mm: memcontrol: remove BUG_ON in uncharge_list

When calling uncharge_list, if a page is transparent huge we don't need
to BUG_ON about non-transparent huge, since nobody should be able to see
the page at this stage and this page cannot be raced against with a THP
split.

This check became unneeded after 0a31bc97c80c ("mm: memcontrol: rewrite
uncharge API").

[[email protected]: changelog enhancements]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Li RongQing <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1a1a3093a5c9e8c6cb454b5234f36dd3e5c62c8f..36d6e324fadca04e19ddd97d9c8a79c9dc807e3d 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5580,7 +5580,6 @@ static void uncharge_list(struct list_head *page_list)
 
                        if (PageTransHuge(page)) {
                                nr_pages <<= compound_order(page);
-                               VM_BUG_ON_PAGE(!PageTransHuge(page), page);
                                nr_huge += nr_pages;
                        }
                        if (PageAnon(page))