Subject: swap_prefetch: conversion of nr_writeback to per zone counter
From: Christoph Lameter <clameter@sgi.com>

Conversion of nr_writeback to per zone counter

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

Index: linux-2.6.17-rc6-cl/mm/swap_prefetch.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/swap_prefetch.c	2006-06-10 15:09:12.691768066 -0700
+++ linux-2.6.17-rc6-cl/mm/swap_prefetch.c	2006-06-10 15:18:17.095560797 -0700
@@ -381,7 +381,7 @@ static int prefetch_suitable(void)
 		get_page_state_node(&ps, node);
 
 		/* We shouldn't prefetch when we are doing writeback */
-		if (ps.nr_writeback) {
+		if (node_page_state(node, NR_WRITEBACK)) {
 			node_clear(node, sp_stat.prefetch_nodes);
 			continue;
 		}