[PATCH] Convert mempolicies to nodemask_t

The NUMA policy code predated nodemask_t so it used open coded bitmaps.
Convert everything to nodemask_t.  Big patch, but shouldn't have any actual
behaviour changes (except I removed one unnecessary check against
node_online_map and one unnecessary BUG_ON)
Signed-off-by: "Andi Kleen" <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/proc/task_mmu.c

@@ -469,7 +469,7 @@ static int show_numa_map(struct seq_file *m, void *v)
 		seq_printf(m, " interleave={");
 		first = 1;
 		for_each_node(n) {
-			if (test_bit(n, pol->v.nodes)) {
+			if (node_isset(n, pol->v.nodes)) {
 				if (!first)
 					seq_putc(m,',');
 				else

include/linux/mempolicy.h

@@ -27,10 +27,10 @@
 
 #include <linux/config.h>
 #include <linux/mmzone.h>
-#include <linux/bitmap.h>
 #include <linux/slab.h>
 #include <linux/rbtree.h>
 #include <linux/spinlock.h>
+#include <linux/nodemask.h>
 
 struct vm_area_struct;
 
@@ -63,7 +63,7 @@ struct mempolicy {
 	union {
 		struct zonelist  *zonelist;	/* bind */
 		short 		 preferred_node; /* preferred */
-		DECLARE_BITMAP(nodes, MAX_NUMNODES); /* interleave */
+		nodemask_t	 nodes;		/* interleave */
 		/* undefined for default */
 	} v;
 };