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-rw-r--r--mm/memcontrol.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 93cb16d..a63ad14 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1960,7 +1960,7 @@ void mem_cgroup_update_page_stat(struct page *page,
bool need_unlock = false;
unsigned long uninitialized_var(flags);
- if (unlikely(!pc))
+ if (mem_cgroup_disabled())
return;
rcu_read_lock();
@@ -2735,8 +2735,6 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
}
pc = lookup_page_cgroup(page);
- BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */
-
ret = __mem_cgroup_try_charge(mm, gfp_mask, nr_pages, &memcg, oom);
if (ret || !memcg)
return ret;
@@ -3008,7 +3006,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
* Check if our page_cgroup is valid
*/
pc = lookup_page_cgroup(page);
- if (unlikely(!pc || !PageCgroupUsed(pc)))
+ if (unlikely(!PageCgroupUsed(pc)))
return NULL;
lock_page_cgroup(pc);
@@ -3436,6 +3434,11 @@ static struct page_cgroup *lookup_page_cgroup_used(struct page *page)
struct page_cgroup *pc;
pc = lookup_page_cgroup(page);
+ /*
+ * Can be NULL while feeding pages into the page allocator for
+ * the first time, i.e. during boot or memory hotplug;
+ * or when mem_cgroup_disabled().
+ */
if (likely(pc) && PageCgroupUsed(pc))
return pc;
return NULL;
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