xfs: fix might_sleep() warning when initialising per-ag tree

[safe/jmp/linux-2.6] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 595d03f..8a79a6f 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -811,12 +811,10 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
         * enabled in "curr" and "curr" is a child of "mem" in *cgroup*
         * hierarchy(even if use_hierarchy is disabled in "mem").
         */
-       rcu_read_lock();
        if (mem->use_hierarchy)
                ret = css_is_ancestor(&curr->css, &mem->css);
        else
                ret = (curr == mem);
-       rcu_read_unlock();
        css_put(&curr->css);
        return ret;
 }
@@ -1603,7 +1601,6 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
                         * There is a small race that "from" or "to" can be
                         * freed by rmdir, so we use css_tryget().
                         */
-                       rcu_read_lock();
                        from = mc.from;
                        to = mc.to;
                        if (from && css_tryget(&from->css)) {
@@ -1624,7 +1621,6 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
                                        do_continue = (to == mem_over_limit);
                                css_put(&to->css);
                        }
-                       rcu_read_unlock();
                        if (do_continue) {
                                DEFINE_WAIT(wait);
                                prepare_to_wait(&mc.waitq, &wait,