[PATCH v2] Fix a build error when BLOCK=n

[Emil Medve]

mm/filemap.c: In function '__filemap_fdatawrite_range':
mm/filemap.c:200: error: implicit declaration of function 'mapping_cap_writeback_dirty'

This happens when we don't use/have any block devices and a NFS root filesystem
is used

mapping_cap_writeback_dirty() is defined in linux/backing-dev.h which used to be
provided in mm/filemap.c by linux/blkdev.h until commit
f5ff8422bbdd59f8c1f699df248e1b7a11073027

Signed-off-by: Emil Medve <Emilian.Medve@xxxxxxxxxxxxx>
---

This is against Linus' tree: d85714d81cc0408daddb68c10f7fd69eafe7c213

linux-2.6> scripts/checkpatch.pl 0001-Fix-a-build-error-when-BLOCK-n.patch 
Your patch has no obvious style problems and is ready for submission.

 mm/filemap.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 79f24a9..61efe94 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -27,6 +27,7 @@
 #include <linux/writeback.h>
 #include <linux/pagevec.h>
 #include <linux/blkdev.h>
+#include <linux/backing-dev.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/cpuset.h>
-- 
1.5.3.GIT

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