Fix NR_UNSTABLE_NFS accounting

Move the decrement of NR_UNSTABLE higher in the loop where the page is still
available and get rid of the old hokus pokus.

Tested on: NUMA IA64 and a x86_64 single processor configuration.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.17-mm1/fs/nfs/pagelist.c
===================================================================
--- linux-2.6.17-mm1.orig/fs/nfs/pagelist.c	2006-06-24 10:25:25.787101004 -0700
+++ linux-2.6.17-mm1/fs/nfs/pagelist.c	2006-06-24 11:58:54.579382227 -0700
@@ -154,7 +154,6 @@ void nfs_clear_request(struct nfs_page *
 {
 	struct page *page = req->wb_page;
 	if (page != NULL) {
-		dec_zone_page_state(page, NR_UNSTABLE_NFS);
 		page_cache_release(page);
 		req->wb_page = NULL;
 	}
Index: linux-2.6.17-mm1/fs/nfs/write.c
===================================================================
--- linux-2.6.17-mm1.orig/fs/nfs/write.c	2006-06-24 10:25:25.781241992 -0700
+++ linux-2.6.17-mm1/fs/nfs/write.c	2006-06-24 13:34:59.385737173 -0700
@@ -1397,6 +1397,7 @@ static void nfs_commit_done(struct rpc_t
 	while (!list_empty(&data->pages)) {
 		req = nfs_list_entry(data->pages.next);
 		nfs_list_remove_request(req);
+		dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
 
 		dprintk("NFS: commit (%s/%Ld %d@%Ld)",
 			req->wb_context->dentry->d_inode->i_sb->s_id,
@@ -1422,8 +1423,6 @@ static void nfs_commit_done(struct rpc_t
 		dprintk(" mismatch\n");
 		nfs_mark_request_dirty(req);
 	next:
-		if (req->wb_page)
-			dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
 		nfs_clear_page_writeback(req);
 	}
 }