[RFC PATCH v3 06/31] mm: add nid_zone() helper

[Cody P Schafer]

Add nid_zone(), which returns the zone corresponding to a given nid & zonenum.

Signed-off-by: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
---
 include/linux/mm.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1a7f19e..2004713 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -711,9 +711,14 @@ static inline void page_nid_reset_last(struct page *page)
 }
 #endif
 
+static inline struct zone *nid_zone(int nid, enum zone_type zonenum)
+{
+	return &NODE_DATA(nid)->node_zones[zonenum];
+}
+
 static inline struct zone *page_zone(const struct page *page)
 {
-	return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
+	return nid_zone(page_to_nid(page), page_zonenum(page));
 }
 
 #ifdef SECTION_IN_PAGE_FLAGS
-- 
1.8.2.2

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