The drain_local_pages_wq() uses preempt_disable() to ensure that there will be no CPU migration while drain_local_pages() is invoked which might happen if the CPU is going down. drain_local_pages() acquires a sleeping lock on RT which can not be acquired with disabled preemption. Use migrate_disable() instead of preempt_disable(): On RT it ensures that the CPU won't go down and on !RT it is replaced with preempt_disable(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> --- mm/page_alloc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 99a51dfed59c7..7df9930628c2b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2912,9 +2912,9 @@ static void drain_local_pages_wq(struct work_struct *work) * cpu which is allright but we also have to make sure to not move to * a different one. */ - preempt_disable(); + migrate_disable(); drain_local_pages(drain->zone); - preempt_enable(); + migrate_enable(); } /* -- 2.26.0.rc2
