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mm/gup: Use huge_ptep_get() in gup_hugepte() 

gup_hugepte() reads hugepage table entries, it can't read
them directly, huge_ptep_get() must be used.

Fixes: 9e343b467c ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ffc3714334c3bfaca6f13788ad039e8759ae413f.1592225558.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-06-15 12:57:57 +00:00 committed by Michael Ellerman
parent 1497eea686
commit 55ca22633a
1 changed files with 1 additions and 1 deletions
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mm/gup.c
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@ -2425,7 +2425,7 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
if (pte_end < end) if (pte_end < end)
end = pte_end; end = pte_end;
pte = READ_ONCE(*ptep); pte = huge_ptep_get(ptep);
if (!pte_access_permitted(pte, flags & FOLL_WRITE)) if (!pte_access_permitted(pte, flags & FOLL_WRITE))
return 0; return 0;