[PATCH] mm: cma: skip watermarks check for already isolated blocks in split_free_page() fix

[Marek Szyprowski <m.szyprowski@samsung.com>]

Cleanup and simplify the code which uses page migrate type.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 mm/page_alloc.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b990cb..f05365f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1393,12 +1393,15 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
 
 	zone = page_zone(page);
 	order = page_order(page);
+	mt = get_pageblock_migratetype(page);
 
-	if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) {
+	if (mt != MIGRATE_ISOLATE) {
 		/* Obey watermarks as if the page was being allocated */
 		watermark = low_wmark_pages(zone) + (1 << order);
 		if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
 			return 0;
+
+		__mod_zone_freepage_state(zone, -(1UL << order), mt);
 	}
 
 	/* Remove page from free list */
@@ -1406,10 +1409,6 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
 	zone->free_area[order].nr_free--;
 	rmv_page_order(page);
 
-	mt = get_pageblock_migratetype(page);
-	if (unlikely(mt != MIGRATE_ISOLATE))
-		__mod_zone_freepage_state(zone, -(1UL << order), mt);
-
 	if (alloc_order != order)
 		expand(zone, page, alloc_order, order,
 			&zone->free_area[order], migratetype);
-- 
1.7.9.5

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