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>

diff --git a/kernel/sched.c b/kernel/sched.c
index 6b02276baaa65d16c3d9aeb68cdfe7dcc7728324..88a17c7128c3b4639a6bf69703a01a5ca4ffd85a 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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 */