From: Li RongQing <roy.qing.li@xxxxxxxxx>
Subject: 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").
[mhocko@xxxxxxxx: changelog enhancements]
Link: http://lkml.kernel.org/r/1465369248-13865-1-git-send-email-roy.qing.li@xxxxxxxxx
Signed-off-by: Li RongQing <roy.qing.li@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 1 -
1 file changed, 1 deletion(-)
diff -puN mm/memcontrol.c~mm-memcontrol-remove-bug_on-in-uncharge_list mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-remove-bug_on-in-uncharge_list
+++ a/mm/memcontrol.c
@@ -5580,7 +5580,6 @@ static void uncharge_list(struct list_he
if (PageTransHuge(page)) {
nr_pages <<= compound_order(page);
- VM_BUG_ON_PAGE(!PageTransHuge(page), page);
nr_huge += nr_pages;
}
if (PageAnon(page))
_
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