[PATCH v2 4/6] cgroup: remove duplicate RCU free on struct cgroup

Li Zefan
2013-01-24T06:33:10Z

When destroying a cgroup, though in cgroup_diput() we've called
synchronize_rcu(), we then still have to free it via call_rcu().

The story is, long ago to fix a race between reading /proc/sched_debug
and freeing cgroup, the code was changed to utilize call_rcu(). See
commit a47295e6bc42ad35f9c15ac66f598aa24debd4e2 ("cgroups: make
cgroup_path() RCU-safe")

As we've fixed cpu cgroup that cpu_cgroup_offline_css() is used
to unregister a task_group so there won't be concurrent access
to this task_group after synchronize_rcu() in diput(). Now we can
just kfree(cgrp).

Signed-off-by: Li Zefan <lizefan@huawei.com>
---
kernel/cgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b9a76e2..a39e2b0 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -892,7 +892,7 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
simple_xattrs_free(&cgrp->xattrs);

ida_simple_remove(&cgrp->root->cgroup_ida, cgrp->id);
- kfree_rcu(cgrp, rcu_head);
+ kfree(cgrp);
} else {
struct cfent *cfe = __d_cfe(dentry);
struct cgroup *cgrp = dentry->d_parent->d_fsdata;
--
1.8.0.2