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authorLi Zefan <lizf@cn.fujitsu.com>2009-02-11 13:04:36 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 14:25:36 -0800
commitcfebe563bd0a3ff97e1bc167123120d59c7a84db (patch)
tree6178bf45bcccaf3d43d87cfe0eef059d849c7140 /include/linux/cgroup.h
parent01c4a4283137d24c9cc3785f1f312e895a18f273 (diff)
downloadop-kernel-dev-cfebe563bd0a3ff97e1bc167123120d59c7a84db.zip
op-kernel-dev-cfebe563bd0a3ff97e1bc167123120d59c7a84db.tar.gz
cgroups: fix lockdep subclasses overflow
I enabled all cgroup subsystems when compiling kernel, and then: # mount -t cgroup -o net_cls xxx /mnt # mkdir /mnt/0 This showed up immediately: BUG: MAX_LOCKDEP_SUBCLASSES too low! turning off the locking correctness validator. It's caused by the cgroup hierarchy lock: for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) { struct cgroup_subsys *ss = subsys[i]; if (ss->root == root) mutex_lock_nested(&ss->hierarchy_mutex, i); } Now we have 9 cgroup subsystems, and the above 'i' for net_cls is 8, but MAX_LOCKDEP_SUBCLASSES is 8. This patch uses different lockdep keys for different subsystems. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/cgroup.h')
-rw-r--r--include/linux/cgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index e4e8e11..499900d 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -378,6 +378,7 @@ struct cgroup_subsys {
* - initiating hotplug events
*/
struct mutex hierarchy_mutex;
+ struct lock_class_key subsys_key;
/*
* Link to parent, and list entry in parent's children.
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