[PATCH] ARM: mmu_32: Fix zero page faulting

[PATCH] ARM: mmu_32: Fix zero page faulting

[Sascha Hauer]

Even with MAP_FAULT we still set PTE_TYPE_SMALL in the 2nd level page
table. With this the zero page doesn't fault on ARMv6 and earlier. Fix
this by only setting PTE_TYPE_SMALL when the map_type is not MAP_FAULT.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm/cpu/mmu_32.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c
index 14775768a3..a6cb3e04f4 100644
--- a/arch/arm/cpu/mmu_32.c
+++ b/arch/arm/cpu/mmu_32.c
@@ -266,7 +266,9 @@ static void __arch_remap_range(void *_virt_addr, phys_addr_t phys_addr, size_t s
 			 * replace it with a section
 			 */
 			chunk = PGDIR_SIZE;
-			*pgd = phys_addr | pmd_flags | PMD_TYPE_SECT;
+			*pgd = phys_addr | pmd_flags;
+			if (map_type != MAP_FAULT)
+				*pgd |= PMD_TYPE_SECT;
 			dma_flush_range(pgd, sizeof(*pgd));
 		} else {
 			unsigned int num_ptes;
@@ -306,7 +308,9 @@ static void __arch_remap_range(void *_virt_addr, phys_addr_t phys_addr, size_t s
 
 			for (i = 0; i < num_ptes; i++) {
 				pte[i] = phys_addr + i * PAGE_SIZE;
-				pte[i] |= pte_flags | PTE_TYPE_SMALL;
+				pte[i] |= pte_flags;
+				if (map_type != MAP_FAULT)
+					pte[i] |= PTE_TYPE_SMALL;
 			}
 
 			dma_flush_range(pte, num_ptes * sizeof(u32));
-- 
2.39.2