mm/gup: fix gup_pmd_range() for dax
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Message ID 20190111034033.601-1-yuzhao@google.com
State New
Headers show
Series
  • mm/gup: fix gup_pmd_range() for dax
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Commit Message

Yu Zhao Jan. 11, 2019, 3:40 a.m. UTC
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.

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
 mm/gup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch
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diff --git a/mm/gup.c b/mm/gup.c
index 05acd7e2eb22..75029649baca 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1674,7 +1674,8 @@  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