ia64: revert __node_random addition

This partially reverts commit 4ec37de8
("[IA64] Fix build breakage"), since the commit that made it necessary
got reverted earlier (see commit 35926ff5, 'Revert "cpusets:
randomize node rotor used in cpuset_mem_spread_node()"')

Even if we ever re-introduce this, there is no reason to make
__node_random be some architecture-specific function.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/mm/numa.c

@@ -17,7 +17,6 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/module.h>
-#include <linux/random.h>
 #include <asm/mmzone.h>
 #include <asm/numa.h>
 
@@ -51,22 +50,6 @@ paddr_to_nid(unsigned long paddr)
 	return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
 }
 
-/*
- * Return the bit number of a random bit set in the nodemask.
- *   (returns -1 if nodemask is empty)
- */
-int __node_random(const nodemask_t *maskp)
-{
-	int w, bit = -1;
-
-	w = nodes_weight(*maskp);
-	if (w)
-		bit = bitmap_ord_to_pos(maskp->bits,
-			get_random_int() % w, MAX_NUMNODES);
-	return bit;
-}
-EXPORT_SYMBOL(__node_random);
-
 #if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
 /*
  * Because of holes evaluate on section limits.