[PATCH v1] arm64/mm: use GENMASK_ULL for TTBR_BADDR_MASK_52

[Joey Gouly]

The comment says this should be GENMASK_ULL(47, 12), so do that!

GENMASK_ULL() is available in assembly since:
    95b980d62d52 ("linux/bits.h: make BIT(), GENMASK(), and friends available in assembly")

Signed-off-by: Joey Gouly <joey.gouly at arm.com>
Link: https://lore.kernel.org/all/20171221164851.edxq536yobjuagwe@armageddon.cambridge.arm.com/
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Kristina Martsenko <kristina.martsenko at arm.com>
---
 arch/arm64/include/asm/pgtable-hwdef.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index dd3d12bce07b..5ab8d163198f 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -281,10 +281,9 @@
  */
 #ifdef CONFIG_ARM64_PA_BITS_52
 /*
- * This should be GENMASK_ULL(47, 2).
  * TTBR_ELx[1] is RES0 in this configuration.
  */
-#define TTBR_BADDR_MASK_52	(((UL(1) << 46) - 1) << 2)
+#define TTBR_BADDR_MASK_52	GENMASK_ULL(47, 2)
 #endif
 
 #ifdef CONFIG_ARM64_VA_BITS_52
-- 
2.17.1