linux-kernel - [PATCH AUTOSEL 3.18 4/6] mm/gup: fix gup_pmd

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Message-Id: <20190311195951.139741-4-sashal@kernel.org>
Date:   Mon, 11 Mar 2019 15:59:49 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yu Zhao <yuzhao@...gle.com>,
        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>, linux-mm@...ck.org
Subject: [PATCH AUTOSEL 3.18 4/6] mm/gup: fix gup_pmd_range() for dax

From: Yu Zhao <yuzhao@...gle.com>

[ 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 ce1630bf0b95..29a36fae8624 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -885,7 +885,8 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
 		if (pmd_none(pmd) || pmd_trans_splitting(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