linux-kernel - [GIT pull] sched/urgent for v5.7

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Message-ID: <159093352092.1582.2279719529823662123.tglx@nanos.tec.linutronix.de>
Date:   Sun, 31 May 2020 13:58:40 -0000
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] sched/urgent for v5.7

Linus,

please pull the latest sched/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-2020-05-31

up to:  18f855e574d9: sched/fair: Don't NUMA balance for kthreads


A single scheduler fix preventing a crash in NUMA balancing. The
current->mm check is not reliable as the mm might be temporary
due to use_mm() in a kthread. Check for PF_KTHREAD explictely.

Thanks,

	tglx

------------------>
Jens Axboe (1):
      sched/fair: Don't NUMA balance for kthreads


 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 538ba5d94e99..da3e5b54715b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2908,7 +2908,7 @@ static void task_tick_numa(struct rq *rq, struct task_struct *curr)
 	/*
 	 * We don't care about NUMA placement if we don't have memory.
 	 */
-	if (!curr->mm || (curr->flags & PF_EXITING) || work->next != work)
+	if ((curr->flags & (PF_EXITING | PF_KTHREAD)) || work->next != work)
 		return;
 
 	/*