watchdog: introduce the proc_watchdog_update() function (a0c9cbb9) · Commits · 戴 / test

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:

Ulrich Obergfell <uobergfe@redhat.com> Signed-off-by:

Don Zickus <dzickus@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

kernel/watchdog.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -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);
		else
		watchdog_disable_all_cpus();

		return err;

		}

		/*
		* proc handler for /proc/sys/kernel/nmi_watchdog,watchdog_thresh
		*/

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