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sched: Reenable interrupts in do_sched_yield() 

[ Upstream commit 345a957fcc ]

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: 1da177e4c3 ("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>
5.4-rM2-2.2.x-imx-squashed
Thomas Gleixner 2020-10-20 16:46:55 +02:00 committed by Greg Kroah-Hartman
parent 35975f2e83
commit 52f525f2bd
1 changed files with 1 additions and 5 deletions
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6
kernel/sched/core.c
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@ -5679,12 +5679,8 @@ 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();