mm/page_isolation: do some cleanup in "undo_isolate_page_range"

Use "IS_ALIGNED" to judge the alignment, rather than directly judging.

Signed-off-by: Wang Xiaoqiang <wang_xiaoq@126.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 5e139fec6c6c..92c4c36501e7 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -196,8 +196,10 @@ int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 {
         unsigned long pfn;
         struct page *page;
-        BUG_ON((start_pfn) & (pageblock_nr_pages - 1));
-        BUG_ON((end_pfn) & (pageblock_nr_pages - 1));
+
+        BUG_ON(!IS_ALIGNED(start_pfn, pageblock_nr_pages));
+        BUG_ON(!IS_ALIGNED(end_pfn, pageblock_nr_pages));
+
         for (pfn = start_pfn;
              pfn < end_pfn;
              pfn += pageblock_nr_pages) {