diff options
| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2013-07-03 15:02:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:29 -0700 |
| commit | d702909f0aa14fe678d74d7f974aa66bfb211d0b (patch) | |
| tree | 4c731abe0557a0749c38c14da77720f61544137a /mm | |
| parent | aa47228a18e6d49369df877463095b899aff495f (diff) | |
| download | lwn-d702909f0aa14fe678d74d7f974aa66bfb211d0b.tar.gz lwn-d702909f0aa14fe678d74d7f974aa66bfb211d0b.zip | |
memory_hotplug: use pgdat_resize_lock() in __offline_pages()
mmzone.h documents node_size_lock (which pgdat_resize_lock() locks) as
follows:
* Must be held any time you expect node_start_pfn, node_present_pages
* or node_spanned_pages stay constant. [...]
So actually hold it when we update node_present_pages in __offline_pages().
[akpm@linux-foundation.org: fix build]
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory_hotplug.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 527c51084bb8..a66d0023d219 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1492,6 +1492,7 @@ static int __ref __offline_pages(unsigned long start_pfn, unsigned long pfn, nr_pages, expire; long offlined_pages; int ret, drain, retry_max, node; + unsigned long flags; struct zone *zone; struct memory_notify arg; @@ -1585,7 +1586,11 @@ repeat: /* removal success */ zone->managed_pages -= offlined_pages; zone->present_pages -= offlined_pages; + + pgdat_resize_lock(zone->zone_pgdat, &flags); zone->zone_pgdat->node_present_pages -= offlined_pages; + pgdat_resize_unlock(zone->zone_pgdat, &flags); + totalram_pages -= offlined_pages; init_per_zone_wmark_min(); |