linux-kernel - [PATCH] memory-hotplug: fix comment in zone_spanned_pages_in_node() and zone_spanned_pages_in

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Date:	Tue, 25 Aug 2015 10:03:14 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	<mgorman@...hsingularity.net>,
	David Rientjes <rientjes@...gle.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	<izumi.taku@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>
Subject: [PATCH] memory-hotplug: fix comment in zone_spanned_pages_in_node()
 and zone_spanned_pages_in_node()

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

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/page_alloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2ec3ca3..d370445 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5051,7 +5051,7 @@ 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;
 
@@ -5118,7 +5118,7 @@ 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;
 
-- 
2.0.0


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