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

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Date:	Fri, 18 Jul 2014 15:56:03 +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 5/5] memory-hotplug: powerpc: 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 powerpc.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 arch/powerpc/mm/mem.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 2c8e90f..2d869ef 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -118,6 +118,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
 {
 	struct pglist_data *pgdata;
 	struct zone *zone;
+	struct zone *movable_zone;
 	unsigned long start_pfn = start >> PAGE_SHIFT;
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 
@@ -129,6 +130,11 @@ int arch_add_memory(int nid, u64 start, u64 size)
 
 	/* this should work for most non-highmem platforms */
 	zone = pgdata->node_zones;
+	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;
 
 	return __add_pages(nid, zone, start_pfn, nr_pages);
 }
-- 
1.8.4

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