memory-hotplug: fix wrong edge when hot add a new node

When we add a new node, the edge of memory may be wrong.

e.g. system has 4 nodes, and node3 is movable, node3 mem:[24G-32G],

1. hotremove the node3,
2. then hotadd node3 with a part of memory, mem:[26G-30G],
3. call hotadd_new_pgdat()
        free_area_init_node()
                get_pfn_range_for_nid()
4. it will return wrong start_pfn and end_pfn, because we have not
update the memblock.

This patch also fixes a BUG_ON during hot-addition, please see
http://marc.info/?l=linux-kernel&m=142961156129456&w=2

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 11 insertions, 0 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 003dbe4b060d..6da82bcb0a8b 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1277,6 +1277,7 @@ int __ref add_memory(int nid, u64 start, u64 size)
 
         /* create new memmap entry */
         firmware_map_add_hotplug(start, start + size, "System RAM");
+        memblock_add_node(start, size, nid);
 
         goto out;
 
@@ -2013,6 +2014,8 @@ void __ref remove_memory(int nid, u64 start, u64 size)
 
         /* remove memmap entry */
         firmware_map_remove(start, start + size, "System RAM");
+        memblock_free(start, size);
+        memblock_remove(start, size);
 
         arch_remove_memory(start, size);
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index beda41710802..df959b7d6085 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5060,6 +5060,10 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
 {
         unsigned long zone_start_pfn, zone_end_pfn;
 
+        /* When hotadd a new node, the node should be empty */
+        if (!node_start_pfn && !node_end_pfn)
+                return 0;
+
         /* Get the start and end of the zone */
         zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
         zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
@@ -5123,6 +5127,10 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
         unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
         unsigned long zone_start_pfn, zone_end_pfn;
 
+        /* When hotadd a new node, the node should be empty */
+        if (!node_start_pfn && !node_end_pfn)
+                return 0;
+
         zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
         zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);