[PATCH 21/24] cgroup: define empty css_put() when !CONFIG_CGROUPS

[Wu Fengguang]

It will be used by the hwpoison inject code for releasing the
css grabbed by try_get_mem_cgroup_from_page().

CC: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
CC: Li Zefan <lizf@xxxxxxxxxxxxxx>
CC: Paul Menage <menage@xxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 include/linux/cgroup.h |    3 +++
 1 file changed, 3 insertions(+)

--- linux-mm.orig/include/linux/cgroup.h	2009-11-02 10:18:41.000000000 +0800
+++ linux-mm/include/linux/cgroup.h	2009-11-02 10:26:22.000000000 +0800
@@ -581,6 +581,9 @@ static inline int cgroupstats_build(stru
 	return -EINVAL;
 }
 
+struct cgroup_subsys_state;
+static inline void css_put(struct cgroup_subsys_state *css) {}
+
 #endif /* !CONFIG_CGROUPS */
 
 #endif /* _LINUX_CGROUP_H */


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