[PATCH] nfs: add missing prefetch.h include

[Heiko Carstens]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

Fix this compile error on s390:

  CC [M]  fs/nfs/blocklayout/blocklayout.o
fs/nfs/blocklayout/blocklayout.c: In function 'bl_end_io_read':
fs/nfs/blocklayout/blocklayout.c:201:4: error: implicit declaration of function 'prefetchw'

Introduced with 9549ec01 "pnfsblock: bl_read_pagelist".

Cc: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
 fs/nfs/blocklayout/blocklayout.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -36,6 +36,7 @@
 #include <linux/namei.h>
 #include <linux/bio.h>		/* struct bio */
 #include <linux/buffer_head.h>	/* various write calls */
+#include <linux/prefetch.h>
 
 #include "blocklayout.h"
 
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