The patch titled
Subject: mm/memcg: avoid page count check for zone device
has been added to the -mm tree. Its filename is
mm-memcg-avoid-page-count-check-for-zone-device.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-avoid-page-count-check-for-zone-device.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-avoid-page-count-check-for-zone-device.patch
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------------------------------------------------------
From: Jérôme Glisse <jglisse@xxxxxxxxxx>
Subject: mm/memcg: avoid page count check for zone device
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.
Link: http://lkml.kernel.org/r/20170914190011.5217-1-jglisse@xxxxxxxxxx
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
Reported-by: Evgeny Baskakov <ebaskakov@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/memcontrol.c~mm-memcg-avoid-page-count-check-for-zone-device mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcg-avoid-page-count-check-for-zone-device
+++ a/mm/memcontrol.c
@@ -5658,7 +5658,8 @@ static void uncharge_batch(const struct
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;
_
Patches currently in -mm which might be from jglisse@xxxxxxxxxx are
mm-memcg-avoid-page-count-check-for-zone-device.patch
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