[PATCH 07/12] mm: compaction: use helper compound_nr in isolate_migratepages_block

[Miaohe Lin <linmiaohe@xxxxxxxxxx>]

Use helper compound_nr to make use of compound_nr when CONFIG_64BIT and
simplify the code a bit.

Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
 mm/compaction.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 1fc912ec3a98..55013a2af817 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -908,7 +908,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 				 /* Do not report -EBUSY down the chain */
 				if (ret == -EBUSY)
 					ret = 0;
-				low_pfn += (1UL << compound_order(page)) - 1;
+				low_pfn += compound_nr(page) - 1;
 				goto isolate_fail;
 			}
 
-- 
2.23.0