[PATCH 5/5] lumpy: only check for valid pages when holes are present

[Andy Whitcroft]

We only need to check that each page is valid with pfn_valid when
we are on an architecture which had holes within zones.  Make this
check conditional.

Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
---
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bef7e92..f249ad7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -725,9 +725,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 			/* The target page is in the block, ignore it. */
 			if (unlikely(pfn == page_pfn))
 				continue;
+#ifdef CONFIG_HOLES_IN_ZONE
 			/* Avoid holes within the zone. */
 			if (unlikely(!pfn_valid(pfn)))
 				break;
+#endif
 
 			cursor_page = pfn_to_page(pfn);
 			/* Check that we have not crossed a zone boundary. */
-
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