commit 1d615482547584b9a8bb6316a58fed6ce90dd9ff
author Thomas Gleixner <tglx@linutronix.de> Tue Nov 17 14:54:03 2009 +0100
committer Thomas Gleixner <tglx@linutronix.de> Mon Dec 14 23:55:33 2009 +0100
tree 21dae4b70acb3ce0bdaeeaee1dbd970be41d26e2
parent fe841226bd954fba4fd79f037a876053fe9c3217

sched: Convert pi_lock to raw_spinlock

Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>

kernel/sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 01c5016..18cceee 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6323,7 +6323,7 @@
 	 * make sure no PI-waiters arrive (or leave) while we are
 	 * changing the priority of the task:
 	 */
-	spin_lock_irqsave(&p->pi_lock, flags);
+	raw_spin_lock_irqsave(&p->pi_lock, flags);
 	/*
 	 * To be able to change p->policy safely, the apropriate
 	 * runqueue lock must be held.
@@ -6333,7 +6333,7 @@
 	if (unlikely(oldpolicy != -1 && oldpolicy != p->policy)) {
 		policy = oldpolicy = -1;
 		__task_rq_unlock(rq);
-		spin_unlock_irqrestore(&p->pi_lock, flags);
+		raw_spin_unlock_irqrestore(&p->pi_lock, flags);
 		goto recheck;
 	}
 	update_rq_clock(rq);
@@ -6357,7 +6357,7 @@
 		check_class_changed(rq, p, prev_class, oldprio, running);
 	}
 	__task_rq_unlock(rq);
-	spin_unlock_irqrestore(&p->pi_lock, flags);
+	raw_spin_unlock_irqrestore(&p->pi_lock, flags);
 
 	rt_mutex_adjust_pi(p);
 
@@ -9624,7 +9624,7 @@
 #endif
 
 #ifdef CONFIG_RT_MUTEXES
-	plist_head_init(&init_task.pi_waiters, &init_task.pi_lock);
+	plist_head_init_raw(&init_task.pi_waiters, &init_task.pi_lock);
 #endif
 
 	/*
@@ -9749,13 +9749,13 @@
 			continue;
 		}
 
-		spin_lock(&p->pi_lock);
+		raw_spin_lock(&p->pi_lock);
 		rq = __task_rq_lock(p);
 
 		normalize_task(rq, p);
 
 		__task_rq_unlock(rq);
-		spin_unlock(&p->pi_lock);
+		raw_spin_unlock(&p->pi_lock);
 	} while_each_thread(g, p);
 
 	read_unlock_irqrestore(&tasklist_lock, flags);