[PATCH] Use ZVC for free_pages

This is again simplifies some of the VM counter calculations through the use
of the ZVC consolidated counters.

[michal.k.k.piotrowski@gmail.com: build fix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index c024606..fc53ad0 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -591,7 +591,7 @@
 
 	for_each_zone(zone)
 		if (populated_zone(zone) && is_highmem(zone))
-			cnt += zone->free_pages;
+			cnt += zone_page_state(zone, NR_FREE_PAGES);
 
 	return cnt;
 }
@@ -869,7 +869,7 @@
 	for_each_zone(zone) {
 		meta += snapshot_additional_pages(zone);
 		if (!is_highmem(zone))
-			free += zone->free_pages;
+			free += zone_page_state(zone, NR_FREE_PAGES);
 	}
 
 	nr_pages += count_pages_for_highmem(nr_highmem);