cgroup: unexport cgroup_css() and remove __file_cft()

Now that cgroup_event is made memcg specific, the temporarily exported
functions are no longer necessary.  Unexport cgroup_css() and remove
__file_cft() which doesn't have any user left.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

1 files changed, 2 insertions, 12 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index feda7c54fa6b..c0248e16461d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -202,8 +202,8 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
  * keep accessing it outside the said locks.  This function may return
  * %NULL if @cgrp doesn't have @subsys_id enabled.
  */
-struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
-                                       struct cgroup_subsys *ss)
+static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
+                                              struct cgroup_subsys *ss)
 {
         if (ss)
                 return rcu_dereference_check(cgrp->subsys[ss->subsys_id],
@@ -2625,16 +2625,6 @@ static const struct inode_operations cgroup_dir_inode_operations = {
         .removexattr = cgroup_removexattr,
 };
 
-/*
- * Check if a file is a control file
- */
-struct cftype *__file_cft(struct file *file)
-{
-        if (file_inode(file)->i_fop != &cgroup_file_operations)
-                return ERR_PTR(-EINVAL);
-        return __d_cft(file->f_dentry);
-}
-
 static int cgroup_create_file(struct dentry *dentry, umode_t mode,
                                 struct super_block *sb)
 {