Merge branch 'core/locking' into core/urgent

[linux-2.6-omap-h63xx.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 04160d277e7aeafe5b34e58da1bcb5a786b1696d..ace566bdfc680fff14c8ad5d9474aed45b15b7f5 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -600,7 +600,6 @@ struct rq {
        /* BKL stats */
        unsigned int bkl_count;
 #endif
-       struct lock_class_key rq_lock_key;
 };
 
 static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
@@ -2759,10 +2758,10 @@ static void double_rq_lock(struct rq *rq1, struct rq *rq2)
        } else {
                if (rq1 < rq2) {
                        spin_lock(&rq1->lock);
-                       spin_lock(&rq2->lock);
+                       spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
                } else {
                        spin_lock(&rq2->lock);
-                       spin_lock(&rq1->lock);
+                       spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
                }
        }
        update_rq_clock(rq1);
@@ -2805,14 +2804,21 @@ static int double_lock_balance(struct rq *this_rq, struct rq *busiest)
                if (busiest < this_rq) {
                        spin_unlock(&this_rq->lock);
                        spin_lock(&busiest->lock);
-                       spin_lock(&this_rq->lock);
+                       spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
                        ret = 1;
                } else
-                       spin_lock(&busiest->lock);
+                       spin_lock_nested(&busiest->lock, SINGLE_DEPTH_NESTING);
        }
        return ret;
 }
 
+static void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
+       __releases(busiest->lock)
+{
+       spin_unlock(&busiest->lock);
+       lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
+}
+
 /*
  * If dest_cpu is allowed for this process, migrate the task to it.
  * This is accomplished by forcing the cpu_allowed mask to only
@@ -3637,7 +3643,7 @@ redo:
                ld_moved = move_tasks(this_rq, this_cpu, busiest,
                                        imbalance, sd, CPU_NEWLY_IDLE,
                                        &all_pinned);
-               spin_unlock(&busiest->lock);
+               double_unlock_balance(this_rq, busiest);
 
                if (unlikely(all_pinned)) {
                        cpu_clear(cpu_of(busiest), *cpus);
@@ -3752,7 +3758,7 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
                else
                        schedstat_inc(sd, alb_failed);
        }
-       spin_unlock(&target_rq->lock);
+       double_unlock_balance(busiest_rq, target_rq);
 }
 
 #ifdef CONFIG_NO_HZ
@@ -8000,7 +8006,6 @@ void __init sched_init(void)
 
                rq = cpu_rq(i);
                spin_lock_init(&rq->lock);
-               lockdep_set_class(&rq->lock, &rq->rq_lock_key);
                rq->nr_running = 0;
                init_cfs_rq(&rq->cfs, rq);
                init_rt_rq(&rq->rt, rq);