linux-kernel - [PATCH 14/17] mm/memory_hotplug: factor out zone+pgdat growth.

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Message-Id: <1358295894-24167-15-git-send-email-cody@linux.vnet.ibm.com>
Date:	Tue, 15 Jan 2013 16:24:51 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 14/17] mm/memory_hotplug: factor out zone+pgdat growth.

Create a new function grow_pgdat_and_zone() which handles locking +
growth of a zone & the pgdat which it is associated with.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 mm/memory_hotplug.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0a74b86a..c6149a3 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -361,6 +361,16 @@ static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
 					pgdat->node_start_pfn;
 }
 
+static void grow_pgdat_and_zone(struct zone *zone, unsigned long start_pfn,
+		unsigned long end_pfn)
+{
+	unsigned long flags;
+	pgdat_resize_lock(zone->zone_pgdat, &flags);
+	grow_zone_span(zone, start_pfn, end_pfn);
+	grow_pgdat_span(zone->zone_pgdat, start_pfn, end_pfn);
+	pgdat_resize_unlock(zone->zone_pgdat, &flags);
+}
+
 static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
 {
 	struct pglist_data *pgdat = zone->zone_pgdat;
@@ -375,11 +385,7 @@ static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
 	if (ret)
 		return ret;
 
-	pgdat_resize_lock(zone->zone_pgdat, &flags);
-	grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
-	grow_pgdat_span(zone->zone_pgdat, phys_start_pfn,
-			phys_start_pfn + nr_pages);
-	pgdat_resize_unlock(zone->zone_pgdat, &flags);
+	grow_pgdat_and_zone(zone, phys_start_pfn, phys_start_pfn + nr_pages);
 	memmap_init_zone(nr_pages, nid, zone_type,
 			 phys_start_pfn, MEMMAP_HOTPLUG);
 	return 0;
-- 
1.8.0.3

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