patches.dma-mapping/mm-compaction-introduce-map_pages.patch

From dhobsong@igel.co.jp Mon Oct 29 00:51:53 2012
From: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Date: Mon, 29 Oct 2012 16:50:20 +0900
Subject: [PATCH v2 03/58] mm: compaction: introduce map_pages()
To: greg@kroah.com, laurent.pinchart@ideasonboard.com, horms@verge.net.au
Cc: ltsi-dev@lists.linuxfoundation.org, dhobsong@igel.co.jp
Message-ID: <1351497075-32717-4-git-send-email-dhobsong@igel.co.jp>


From: Michal Nazarewicz <mina86@mina86.com>

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>
(cherry picked from commit 03d44192f69a45d780ba124f691e76020a44ebae)

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 mm/compaction.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 0304ff6..f740488 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;
-- 
1.7.5.4