From: Thomas Gleixner tglx@linutronix.de
stable inclusion from linux-4.19.164 commit b6b6ba5754eee1907497504e4b31e22c78f7670f
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[ Upstream commit 345a957fcc95630bf5535d7668a59ed983eb49a7 ]
do_sched_yield() invokes schedule() with interrupts disabled which is not allowed. This goes back to the pre git era to commit a6efb709806c ("[PATCH] irqlock patch 2.5.27-H6") in the history tree.
Reenable interrupts and remove the misleading comment which "explains" it.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/87r1pt7y5c.fsf@nanos.tec.linutronix.de Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- kernel/sched/core.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0d0527cdcd4e..e89fbd222783 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5020,12 +5020,8 @@ static void do_sched_yield(void) schedstat_inc(rq->yld_count); current->sched_class->yield_task(rq);
- /* - * Since we are going to call schedule() anyway, there's - * no need to preempt or enable interrupts: - */ preempt_disable(); - rq_unlock(rq, &rf); + rq_unlock_irq(rq, &rf); sched_preempt_enable_no_resched();
schedule();