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Subject[PATCH V2] watchdog: ignore nohz_full cores in new cpumask
Date
If the nohz_full is enabled, when update watchdog_mask, the
nohz_full cores should be ignored.

Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
---
v1->v2:
if watchdog_cpumask became empty, set housekeeping_cpumask.

kernel/watchdog.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index ad912511a0c0..6f0c5528b399 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -628,7 +628,9 @@ void lockup_detector_soft_poweroff(void)
static void proc_watchdog_update(void)
{
/* Remove impossible cpus to keep sysctl output clean. */
- cpumask_and(&watchdog_cpumask, &watchdog_cpumask, cpu_possible_mask);
+ cpumask_and(&watchdog_cpumask, &watchdog_cpumask, housekeeping_cpumask(HK_FLAG_TIMER));
+ if (cpumask_empty(&watchdog_cpumask))
+ cpumask_copy(&watchdog_cpumask, housekeeping_cpumask(HK_FLAG_TIMER));
lockup_detector_reconfigure();
}

--
2.17.1
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