linux-kernel - [PATCH v2 5/6] mm: Introduce for_each_zone

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Date:   Mon, 26 Aug 2019 12:10:11 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Arun KS <arunks@...eaurora.org>
Subject: [PATCH v2 5/6] mm: Introduce for_each_zone_nid()

Allow to iterate all zones belonging to a nid.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Wei Yang <richard.weiyang@...il.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Arun KS <arunks@...eaurora.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/mmzone.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8b5f758942a2..71f2b9b55069 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1004,6 +1004,11 @@ extern struct zone *next_zone(struct zone *zone);
 			; /* do nothing */		\
 		else
 
+#define for_each_zone_nid(zone, nid)			\
+	for (zone = (NODE_DATA(nid))->node_zones;	\
+	     zone && zone_to_nid(zone) == nid;		\
+	     zone = next_zone(zone))
+
 static inline struct zone *zonelist_zone(struct zoneref *zoneref)
 {
 	return zoneref->zone;
-- 
2.21.0