[PATCH] vfs: fix compilation for no-MMU configurations

["Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>]

Commit ac4dd23b76ce introduced a new function pagecache_isize_extended.
In <linux/mm.h> it was declared static inline and empty for no-MMU and
defined unconditionally in mm/truncate.c which results a compiler
error:

	  CC      mm/truncate.o
	mm/truncate.c:751:6: error: redefinition of 'pagecache_isize_extended'
	 void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
	      ^
	In file included from mm/truncate.c:13:0:
	include/linux/mm.h:1161:91: note: previous definition of 'pagecache_isize_extended' was here
	 static inline void pagecache_isize_extended(struct inode *inode, loff_t from,
												   ^
	scripts/Makefile.build:257: recipe for target 'mm/truncate.o' failed

(tested with ARCH=arm efm32_defconfig).

Fixes: ac4dd23b76ce ("vfs: fix data corruption when blocksize < pagesize for mmaped data")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
Hello,

the bad commit sits in

git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git#dev

and is included in next.

Best regards
Uwe

 mm/truncate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/truncate.c b/mm/truncate.c
index 261eaf6e5a19..0d9c4ebd5ecc 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -729,6 +729,7 @@ void truncate_setsize(struct inode *inode, loff_t newsize)
 }
 EXPORT_SYMBOL(truncate_setsize);
 
+#ifdef CONFIG_MMU
 /**
  * pagecache_isize_extended - update pagecache after extension of i_size
  * @inode:	inode for which i_size was extended
@@ -780,6 +781,7 @@ void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
 	page_cache_release(page);
 }
 EXPORT_SYMBOL(pagecache_isize_extended);
+#endif
 
 /**
  * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
-- 
2.1.0

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