Linux v3.14-12812-g321d03c86732

1 files changed, 0 insertions, 79 deletions

diff --git a/btrfs-fix-lockdep-warning-with-reclaim-lock-inversion.patch b/btrfs-fix-lockdep-warning-with-reclaim-lock-inversion.patch
deleted file mode 100644
index c158729d3..000000000
--- a/btrfs-fix-lockdep-warning-with-reclaim-lock-inversion.patch
+++ /dev/null
@@ -1,79 +0,0 @@
-From patchwork Wed Mar 26 18:11:26 2014
-Content-Type: text/plain; charset="utf-8"
-MIME-Version: 1.0
-Content-Transfer-Encoding: 7bit
-Subject: btrfs: fix lockdep warning with reclaim lock inversion
-From: Jeff Mahoney <jeffm@suse.com>
-X-Patchwork-Id: 3894781
-Message-Id: <5333184E.3090609@suse.com>
-To: linux-btrfs <linux-btrfs@vger.kernel.org>
-Date: Wed, 26 Mar 2014 14:11:26 -0400
-
-When encountering memory pressure, testers have run into the following
-lockdep warning. It was caused by __link_block_group calling kobject_add
-with the groups_sem held. kobject_add calls kvasprintf with GFP_KERNEL,
-which gets us into reclaim context. The kobject doesn't actually need
-to be added under the lock -- it just needs to ensure that it's only
-added for the first block group to be linked.
-
-
-=========================================================
-[ INFO: possible irq lock inversion dependency detected ]
-3.14.0-rc8-default #1 Not tainted
----------------------------------------------------------
-kswapd0/169 just changed the state of lock:
- (&delayed_node->mutex){+.+.-.}, at: [<ffffffffa018baea>] __btrfs_release_delayed_node+0x3a/0x200 [btrfs]
-but this lock took another, RECLAIM_FS-unsafe lock in the past:
- (&found->groups_sem){+++++.}
-
-and interrupts could create inverse lock ordering between them.
-
-other info that might help us debug this:
- Possible interrupt unsafe locking scenario:
-       CPU0                    CPU1
-       ----                    ----
-  lock(&found->groups_sem);
-                               local_irq_disable();
-                               lock(&delayed_node->mutex);
-                               lock(&found->groups_sem);
-  <Interrupt>
-    lock(&delayed_node->mutex);
-
- *** DEADLOCK ***
-2 locks held by kswapd0/169:
- #0:  (shrinker_rwsem){++++..}, at: [<ffffffff81159e8a>] shrink_slab+0x3a/0x160
- #1:  (&type->s_umount_key#27){++++..}, at: [<ffffffff811bac6f>] grab_super_passive+0x3f/0x90
-
-Signed-off-by: Jeff Mahoney <jeffm@suse.com>
----
- fs/btrfs/extent-tree.c |   10 +++++++---
- 1 file changed, 7 insertions(+), 3 deletions(-)
-
---- a/fs/btrfs/extent-tree.c
-+++ b/fs/btrfs/extent-tree.c
-@@ -8343,9 +8343,15 @@ static void __link_block_group(struct bt
- 			       struct btrfs_block_group_cache *cache)
- {
- 	int index = get_block_group_index(cache);
-+	bool first = false;
- 
- 	down_write(&space_info->groups_sem);
--	if (list_empty(&space_info->block_groups[index])) {
-+	if (list_empty(&space_info->block_groups[index]))
-+		first = true;
-+	list_add_tail(&cache->list, &space_info->block_groups[index]);
-+	up_write(&space_info->groups_sem);
-+
-+	if (first) {
- 		struct kobject *kobj = &space_info->block_group_kobjs[index];
- 		int ret;
- 
-@@ -8357,8 +8363,6 @@ static void __link_block_group(struct bt
- 			kobject_put(&space_info->kobj);
- 		}
- 	}
--	list_add_tail(&cache->list, &space_info->block_groups[index]);
--	up_write(&space_info->groups_sem);
- }
- 
- static struct btrfs_block_group_cache *