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mmzone: note that node_size_lock should be manipulated via pgdat_resize_lock()

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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>
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Cody P Schafer 2013-07-03 15:02:09 -07:00 committed by Linus Torvalds
parent 72c3b51bda
commit 114d4b79f7
1 changed files with 3 additions and 0 deletions
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3
include/linux/mmzone.h
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@ -733,6 +733,9 @@ typedef struct pglist_data {
* or node_spanned_pages stay constant. Holding this will also
* guarantee that any pfn_valid() stays that way.
*
* pgdat_resize_lock() and pgdat_resize_unlock() are provided to
* manipulate node_size_lock without checking for CONFIG_MEMORY_HOTPLUG.
*
* Nests above zone->lock and zone->span_seqlock
*/
spinlock_t node_size_lock;