The patch titled
Subject: mm-slub-fix-a-deadlock-in-show_slab_objects-fix
has been added to the -mm tree. Its filename is
mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-slub-fix-a-deadlock-in-show_slab_objects-fix
add comment explaining why we don't need mem_hotplug_lock
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/slub.c~mm-slub-fix-a-deadlock-in-show_slab_objects-fix
+++ a/mm/slub.c
@@ -4851,6 +4851,10 @@ static ssize_t show_slab_objects(struct
* already held which will conflict with an existing lock order:
*
* mem_hotplug_lock->slab_mutex->kernfs_mutex
+ *
+ * We don't really need mem_hotplug_lock (to hold off
+ * slab_mem_going_offline_callback) here because slab's memory hot
+ * unplug code doesn't destroy the kmem_cache->node[] data.
*/
#ifdef CONFIG_SLUB_DEBUG
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
mm-slub-fix-a-deadlock-in-show_slab_objects-fix.patch
ocfs2-protect-extent-tree-in-the-ocfs2_prepare_inode_for_write-checkpatch-fixes.patch
mm.patch
mm-pgmap-use-correct-alignment-when-looking-at-first-pfn-from-a-region-checkpatch-fixes.patch
mm-rmapc-reuse-mergeable-anon_vma-as-parent-when-fork-fix.patch
mm-oom-avoid-printk-iteration-under-rcu-fix.patch
hugetlb-remove-duplicated-code-checkpatch-fixes.patch
hugetlb-remove-unused-hstate-in-hugetlb_fault_mutex_hash-fix.patch
linux-next-rejects.patch
linux-next-git-rejects.patch
diff-sucks.patch
samples-watch_queue-watch_test-fix-build.patch
drivers-tty-serial-sh-scic-suppress-warning.patch
kernel-forkc-export-kernel_thread-to-modules.patch
