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| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-02-22 16:35:30 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:21 -0800 |
| commit | f6bbb78e5bcbe45cfb8ed0d7ecd1549f4eb46a30 (patch) | |
| tree | 5e98028f9df9eeb0ffe110ce61a98f97d2232d90 /mm/memory_hotplug.c | |
| parent | b5e6a5a2724bc9f0b121062ab730d48731ae83e3 (diff) | |
| download | lwn-f6bbb78e5bcbe45cfb8ed0d7ecd1549f4eb46a30.tar.gz lwn-f6bbb78e5bcbe45cfb8ed0d7ecd1549f4eb46a30.zip | |
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>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8b3235eedf3d..6e625f60dbcc 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -282,6 +282,17 @@ 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) { |