Merge tag 'disintegrate-mtd-20121009' of git://git.infradead.org/users/dhowells/linux-headers

UAPI Disintegration 2012-10-09

Conflicts:
	MAINTAINERS
	arch/arm/configs/bcmring_defconfig
	arch/arm/mach-imx/clk-imx51-imx53.c
	drivers/mtd/nand/Kconfig
	drivers/mtd/nand/bcm_umi_nand.c
	drivers/mtd/nand/nand_bcm_umi.h
	drivers/mtd/nand/orion_nand.c

1 files changed, 38 insertions, 5 deletions

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 247d1f175739..f2f5b4818e94 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -76,8 +76,13 @@ int set_migratetype_isolate(struct page *page)
 
 out:
 	if (!ret) {
+		unsigned long nr_pages;
+		int migratetype = get_pageblock_migratetype(page);
+
 		set_pageblock_isolate(page);
-		move_freepages_block(zone, page, MIGRATE_ISOLATE);
+		nr_pages = move_freepages_block(zone, page, MIGRATE_ISOLATE);
+
+		__mod_zone_freepage_state(zone, -nr_pages, migratetype);
 	}
 
 	spin_unlock_irqrestore(&zone->lock, flags);
@@ -89,12 +94,14 @@ out:
 void unset_migratetype_isolate(struct page *page, unsigned migratetype)
 {
 	struct zone *zone;
-	unsigned long flags;
+	unsigned long flags, nr_pages;
+
 	zone = page_zone(page);
 	spin_lock_irqsave(&zone->lock, flags);
 	if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
 		goto out;
-	move_freepages_block(zone, page, migratetype);
+	nr_pages = move_freepages_block(zone, page, migratetype);
+	__mod_zone_freepage_state(zone, nr_pages, migratetype);
 	restore_pageblock_isolate(page, migratetype);
 out:
 	spin_unlock_irqrestore(&zone->lock, flags);
@@ -193,10 +200,25 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn)
 			continue;
 		}
 		page = pfn_to_page(pfn);
-		if (PageBuddy(page))
+		if (PageBuddy(page)) {
+			/*
+			 * If race between isolatation and allocation happens,
+			 * some free pages could be in MIGRATE_MOVABLE list
+			 * although pageblock's migratation type of the page
+			 * is MIGRATE_ISOLATE. Catch it and move the page into
+			 * MIGRATE_ISOLATE list.
+			 */
+			if (get_freepage_migratetype(page) != MIGRATE_ISOLATE) {
+				struct page *end_page;
+
+				end_page = page + (1 << page_order(page)) - 1;
+				move_freepages(page_zone(page), page, end_page,
+						MIGRATE_ISOLATE);
+			}
 			pfn += 1 << page_order(page);
+		}
 		else if (page_count(page) == 0 &&
-				page_private(page) == MIGRATE_ISOLATE)
+			get_freepage_migratetype(page) == MIGRATE_ISOLATE)
 			pfn += 1;
 		else
 			break;
@@ -233,3 +255,14 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
 	spin_unlock_irqrestore(&zone->lock, flags);
 	return ret ? 0 : -EBUSY;
 }
+
+struct page *alloc_migrate_target(struct page *page, unsigned long private,
+				  int **resultp)
+{
+	gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
+
+	if (PageHighMem(page))
+		gfp_mask |= __GFP_HIGHMEM;
+
+	return alloc_page(gfp_mask);
+}