mm: compaction: introduce map_pages()

This commit creates a map_pages() function which map pages freed
using split_free_pages().  This merely moves some code from
isolate_freepages() so that it can be reused in other places.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
Tested-by: Barry Song <Baohua.Song@csr.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index ee20fc044b91..d9d7b35d3933 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -127,6 +127,16 @@ static bool suitable_migration_target(struct page *page)
         return false;
 }
 
+static void map_pages(struct list_head *list)
+{
+        struct page *page;
+
+        list_for_each_entry(page, list, lru) {
+                arch_alloc_page(page, 0);
+                kernel_map_pages(page, 1, 1);
+        }
+}
+
 /*
  * Based on information in the current compact_control, find blocks
  * suitable for isolating free pages from and then isolate them.
@@ -206,10 +216,7 @@ static void isolate_freepages(struct zone *zone,
         }
 
         /* split_free_page does not map the pages */
-        list_for_each_entry(page, freelist, lru) {
-                arch_alloc_page(page, 0);
-                kernel_map_pages(page, 1, 1);
-        }
+        map_pages(freelist);
 
         cc->free_pfn = high_pfn;
         cc->nr_freepages = nr_freepages;