Merge branch 'linus' into sched/locking

Merge reason: Pick up this upstream commit:

  6631e635c65d: block: don't flush plugged IO on forced preemtion scheduling

As it modifies the scheduler and we'll queue up dependent patches.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 15 insertions, 11 deletions

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 4603f08dc47b..6de9a8fc3417 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -18,9 +18,13 @@ config SUSPEND_FREEZER
 
           Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config HIBERNATE_CALLBACKS
+        bool
+
 config HIBERNATION
         bool "Hibernation (aka 'suspend to disk')"
         depends on SWAP && ARCH_HIBERNATION_POSSIBLE
+        select HIBERNATE_CALLBACKS
         select LZO_COMPRESS
         select LZO_DECOMPRESS
         ---help---
@@ -85,7 +89,7 @@ config PM_STD_PARTITION
 
 config PM_SLEEP
         def_bool y
-        depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
+        depends on SUSPEND || HIBERNATE_CALLBACKS
 
 config PM_SLEEP_SMP
         def_bool y
diff --git a/kernel/sched.c b/kernel/sched.c
index 48013633d792..a187c3fe027b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4111,20 +4111,20 @@ need_resched:
                                         try_to_wake_up_local(to_wakeup);
                         }
                         deactivate_task(rq, prev, DEQUEUE_SLEEP);
+
+                        /*
+                         * If we are going to sleep and we have plugged IO queued, make
+                         * sure to submit it to avoid deadlocks.
+                         */
+                        if (blk_needs_flush_plug(prev)) {
+                                raw_spin_unlock(&rq->lock);
+                                blk_flush_plug(prev);
+                                raw_spin_lock(&rq->lock);
+                        }
                 }
                 switch_count = &prev->nvcsw;
         }
 
-        /*
-         * If we are going to sleep and we have plugged IO queued, make
-         * sure to submit it to avoid deadlocks.
-         */
-        if (prev->state != TASK_RUNNING && blk_needs_flush_plug(prev)) {
-                raw_spin_unlock(&rq->lock);
-                blk_flush_plug(prev);
-                raw_spin_lock(&rq->lock);
-        }
-
         pre_schedule(rq, prev);
 
         if (unlikely(!rq->nr_running))