linux-kernel - [PATCH 7/9] mm: add helper ensure_zone_is

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Message-Id: <1358463181-17956-8-git-send-email-cody@linux.vnet.ibm.com>
Date:	Thu, 17 Jan 2013 14:52:59 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>,
	David Hansen <dave@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Cody P Schafer <jmesmon@...il.com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 7/9] mm: add helper ensure_zone_is_initialized()

From: Cody P Schafer <jmesmon@...il.com>

ensure_zone_is_initialized() checks if a zone is in a empty & not
initialized state (typically occuring after it is created in memory
hotplugging), and, if so, calls init_currently_empty_zone() to
initialize the zone.

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

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c62bcca..bede456 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -253,6 +253,17 @@ static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
 		set_page_links(pfn_to_page(pfn), zid, nid, pfn);
 }
 
+/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
+ * alloc_bootmem_node_nopanic() */
+static int __ref ensure_zone_is_initialized(struct zone *zone,
+			unsigned long start_pfn, unsigned long num_pages)
+{
+	if (!zone_is_initialized(zone))
+		return init_currently_empty_zone(zone, start_pfn, num_pages,
+						 MEMMAP_HOTPLUG);
+	return 0;
+}
+
 static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
 		unsigned long start_pfn, unsigned long end_pfn)
 {
-- 
1.8.0.3

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