On Tue 30-05-17 14:37:24, Heiko Carstens wrote:

On Tue, May 30, 2017 at 02:18:06PM +0200, Michal Hocko wrote:

quoted

quoted

So ZONE_DMA ends within ZONE_NORMAL. This shouldn't be possible, unless
this restriction is gone?

The patch below should help.

It does fix this specific problem, but introduces a new one:

# echo online_movable > /sys/devices/system/memory/memory16/state
# cat /sys/devices/system/memory/memory16/valid_zones
Movable
# echo offline > /sys/devices/system/memory/memory16/state
# cat /sys/devices/system/memory/memory16/valid_zones
          <--- no output

Memory block 16 is the only one I onlined and offlineto ZONE_MOVABLE.

Could you test the this on top please?
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 792c098e0e5f..a26f9f8e6365 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c

@@ -937,13 +937,18 @@ void __ref move_pfn_range_to_zone(struct zone *zone,
 	set_zone_contiguous(zone);
 }
 
+/*
+ * Returns a default kernel memory zone for the given pfn range.
+ * If no kernel zone covers this pfn range it will automatically go
+ * to the ZONE_NORMAL.
+ */
 struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn,
 		unsigned long nr_pages)
 {
 	struct pglist_data *pgdat = NODE_DATA(nid);
 	int zid;
 
-	for (zid = 0; zid < MAX_NR_ZONES; zid++) {
+	for (zid = 0; zid <= ZONE_NORMAL; zid++) {
 		struct zone *zone = &pgdat->node_zones[zid];
 
 		if (zone_intersects(zone, start_pfn, nr_pages))

-- 
Michal Hocko
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>