Merge remote branch 'intel/drm-intel-next' of /ssd/git/drm-next into drm-core-next

* 'intel/drm-intel-next' of /ssd/git/drm-next: (771 commits)
  drm/i915: Undo "Uncouple render/power ctx before suspending"
  drm/i915: Allow the application to choose the constant addressing mode
  drm/i915: dynamic render p-state support for Sandy Bridge
  drm/i915: Enable EI mode for RCx decision making on Sandybridge
  drm/i915/sdvo: Border and stall select became test bits in gen5
  drm/i915: Add Guess-o-matic for pageflip timestamping.
  drm/i915: Add support for precise vblank timestamping (v2)
  drm/i915: Add frame buffer compression on Sandybridge
  drm/i915: Add self-refresh support on Sandybridge
  drm/i915: Wait for vblank before unpinning old fb
  Revert "drm/i915: Avoid using PIPE_CONTROL on Ironlake"
  drm/i915: Pass clock limits down to PLL matcher
  drm/i915: Poll for seqno completion if IRQ is disabled
  drm/i915/ringbuffer: Make IRQ refcnting atomic
  agp/intel: Fix missed cached memory flags setting in i965_write_entry()
  drm/i915/sdvo: Only use the SDVO pin if it is in the valid range
  drm/i915: Enable RC6 autodownclocking on Sandybridge
  drm/i915: Terminate the FORCE WAKE after we have finished reading
  drm/i915/gtt: Clear the cachelines upon resume
  drm/i915: Restore GTT mapping first upon resume
  ...

1 files changed, 24 insertions, 7 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9260314a221..2c6523af547 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -34,6 +34,23 @@
 
 #include "internal.h"
 
+DEFINE_MUTEX(mem_hotplug_mutex);
+
+void lock_memory_hotplug(void)
+{
+	mutex_lock(&mem_hotplug_mutex);
+
+	/* for exclusive hibernation if CONFIG_HIBERNATION=y */
+	lock_system_sleep();
+}
+
+void unlock_memory_hotplug(void)
+{
+	unlock_system_sleep();
+	mutex_unlock(&mem_hotplug_mutex);
+}
+
+
 /* add this memory to iomem resource */
 static struct resource *register_memory_resource(u64 start, u64 size)
 {
@@ -493,7 +510,7 @@ int mem_online_node(int nid)
 	pg_data_t	*pgdat;
 	int	ret;
 
-	lock_system_sleep();
+	lock_memory_hotplug();
 	pgdat = hotadd_new_pgdat(nid, 0);
 	if (pgdat) {
 		ret = -ENOMEM;
@@ -504,7 +521,7 @@ int mem_online_node(int nid)
 	BUG_ON(ret);
 
 out:
-	unlock_system_sleep();
+	unlock_memory_hotplug();
 	return ret;
 }
 
@@ -516,7 +533,7 @@ int __ref add_memory(int nid, u64 start, u64 size)
 	struct resource *res;
 	int ret;
 
-	lock_system_sleep();
+	lock_memory_hotplug();
 
 	res = register_memory_resource(start, size);
 	ret = -EEXIST;
@@ -563,7 +580,7 @@ error:
 		release_memory_resource(res);
 
 out:
-	unlock_system_sleep();
+	unlock_memory_hotplug();
 	return ret;
 }
 EXPORT_SYMBOL_GPL(add_memory);
@@ -791,7 +808,7 @@ static int offline_pages(unsigned long start_pfn,
 	if (!test_pages_in_a_zone(start_pfn, end_pfn))
 		return -EINVAL;
 
-	lock_system_sleep();
+	lock_memory_hotplug();
 
 	zone = page_zone(pfn_to_page(start_pfn));
 	node = zone_to_nid(zone);
@@ -880,7 +897,7 @@ repeat:
 	writeback_set_ratelimit();
 
 	memory_notify(MEM_OFFLINE, &arg);
-	unlock_system_sleep();
+	unlock_memory_hotplug();
 	return 0;
 
 failed_removal:
@@ -891,7 +908,7 @@ failed_removal:
 	undo_isolate_page_range(start_pfn, end_pfn);
 
 out:
-	unlock_system_sleep();
+	unlock_memory_hotplug();
 	return ret;
 }