cgroup: unexport cgroup_css()

cgroup_css() no longer has any user left outside cgroup.c proper and
we don't want subsystems to grow new usages of the function.  cgroup
core should always provide the css to use to the subsystems, which
will make dynamic creation and destruction of css's across the
lifetime of a cgroup much more manageable than exposing the cgroup
directly to subsystems and let them dereference css's from it.

Make cgroup_css() a static function in cgroup.c.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e5bfb2a81dcb..c02a288a4e3d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -222,6 +222,19 @@ static int cgroup_destroy_locked(struct cgroup *cgrp);
 static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
 			      bool is_add);
 
+/**
+ * cgroup_css - obtain a cgroup's css for the specified subsystem
+ * @cgrp: the cgroup of interest
+ * @subsys_id: the subsystem of interest
+ *
+ * Return @cgrp's css (cgroup_subsys_state) associated with @subsys_id.
+ */
+static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
+					      int subsys_id)
+{
+	return cgrp->subsys[subsys_id];
+}
+
 /* convenient tests for these bits */
 static inline bool cgroup_is_dead(const struct cgroup *cgrp)
 {