memory-hotplug: fix comments in zone_spanned_pages_in_node() and zone_spanned_pages_i...

When hot adding a node from add_memory(), we will add memblock first, so
the node is not empty.  But when called from cpu_up(), the node should
be empty.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Taku Izumi <izumi.taku@jp.fujitsu.com>\
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5e8e99dd595a57b2b0cf5f49a051cf1de8f5f39f..b0fda2b9ca76bcf9ad06924f55da09e2fc849922 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5085,7 +5085,7 @@ 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 */
+       /* When hotadd a new node from cpu_up(), the node should be empty */
        if (!node_start_pfn && !node_end_pfn)
                return 0;
 
@@ -5152,7 +5152,7 @@ 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 */
+       /* When hotadd a new node from cpu_up(), the node should be empty */
        if (!node_start_pfn && !node_end_pfn)
                return 0;