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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-09-12 21:37:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-09-14 11:41:06 +0200 |
| commit | e8b62b2dd14f8f2427856ba24cb7db922bda9bfd (patch) | |
| tree | f08f6ca005a6342b6ca1051a418c1a969be72922 /kernel/watchdog.c | |
| parent | d57108d4f6791291e89d980e7f7a3566c32ab188 (diff) | |
| download | lwn-e8b62b2dd14f8f2427856ba24cb7db922bda9bfd.tar.gz lwn-e8b62b2dd14f8f2427856ba24cb7db922bda9bfd.zip | |
watchdog/core: Further simplify sysctl handling
Use a single function to update sysctl changes. This is not a high
frequency user space interface and it's root only.
Preparatory patch to cleanup the sysctl variable handling.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Don Zickus <dzickus@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Link: http://lkml.kernel.org/r/20170912194147.549114957@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 27 |
1 files changed, 7 insertions, 20 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 762d3ed82a08..ca8747221e87 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -507,11 +507,8 @@ static void softlockup_park_all_threads(void) softlockup_update_smpboot_threads(); } -/* - * Park threads which are not longer enabled and unpark threads which have - * been newly enabled. - */ -static void softlockup_update_threads(void) +/* Unpark enabled threads */ +static void softlockup_unpark_threads(void) { cpumask_copy(&watchdog_allowed_mask, &watchdog_cpumask); softlockup_update_smpboot_threads(); @@ -522,7 +519,7 @@ static void softlockup_reconfigure_threads(bool enabled) softlockup_park_all_threads(); set_sample_period(); if (enabled) - softlockup_update_threads(); + softlockup_unpark_threads(); } /* @@ -563,7 +560,6 @@ static inline void watchdog_unpark_threads(void) { } static inline int watchdog_enable_all_cpus(void) { return 0; } static inline void watchdog_disable_all_cpus(void) { } static inline void softlockup_init_threads(void) { } -static inline void softlockup_update_threads(void) { } static inline void softlockup_reconfigure_threads(bool enabled) { } #endif /* !CONFIG_SOFTLOCKUP_DETECTOR */ @@ -598,11 +594,11 @@ void lockup_detector_soft_poweroff(void) #ifdef CONFIG_SYSCTL -/* - * Update the run state of the lockup detectors. - */ +/* Propagate any changes to the watchdog threads */ static void proc_watchdog_update(void) { + /* Remove impossible cpus to keep sysctl output clean. */ + cpumask_and(&watchdog_cpumask, &watchdog_cpumask, cpu_possible_mask); softlockup_reconfigure_threads(watchdog_enabled && watchdog_thresh); watchdog_nmi_reconfigure(); } @@ -721,15 +717,6 @@ int proc_watchdog_thresh(struct ctl_table *table, int write, return err; } -static void proc_watchdog_cpumask_update(void) -{ - /* Remove impossible cpus to keep sysctl output clean. */ - cpumask_and(&watchdog_cpumask, &watchdog_cpumask, cpu_possible_mask); - - softlockup_update_threads(); - 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 @@ -746,7 +733,7 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write, err = proc_do_large_bitmap(table, write, buffer, lenp, ppos); if (!err && write) - proc_watchdog_cpumask_update(); + proc_watchdog_update(); mutex_unlock(&watchdog_mutex); cpu_hotplug_enable(); |