[PATCH] zoned vm counters: conversion of nr_writeback to per zone counter

Conversion of nr_writeback to per zone counter.

This removes the last page_state counter from arch/i386/mm/pgtable.c so we
drop the page_state from there.

[akpm@osdl.org: bugfix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1cc8412..885cc97 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -54,6 +54,7 @@
 	NR_SLAB,	/* Pages used by slab allocator */
 	NR_PAGETABLE,	/* used for pagetables */
 	NR_FILE_DIRTY,
+	NR_WRITEBACK,
 	NR_VM_ZONE_STAT_ITEMS };
 
 struct per_cpu_pages {