Commit 17408d78 authored Jul 26, 2016 by Li RongQing Committed by Linus Torvalds Jul 26, 2016

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 0a31bc97 ("mm: memcontrol: rewrite
uncharge API").

[mhocko@suse.com: changelog enhancements]
Link: http://lkml.kernel.org/r/1465369248-13865-1-git-send-email-roy.qing.li@gmail.com


Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent dd4123f3

mm/memcontrol.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -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))

Admin message