cgroup: remove cftype->release()

Now that pidlist files don't use cftype->release(), it doesn't have
any user left.  Remove it.

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

2 files changed, 0 insertions, 5 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 492fa01ec2d3..5207c28c2402 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -499,8 +499,6 @@ struct cftype {
          * kick type for multiplexing.
          */
         int (*trigger)(struct cgroup_subsys_state *css, unsigned int event);
-
-        int (*release)(struct inode *inode, struct file *file);
 };
 
 /*
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 1e09ded0387a..b59e3453eae7 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2448,12 +2448,9 @@ static int cgroup_file_open(struct inode *inode, struct file *file)
 static int cgroup_file_release(struct inode *inode, struct file *file)
 {
         struct cfent *cfe = __d_cfe(file->f_dentry);
-        struct cftype *cft = __d_cft(file->f_dentry);
         struct cgroup_subsys_state *css = cfe->css;
         int ret = 0;
 
-        if (cft->release)
-                ret = cft->release(inode, file);
         if (css->ss)
                 css_put(css);
         if (file->f_op == &cgroup_seqfile_operations)