[PATCH] watchdog: ignore nohz_full cores in new cpumask

From: Zqiang
Date: Fri Nov 12 2021 - 00:14:43 EST


If the nohz_full is enabled, when update watchdog_mask, the
nohz_full cores should be ignored.

Signed-off-by: Zqiang <qiang.zhang1211@xxxxxxxxx>
---
kernel/watchdog.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index ad912511a0c0..3ef11a94783c 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))
+ return;
lockup_detector_reconfigure();
}

--
2.17.1