mm: move page->mem_cgroup bad page handling into generic code

Now that the external page_cgroup data structure and its lookup is
gone, let the generic bad_page() check for page->mem_cgroup sanity.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Tejun Heo <tj@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 22cfdeffbf69..a7198c065999 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -640,8 +640,10 @@ static inline int free_pages_check(struct page *page)
                 bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
                 bad_flags = PAGE_FLAGS_CHECK_AT_FREE;
         }
-        if (unlikely(mem_cgroup_bad_page_check(page)))
-                bad_reason = "cgroup check failed";
+#ifdef CONFIG_MEMCG
+        if (unlikely(page->mem_cgroup))
+                bad_reason = "page still charged to cgroup";
+#endif
         if (unlikely(bad_reason)) {
                 bad_page(page, bad_reason, bad_flags);
                 return 1;
@@ -900,8 +902,10 @@ static inline int check_new_page(struct page *page)
                 bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set";
                 bad_flags = PAGE_FLAGS_CHECK_AT_PREP;
         }
-        if (unlikely(mem_cgroup_bad_page_check(page)))
-                bad_reason = "cgroup check failed";
+#ifdef CONFIG_MEMCG
+        if (unlikely(page->mem_cgroup))
+                bad_reason = "page still charged to cgroup";
+#endif
         if (unlikely(bad_reason)) {
                 bad_page(page, bad_reason, bad_flags);
                 return 1;