| Message ID | 769fe7c1a4d3a4165943b1a0c1443be3508d224c.1496921366.git.robin.murphy@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c index 8d6ca28c3e1f..a490db032c51 100644 --- a/drivers/iommu/io-pgtable-arm-v7s.c +++ b/drivers/iommu/io-pgtable-arm-v7s.c @@ -92,7 +92,8 @@ #define ARM_V7S_PTE_TYPE_CONT_PAGE 0x1 #define ARM_V7S_PTE_IS_VALID(pte) (((pte) & 0x3) != 0) -#define ARM_V7S_PTE_IS_TABLE(pte, lvl) (lvl == 1 && ((pte) & ARM_V7S_PTE_TYPE_TABLE)) +#define ARM_V7S_PTE_IS_TABLE(pte, lvl) \ + ((lvl) == 1 && (((pte) & 0x3) == ARM_V7S_PTE_TYPE_TABLE)) /* Page table bits */ #define ARM_V7S_ATTR_XN(lvl) BIT(4 * (2 - (lvl)))
Whilst we don't support the PXN bit at all, so should never encounter a level 1 section or supersection PTE with it set, it would still be wise to check both table type bits to resolve any theoretical ambiguity. Signed-off-by: Robin Murphy <robin.murphy@arm.com> --- drivers/iommu/io-pgtable-arm-v7s.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)