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Subject[PATCH 2/6] powerpc: fix usage of _PAGE_RO in hugepage
Date
fixes: a7b9f671f2d14 ("powerpc32: adds handling of _PAGE_RO")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 2 ++
arch/powerpc/mm/hugetlbpage.c | 2 ++
2 files changed, 4 insertions(+)

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 3f85d43..7873b09 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -6,6 +6,8 @@
*/
#define _PAGE_BIT_SWAP_TYPE 0

+#define _PAGE_RO 0
+
#define _PAGE_EXEC 0x00001 /* execute permission */
#define _PAGE_WRITE 0x00002 /* write access allowed */
#define _PAGE_READ 0x00004 /* read access allowed */
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 9164a77..03fcb7e 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -1019,6 +1019,8 @@ int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
mask = _PAGE_PRESENT | _PAGE_READ;
if (write)
mask |= _PAGE_WRITE;
+ else
+ mask |= _PAGE_RO;

if ((pte_val(pte) & mask) != mask)
return 0;
--
2.1.0
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