[PATCH] define for_each_online_pgdat

This patch defines for_each_online_pgdat() as a replacement of
for_each_pgdat()

Now, online nodes are managed by node_online_map.  But for_each_pgdat()
uses pgdat_link to iterate over all nodes(pgdat).  This means management
structure for online pgdat is duplicated.

I think using node_online_map for for_each_pgdat() is simple and sane
rather ather than pgdat_link.  New macro is named as
for_each_online_pgdat().  Following patch will fix callers of
for_each_pgdat().

The bootmem allocater uses for_each_pgdat() before pgdat initialization.  I
don't think it's sane.  Following patch will fix it.

Signed-off-by: Yasunori Goto     <y-goto@jp.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index b959a4525cbd..1a9ef3e627d1 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -350,11 +350,15 @@ extern nodemask_t node_possible_map;
 #define num_possible_nodes()    nodes_weight(node_possible_map)
 #define node_online(node)       node_isset((node), node_online_map)
 #define node_possible(node)     node_isset((node), node_possible_map)
+#define first_online_node       first_node(node_online_map)
+#define next_online_node(nid)   next_node((nid), node_online_map)
 #else
 #define num_online_nodes()      1
 #define num_possible_nodes()    1
 #define node_online(node)       ((node) == 0)
 #define node_possible(node)     ((node) == 0)
+#define first_online_node       0
+#define next_online_node(nid)   (MAX_NUMNODES)
 #endif
 
 #define any_online_node(mask)                   \