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authorLi Zefan <lizefan@huawei.com>2014-03-28 15:18:27 +0800
committerTejun Heo <tj@kernel.org>2014-03-29 09:15:53 -0400
commite8604cb43690b781f9a7ad4a770f3e10259fe939 (patch)
tree0feff5f9e9efe957a6f74a2cb23dc753428d87de /kernel
parent01a971406177c2ca9834be6914a67e20f463a3e6 (diff)
downloadop-kernel-dev-e8604cb43690b781f9a7ad4a770f3e10259fe939.zip
op-kernel-dev-e8604cb43690b781f9a7ad4a770f3e10259fe939.tar.gz
cgroup: fix spurious lockdep warning in cgroup_exit()
cgroup_exit() is called in fork and exit path. If it's called in the failure path during fork, PF_EXITING isn't set, and then lockdep will complain. Fix this by removing cgroup_exit() in that failure path. cgroup_fork() does nothing that needs cleanup. Reported-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup.c3
-rw-r--r--kernel/fork.c5
2 files changed, 3 insertions, 5 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e378cb2..60fd6f1 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4431,8 +4431,7 @@ void cgroup_post_fork(struct task_struct *child)
* notify_on_release(), then leave the task attached to the root cgroup in
* each hierarchy for the remainder of its exit. No need to bother with
* init_css_set refcnting. init_css_set never goes away and we can't race
- * with migration path - either PF_EXITING is visible to migration path or
- * @tsk never got on the tasklist.
+ * with migration path - PF_EXITING is visible to migration path.
*/
void cgroup_exit(struct task_struct *tsk, int run_callbacks)
{
diff --git a/kernel/fork.c b/kernel/fork.c
index a17621c..8852b34 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1271,7 +1271,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (IS_ERR(p->mempolicy)) {
retval = PTR_ERR(p->mempolicy);
p->mempolicy = NULL;
- goto bad_fork_cleanup_cgroup;
+ goto bad_fork_cleanup_threadgroup_lock;
}
mpol_fix_fork_child_flag(p);
#endif
@@ -1524,11 +1524,10 @@ bad_fork_cleanup_policy:
perf_event_free_task(p);
#ifdef CONFIG_NUMA
mpol_put(p->mempolicy);
-bad_fork_cleanup_cgroup:
+bad_fork_cleanup_threadgroup_lock:
#endif
if (clone_flags & CLONE_THREAD)
threadgroup_change_end(current);
- cgroup_exit(p, 0);
delayacct_tsk_free(p);
module_put(task_thread_info(p)->exec_domain->module);
bad_fork_cleanup_count:
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