linux-kernel - [PATCH 3/5] memory-hotplug: ia64: suitable memory should go to ZONE

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Message-ID: <1405670163-53747-4-git-send-email-wangnan0@huawei.com>
Date:	Fri, 18 Jul 2014 15:56:01 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Ingo Molnar <mingo@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	"Mel Gorman" <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pei Feiyue <peifeiyue@...wei.com>, <linux-mm@...ck.org>,
	<x86@...nel.org>, <linux-ia64@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-sh@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 3/5] memory-hotplug: ia64: suitable memory should go to ZONE_MOVABLE

This patch add new memory to ZONE_MOVABLE if movable zone is setup
and lower than newly added memory for ia64.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 arch/ia64/mm/init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 25c3502..d81c916 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -625,6 +625,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
 {
 	pg_data_t *pgdat;
 	struct zone *zone;
+	struct zone *movable_zone;
 	unsigned long start_pfn = start >> PAGE_SHIFT;
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 	int ret;
@@ -632,6 +633,12 @@ int arch_add_memory(int nid, u64 start, u64 size)
 	pgdat = NODE_DATA(nid);
 
 	zone = pgdat->node_zones + ZONE_NORMAL;
+	movable_zone = pgdat->node_zones + ZONE_MOVABLE;
+	if (!zone_is_empty(movable_zone))
+		if (zone_spans_pfn(movable_zone, start_pfn) ||
+				(zone_end_pfn(movable_zone) <= start_pfn))
+			zone = movable_zone;
+
 	ret = __add_pages(nid, zone, start_pfn, nr_pages);
 
 	if (ret)
-- 
1.8.4

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