[PATCH] mm/page_isolate: change the prototype of undo_isolate_page_range()

[Pingfan Liu <kernelfans@xxxxxxxxx>]

undo_isolate_page_range() never fails, so no need to return value.

Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 include/linux/page-isolation.h | 2 +-
 mm/page_isolation.c            | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 280ae96..1099c2f 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -50,7 +50,7 @@ start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
  * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
  * target range is [start_pfn, end_pfn)
  */
-int
+void
 undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			unsigned migratetype);
 
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index e3638a5..89c19c0 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -230,7 +230,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 /*
  * Make isolated pages available again.
  */
-int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			    unsigned migratetype)
 {
 	unsigned long pfn;
@@ -247,7 +247,6 @@ int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			continue;
 		unset_migratetype_isolate(page, migratetype);
 	}
-	return 0;
 }
 /*
  * Test all pages in the range is free(means isolated) or not.
-- 
2.7.5