[PATCH 7/9] mm: add helper ensure_zone_is_initialized()

[Cody P Schafer <cody@linux.vnet.ibm.com>]

From: Cody P Schafer <jmesmon@gmail.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@linux.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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