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Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c34
1 files changed, 11 insertions, 23 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1262a8bc402b..96cd9ebefb2c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2678,15 +2678,13 @@ static int mem_cgroup_move_parent(struct page *page,
struct mem_cgroup *child,
gfp_t gfp_mask)
{
- struct cgroup *cg = child->css.cgroup;
- struct cgroup *pcg = cg->parent;
struct mem_cgroup *parent;
unsigned int nr_pages;
unsigned long uninitialized_var(flags);
int ret;
/* Is ROOT ? */
- if (!pcg)
+ if (mem_cgroup_is_root(child))
return -EINVAL;
ret = -EBUSY;
@@ -2697,33 +2695,23 @@ static int mem_cgroup_move_parent(struct page *page,
nr_pages = hpage_nr_pages(page);
- parent = mem_cgroup_from_cont(pcg);
- if (!parent->use_hierarchy) {
- ret = __mem_cgroup_try_charge(NULL,
- gfp_mask, nr_pages, &parent, false);
- if (ret)
- goto put_back;
- }
+ parent = parent_mem_cgroup(child);
+ /*
+ * If no parent, move charges to root cgroup.
+ */
+ if (!parent)
+ parent = root_mem_cgroup;
if (nr_pages > 1)
flags = compound_lock_irqsave(page);
- if (parent->use_hierarchy) {
- ret = mem_cgroup_move_account(page, nr_pages,
- pc, child, parent, false);
- if (!ret)
- __mem_cgroup_cancel_local_charge(child, nr_pages);
- } else {
- ret = mem_cgroup_move_account(page, nr_pages,
- pc, child, parent, true);
-
- if (ret)
- __mem_cgroup_cancel_charge(parent, nr_pages);
- }
+ ret = mem_cgroup_move_account(page, nr_pages,
+ pc, child, parent, false);
+ if (!ret)
+ __mem_cgroup_cancel_local_charge(child, nr_pages);
if (nr_pages > 1)
compound_unlock_irqrestore(page, flags);
-put_back:
putback_lru_page(page);
put:
put_page(page);