Commit a0c9cbb9 authored by Ulrich Obergfell's avatar Ulrich Obergfell Committed by Linus Torvalds
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watchdog: introduce the proc_watchdog_update() function

This series introduces a separate handler for each watchdog parameter in
/proc/sys/kernel.  The separate handlers need a common function that they
can call to update the run state of the lockup detectors, or to have the
lockup detectors use a new sample period.
Signed-off-by: default avatarUlrich Obergfell <>
Signed-off-by: default avatarDon Zickus <>
Cc: Ingo Molnar <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 84d56e66
......@@ -678,6 +678,29 @@ static void watchdog_disable_all_cpus(void)
* Update the run state of the lockup detectors.
static int proc_watchdog_update(void)
int err = 0;
* Watchdog threads won't be started if they are already active.
* The 'watchdog_running' variable in watchdog_*_all_cpus() takes
* care of this. If those threads are already active, the sample
* period will be updated and the lockup detectors will be enabled
* or disabled 'on the fly'.
if (watchdog_enabled && watchdog_thresh)
err = watchdog_enable_all_cpus(true);
return err;
* proc handler for /proc/sys/kernel/nmi_watchdog,watchdog_thresh
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