cgroup: warn if "xattr" is specified with "sane_behavior"
Mount option "xattr" is no longer necessary as it's enabled by default
on kernfs. Warn if "xattr" is specified with "sane_behavior" so that
the option can be removed in the future.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 0e45a93..305e94e 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -264,6 +264,8 @@
* - "release_agent" and "notify_on_release" are removed.
* Replacement notification mechanism will be implemented.
*
+ * - "xattr" mount option is deprecated. kernfs always enables it.
+ *
* - cpuset: tasks will be kept in empty cpusets when hotplug happens
* and take masks of ancestors with non-empty cpus/mems, instead of
* being moved to an ancestor.