[PATCH] mm/ZONE_DEVICE: Keep ZONE_DEVICE out of allocation zonelist.

[JÃrÃme Glisse]

Memory inside a ZONE_DEVICE should never be consider by the buddy
allocator and thus any such zone should never be added to any of
the zonelist. This patch just do that.

Signed-off-by: Jéme Glisse <jglisse@xxxxxxxxxx>
---
 mm/page_alloc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ef19f22..f3e26de 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3834,6 +3834,13 @@ static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist,
 	do {
 		zone_type--;
 		zone = pgdat->node_zones + zone_type;
+		/*
+		 * Device zone is special memory and should never be consider
+		 * for regular allocation. It is expected that page in device
+		 * zone will be allocated by other means.
+		 */
+		if (is_dev_zone(zone))
+			continue;
 		if (populated_zone(zone)) {
 			zoneref_set_zone(zone,
 				&zonelist->_zonerefs[nr_zones++]);
-- 
1.8.3.1


--17pEHd4RhPHOinZp--
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