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mm: add helper ensure_zone_is_initialized()
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> Cc: David Hansen <dave@linux.vnet.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -282,6 +282,17 @@ static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
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set_page_links(pfn_to_page(pfn), zid, nid, pfn);
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}
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/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
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* alloc_bootmem_node_nopanic() */
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static int __ref ensure_zone_is_initialized(struct zone *zone,
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unsigned long start_pfn, unsigned long num_pages)
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{
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if (!zone_is_initialized(zone))
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return init_currently_empty_zone(zone, start_pfn, num_pages,
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MEMMAP_HOTPLUG);
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return 0;
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}
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static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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