Messages in this thread Patch in this message | | | From | Ulrich Obergfell <> | Subject | [PATCH v2 2/9] watchdog: introduce the proc_watchdog_update() function | Date | Fri, 17 Oct 2014 19:06:21 +0200 |
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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> --- kernel/watchdog.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index f8da756..da16a50 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -679,6 +679,29 @@ 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 */ -- 1.7.11.7
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