Messages in this thread Patch in this message | | | From | jglisse@redhat ... | Subject | [PATCH] mm/memcg: avoid page count check for zone device | Date | Thu, 14 Sep 2017 15:00:11 -0400 |
| |
From: Jérôme Glisse <jglisse@redhat.com>
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 <jglisse@redhat.com> Reported-by: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> --- 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
| |