[Devel] [PATCH 1/4] don't trigger warning when d_subdirs is not empty.

[Glauber Costa]

It is never empty at this point, because of the self references.
a better test is to see if any of them gets d_inode set.

Signed-off-by: Glauber Costa <glommer at parallels.com>
CC: Tejun Heo <tj at kernel.org>
---
 kernel/cgroup.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index cf7b298..b45a653 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -947,10 +947,16 @@ static int cgroup_rm_file(struct cgroup *cgrp, const struct cftype *cft)
 static void cgroup_clear_directory(struct dentry *dir)
 {
 	struct cgroup *cgrp = __d_cgrp(dir);
+	struct list_head *child;
 
 	while (!list_empty(&cgrp->files))
 		cgroup_rm_file(cgrp, NULL);
-	WARN_ON_ONCE(!list_empty(&dir->d_subdirs));
+
+	list_for_each(child, &dir->d_subdirs) {
+		struct dentry *d;
+		d = list_entry(child, struct dentry, d_u.d_child);
+		WARN_ON_ONCE(d->d_inode);
+	}
 }
 
 /*
-- 
1.7.7.6