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sched: fix incorrect irq lock usage in normalize_rt_tasks() 

lockdep spotted this bogus irq locking. normalize_rt_tasks() can be called
from hardirq context through sysrq-n

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-02-13 15:45:39 +01:00 committed by Ingo Molnar
parent 8ed3699682
commit 4cf5d77a6e
1 changed files with 4 additions and 4 deletions
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8
kernel/sched.c
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@ -7291,7 +7291,7 @@ void normalize_rt_tasks(void)
unsigned long flags;
struct rq *rq;
read_lock_irq(&tasklist_lock);
read_lock_irqsave(&tasklist_lock, flags);
do_each_thread(g, p) {
/*
* Only normalize user tasks:
@ -7317,16 +7317,16 @@ void normalize_rt_tasks(void)
continue;
}
spin_lock_irqsave(&p->pi_lock, flags);
spin_lock(&p->pi_lock);
rq = __task_rq_lock(p);
normalize_task(rq, p);
__task_rq_unlock(rq);
spin_unlock_irqrestore(&p->pi_lock, flags);
spin_unlock(&p->pi_lock);
} while_each_thread(g, p);
read_unlock_irq(&tasklist_lock);
read_unlock_irqrestore(&tasklist_lock, flags);
}
#endif /* CONFIG_MAGIC_SYSRQ */