From: Jérôme Glisse <[email protected]> Fix for 4.14, zone device page always have an elevated refcount of one and thus page count sanity check in uncharge_page() is inappropriate for them.
Signed-off-by: Jérôme Glisse <[email protected]> Reported-by: Evgeny Baskakov <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Vladimir Davydov <[email protected]> --- mm/memcontrol.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 15af3da5af02..d51d3e1f49c9 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5648,7 +5648,8 @@ static void uncharge_batch(const struct uncharge_gather *ug) static void uncharge_page(struct page *page, struct uncharge_gather *ug) { VM_BUG_ON_PAGE(PageLRU(page), page); - VM_BUG_ON_PAGE(!PageHWPoison(page) && page_count(page), page); + VM_BUG_ON_PAGE(!PageHWPoison(page) && !is_zone_device_page(page) && + page_count(page), page); if (!page->mem_cgroup) return; -- 2.13.5
