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 <[email protected]>
Signed-off-by: Marek Szyprowski <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Tested-by: Robert Nelson <[email protected]>
Tested-by: Barry Song <[email protected]>

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;