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-rw-r--r--mm/memcontrol.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 96cd9ebefb2c..37bae5571a47 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2592,23 +2592,19 @@ void mem_cgroup_split_huge_fixup(struct page *head)
* @pc: page_cgroup of the page.
* @from: mem_cgroup which the page is moved from.
* @to: mem_cgroup which the page is moved to. @from != @to.
- * @uncharge: whether we should call uncharge and css_put against @from.
*
* The caller must confirm following.
* - page is not on LRU (isolate_page() is useful.)
* - compound_lock is held when nr_pages > 1
*
- * This function doesn't do "charge" nor css_get to new cgroup. It should be
- * done by a caller(__mem_cgroup_try_charge would be useful). If @uncharge is
- * true, this function does "uncharge" from old cgroup, but it doesn't if
- * @uncharge is false, so a caller should do "uncharge".
+ * This function doesn't do "charge" to new cgroup and doesn't do "uncharge"
+ * from old cgroup.
*/
static int mem_cgroup_move_account(struct page *page,
unsigned int nr_pages,
struct page_cgroup *pc,
struct mem_cgroup *from,
- struct mem_cgroup *to,
- bool uncharge)
+ struct mem_cgroup *to)
{
unsigned long flags;
int ret;
@@ -2642,9 +2638,6 @@ static int mem_cgroup_move_account(struct page *page,
preempt_enable();
}
mem_cgroup_charge_statistics(from, anon, -nr_pages);
- if (uncharge)
- /* This is not "cancel", but cancel_charge does all we need. */
- __mem_cgroup_cancel_charge(from, nr_pages);
/* caller should have done css_get */
pc->mem_cgroup = to;
@@ -2706,7 +2699,7 @@ static int mem_cgroup_move_parent(struct page *page,
flags = compound_lock_irqsave(page);
ret = mem_cgroup_move_account(page, nr_pages,
- pc, child, parent, false);
+ pc, child, parent);
if (!ret)
__mem_cgroup_cancel_local_charge(child, nr_pages);
@@ -5474,8 +5467,7 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
if (!isolate_lru_page(page)) {
pc = lookup_page_cgroup(page);
if (!mem_cgroup_move_account(page, HPAGE_PMD_NR,
- pc, mc.from, mc.to,
- false)) {
+ pc, mc.from, mc.to)) {
mc.precharge -= HPAGE_PMD_NR;
mc.moved_charge += HPAGE_PMD_NR;
}
@@ -5505,7 +5497,7 @@ retry:
goto put;
pc = lookup_page_cgroup(page);
if (!mem_cgroup_move_account(page, 1, pc,
- mc.from, mc.to, false)) {
+ mc.from, mc.to)) {
mc.precharge--;
/* we uncharge from mc.from later. */
mc.moved_charge++;