cgroup: introduce coalesce css_get() and css_put()

[pandora-kernel.git] / include / linux / cgroup.h

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index d08cfe7..14160b5 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -76,6 +76,12 @@ enum {
        CSS_REMOVED, /* This CSS is dead */
 };
 
+/* Caller must verify that the css is not for root cgroup */
+static inline void __css_get(struct cgroup_subsys_state *css, int count)
+{
+       atomic_add(count, &css->refcnt);
+}
+
 /*
  * Call css_get() to hold a reference on the css; it can be used
  * for a reference obtained via:
@@ -87,7 +93,7 @@ static inline void css_get(struct cgroup_subsys_state *css)
 {
        /* We don't need to reference count the root state */
        if (!test_bit(CSS_ROOT, &css->flags))
-               atomic_inc(&css->refcnt);
+               __css_get(css, 1);
 }
 
 static inline bool css_is_removed(struct cgroup_subsys_state *css)
@@ -118,11 +124,11 @@ static inline bool css_tryget(struct cgroup_subsys_state *css)
  * css_get() or css_tryget()
  */
 
-extern void __css_put(struct cgroup_subsys_state *css);
+extern void __css_put(struct cgroup_subsys_state *css, int count);
 static inline void css_put(struct cgroup_subsys_state *css)
 {
        if (!test_bit(CSS_ROOT, &css->flags))
-               __css_put(css);
+               __css_put(css, 1);
 }
 
 /* bits in struct cgroup flags field */