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Date: Fri, 22 Mar 2019 12:13:29 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Yu Zhao <yuzhao@...gle.com>, Jan Kara <jack@...e.cz>, Dan Williams <dan.j.williams@...el.com>, Huang Ying <ying.huang@...el.com>, Matthew Wilcox <willy@...radead.org>, Keith Busch <keith.busch@...el.com>, "Michael S . Tsirkin" <mst@...hat.com>, John Hubbard <jhubbard@...dia.com>, Wei Yang <richard.weiyang@...il.com>, Mike Rapoport <rppt@...ux.ibm.com>, Andrea Arcangeli <aarcange@...hat.com>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 056/280] mm/gup: fix gup_pmd_range() for dax 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ 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@...gle.com> Reviewed-by: Jan Kara <jack@...e.cz> Cc: Dan Williams <dan.j.williams@...el.com> Cc: Huang Ying <ying.huang@...el.com> Cc: Matthew Wilcox <willy@...radead.org> Cc: Keith Busch <keith.busch@...el.com> Cc: "Michael S . Tsirkin" <mst@...hat.com> Cc: John Hubbard <jhubbard@...dia.com> Cc: Wei Yang <richard.weiyang@...il.com> Cc: Mike Rapoport <rppt@...ux.ibm.com> Cc: Andrea Arcangeli <aarcange@...hat.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- mm/gup.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index 1abc8b4afff6..0a5374e6e82d 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1649,7 +1649,8 @@ 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 -- 2.19.1
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