cpusets: randomize node rotor used in cpuset_mem_spread_node()

[safe/jmp/linux-2.6] / include / linux / nodemask.h

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index dba35e4..8a8f1d0 100644 (file)
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -66,6 +66,8 @@
  * int num_online_nodes()              Number of online Nodes
  * int num_possible_nodes()            Number of all possible Nodes
  *
+ * int node_random(mask)               Random node with set bit in mask
+ *
  * int node_online(node)               Is some node online?
  * int node_possible(node)             Is some node possible?
  *
@@ -430,6 +432,10 @@ static inline void node_set_offline(int nid)
        node_clear_state(nid, N_ONLINE);
        nr_online_nodes = num_node_state(N_ONLINE);
 }
+
+#define node_random(mask) __node_random(&(mask))
+extern int __node_random(const nodemask_t *maskp);
+
 #else
 
 static inline int node_state(int node, enum node_states state)
@@ -460,6 +466,8 @@ static inline int num_node_state(enum node_states state)
 
 #define node_set_online(node)     node_set_state((node), N_ONLINE)
 #define node_set_offline(node)    node_clear_state((node), N_ONLINE)
+
+static inline int node_random(const nodemask_t mask) { return 0; }
 #endif
 
 #define node_online_map        node_states[N_ONLINE]