdog/core: Split out cpumask write function Split the write part of the cpumask proc handler out into a separate helper to avoid deep indentation. This also reduces the patch complexity in the following cleanups. Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Reviewed-by: Don Zickus <dzickus@...hat.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Borislav Petkov <bp@...en8.de> Cc: Chris Metcalf <cmetcalf@...lanox.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Nicholas Piggin <npiggin@...il.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Sebastian Siewior <bigeasy@...utronix.de> Cc: Ulrich Obergfell <uobergfe@...hat.com> Link: http://lkml.kernel.org/r/20170912194147.218075991@linutronix.de Signed-off-by: Ingo Molnar <mingo@...nel.org> --- kernel/watchdog.c | 40 +++++++++++++++++++++------------------- 1 file changed, 21 insertions(+), 19 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index a9bdfde..cedf45a 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -792,10 +792,29 @@ static int watchdog_update_cpus(void) if (IS_ENABLED(CONFIG_SOFTLOCKUP_DETECTOR)) { return smpboot_update_cpumask_percpu_thread(&watchdog_threads, &watchdog_cpumask); + __lockup_detector_cleanup(); } return 0; } +static void proc_watchdog_cpumask_update(void) +{ + /* Remove impossible cpus to keep sysctl output clean. */ + cpumask_and(&watchdog_cpumask, &watchdog_cpumask, cpu_possible_mask); + + if (watchdog_running) { + /* + * Failure would be due to being unable to allocate a + * temporary cpumask, so we are likely not in a position to + * do much else to make things better. + */ + if (watchdog_update_cpus() != 0) + pr_err("cpumask update failed\n"); + } + + watchdog_nmi_reconfigure(); +} + /* * The cpumask is the mask of possible cpus that the watchdog can run * on, not the mask of cpus it is actually running on. This allows the @@ -811,30 +830,13 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write, mutex_lock(&watchdog_mutex); err = proc_do_large_bitmap(table, write, buffer, lenp, ppos); - if (!err && write) { - /* Remove impossible cpus to keep sysctl output cleaner. */ - cpumask_and(&watchdog_cpumask, &watchdog_cpumask, - cpu_possible_mask); - - if (watchdog_running) { - /* - * Failure would be due to being unable to allocate - * a temporary cpumask, so we are likely not in a - * position to do much else to make things better. - */ - if (watchdog_update_cpus() != 0) - pr_err("cpumask update failed\n"); - } - - watchdog_nmi_reconfigure(); - __lockup_detector_cleanup(); - } + if (!err && write) + proc_watchdog_cpumask_update(); mutex_unlock(&watchdog_mutex); cpu_hotplug_enable(); return err; } - #endif /* CONFIG_SYSCTL */ void __init lockup_detector_init(void)
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