The patch titled
Subject: mm/gup: fix gup_pmd_range() for dax
has been added to the -mm tree. Its filename is
mm-gup-fix-gup_pmd_range-for-dax.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-gup-fix-gup_pmd_range-for-dax.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-gup-fix-gup_pmd_range-for-dax.patch
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: mm/gup: fix gup_pmd_range() for dax
For dax pmd, pmd_trans_huge() returns false but pmd_huge() returns true on
x86. So the function works as long as hugetlb is configured. However,
dax doesn't depend on hugetlb.
Link: http://lkml.kernel.org/r/20190111034033.601-1-yuzhao@xxxxxxxxxx
Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: "Michael S . Tsirkin" <mst@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/gup.c~mm-gup-fix-gup_pmd_range-for-dax
+++ a/mm/gup.c
@@ -1826,7 +1826,8 @@ static int gup_pmd_range(pud_t pud, unsi
if (!pmd_present(pmd))
return 0;
- if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd))) {
+ if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd) ||
+ pmd_devmap(pmd))) {
/*
* NUMA hinting faults need to be handled in the GUP
* slowpath for accounting purposes and so that they
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-gup-fix-gup_pmd_range-for-dax.patch
mm-dont-expose-page-to-fast-gup-before-its-ready.patch
