[PATCH] kernel/memremap.c: use ALIGN/ALIGN_DOWN to calculate align_start/end

[Wei Yang]

The purpose of align_start/end is to expand to SECTION boundary. Use
ALIGN/ALIGN_DOWN directly is more self-explain and clean.

Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
---
 kernel/memremap.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/memremap.c b/kernel/memremap.c
index 1490e63f69a9..53cf751f0721 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -159,10 +159,9 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
 	if (!pgmap->ref || !pgmap->kill)
 		return ERR_PTR(-EINVAL);
 
-	align_start = res->start & ~(SECTION_SIZE - 1);
-	align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
-		- align_start;
-	align_end = align_start + align_size - 1;
+	align_start = ALIGN_DOWN(res->start, SECTION_SIZE);
+	align_end = ALIGN(res->end, SECTION_SIZE) - 1;
+	align_size = align_end - align_start + 1;
 
 	conflict_pgmap = get_dev_pagemap(PHYS_PFN(align_start), NULL);
 	if (conflict_pgmap) {
-- 
2.19.1