[PATCH 07/17] mm/page_alloc: use zone_spans_pfn() instead of open coding.

[Cody P Schafer]

Use zone_spans_pfn() instead of open coding pfn ownership checks.

This is split from following patch as could slightly degrade the
generated code. Pre-patch, the code uses it's knowledge that start_pfn <
end_pfn to cut down on the number of comparisons. Post-patch, the
compiler has to figure it out.

Signed-off-by: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
---
 mm/page_alloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index da5a5ec..3911c1a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -978,9 +978,9 @@ int move_freepages_block(struct zone *zone, struct page *page,
 	end_pfn = start_pfn + pageblock_nr_pages - 1;
 
 	/* Do not cross zone boundaries */
-	if (start_pfn < zone->zone_start_pfn)
+	if (!zone_spans_pfn(zone, start_pfn))
 		start_page = page;
-	if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages)
+	if (!zone_spans_pfn(zone, end_pfn))
 		return 0;
 
 	return move_freepages(zone, start_page, end_page, migratetype);
-- 
1.8.0.3

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