[PATCH] ARM: mm: fix size rounding-down of arm_add_memory()

[Masahiro Yamada]

The current rounding of "size" is wrong.

    size -= start & ~PAGE_MASK;

should be

    size -= PAGE_SIZE - (start & ~PAGE_MASK);

Or more simply

    size -= aligned_start - start;

Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
---
 arch/arm/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 50e198c..84508c0 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -641,8 +641,8 @@ int __init arm_add_memory(u64 start, u64 size)
 	 * Ensure that start/size are aligned to a page boundary.
 	 * Size is appropriately rounded down, start is rounded up.
 	 */
-	size -= start & ~PAGE_MASK;
 	aligned_start = PAGE_ALIGN(start);
+	size -= aligned_start - start;
 
 #ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT
 	if (aligned_start > ULONG_MAX) {
-- 
1.9.1