Merge commit 'v2.6.39-rc2' into spi/merge

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index f592ce6f861..a8845516ace 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5011,6 +5011,17 @@ recheck:
                 return -EINVAL;
         }
 
+        /*
+         * If not changing anything there's no need to proceed further:
+         */
+        if (unlikely(policy == p->policy && (!rt_policy(policy) ||
+                        param->sched_priority == p->rt_priority))) {
+
+                __task_rq_unlock(rq);
+                raw_spin_unlock_irqrestore(&p->pi_lock, flags);
+                return 0;
+        }
+
 #ifdef CONFIG_RT_GROUP_SCHED
         if (user) {
                 /*