cgroup: remove bogus comments in cgroup_diput()

Since commit 48ddbe194623ae089cc0576e60363f2d2e85662a
("cgroup: make css->refcnt clearing on cgroup removal optional"),
each css holds a ref on cgroup's dentry, so cgroup_diput() won't be
called until all css' refs go down to 0, which invalids the comments.

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

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 02e4f201472e1c213d3a8b87af0fcc80582ffb87..800852282c210b5b184ef616d8080c218c75b938 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -899,12 +899,6 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
                struct cgroup *cgrp = dentry->d_fsdata;
 
                BUG_ON(!(cgroup_is_removed(cgrp)));
-               /* It's possible for external users to be holding css
-                * reference counts on a cgroup; css_put() needs to
-                * be able to access the cgroup after decrementing
-                * the reference count in order to know if it needs to
-                * queue the cgroup to be handled by the release
-                * agent */
                call_rcu(&cgrp->rcu_head, cgroup_free_rcu);
        } else {
                struct cfent *cfe = __d_cfe(dentry);