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| author | Yu Zhao <yuzhao@google.com> | 2019-02-12 15:35:58 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 14:35:12 +0100 |
| commit | 538162d21ac877b060dc057c89f13718f5caffc5 (patch) | |
| tree | 9202915a0c6f6f0276d3ef3db37393a1e0322772 /mm | |
| parent | fc4b12f3cad776dff7d56d9f08a96589859feac5 (diff) | |
| download | linux-stable-538162d21ac877b060dc057c89f13718f5caffc5.tar.gz linux-stable-538162d21ac877b060dc057c89f13718f5caffc5.tar.bz2 linux-stable-538162d21ac877b060dc057c89f13718f5caffc5.zip | |
mm/gup: fix gup_pmd_range() for dax
[ Upstream commit 414fd080d125408cb15d04ff4907e1dd8145c8c7 ]
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@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Keith Busch <keith.busch@intel.com>
Cc: "Michael S . Tsirkin" <mst@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/gup.c | 3 |
1 files changed, 2 insertions, 1 deletions
@@ -1643,7 +1643,8 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, 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 |