Messages in this thread Patch in this message | | | From | Christophe Leroy <> | Subject | [PATCH 1/3] mm/gup: Use huge_ptep_get() in gup_hugepte() | Date | Mon, 15 Jun 2020 12:57:57 +0000 (UTC) |
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gup_hugepte() reads hugepage table entries, it can't read them directly, huge_ptep_get() must be used.
Fixes: 2ab3a0a02905 ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses") Cc: Will Deacon <will@kernel.org> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/gup.c b/mm/gup.c index de9e36262ccb..761df4944ef5 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2425,7 +2425,7 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, if (pte_end < end) end = pte_end; - pte = READ_ONCE(*ptep); + pte = huge_ptep_get(ptep); if (!pte_access_permitted(pte, flags & FOLL_WRITE)) return 0; -- 2.25.0
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