From: Pekka Enberg <penberg@cs.helsinki.fi>

As NOMMU does not include fs/revoke.c, we need to provide a stub for
generic_file_revoke() so that filesystems using it compile.

Cc: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/fs.h |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN include/linux/fs.h~revoke-core-code-generic_file_revoke-stub-for-nommu include/linux/fs.h
--- a/include/linux/fs.h~revoke-core-code-generic_file_revoke-stub-for-nommu
+++ a/include/linux/fs.h
@@ -1756,7 +1756,11 @@ extern long do_splice_direct(struct file
 		size_t len, unsigned int flags);
 
 /* fs/revoke.c */
+#ifdef CONFIG_MMU
 extern int generic_file_revoke(struct file *);
+#else
+#define generic_file_revoke NULL
+#endif
 
 extern void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
_