[PATCH] memory hotplug locking: node_size_lock

[linux-2.6.git] / include / linux / mmzone.h

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 4674145..e050d68 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -273,6 +273,16 @@ typedef struct pglist_data {
        struct page *node_mem_map;
 #endif
        struct bootmem_data *bdata;
+#ifdef CONFIG_MEMORY_HOTPLUG
+       /*
+        * Must be held any time you expect node_start_pfn, node_present_pages
+        * or node_spanned_pages stay constant.  Holding this will also
+        * guarantee that any pfn_valid() stays that way.
+        *
+        * Nests above zone->lock and zone->size_seqlock.
+        */
+       spinlock_t node_size_lock;
+#endif
        unsigned long node_start_pfn;
        unsigned long node_present_pages; /* total number of physical pages */
        unsigned long node_spanned_pages; /* total size of physical page
@@ -293,6 +303,8 @@ typedef struct pglist_data {
 #endif
 #define nid_page_nr(nid, pagenr)       pgdat_page_nr(NODE_DATA(nid),(pagenr))
 
+#include <linux/memory_hotplug.h>
+
 extern struct pglist_data *pgdat_list;
 
 void __get_zone_counts(unsigned long *active, unsigned long *inactive,