[PATCH] logfs: fix logfs build errors and dependencies

From: Randy Dunlap
Date: Fri Jan 08 2016 - 14:26:03 EST

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix build errors that happen when CONFIG_LOGFS=y and CONFIG_MTD=m:

fs/built-in.o: In function `logfs_mount':
super.c:(.text+0x92a6f): undefined reference to `logfs_get_sb_mtd'
fs/built-in.o: In function `logfs_get_sb_bdev':
(.text+0x93530): undefined reference to `logfs_get_sb_mtd'

This change allows CONFIG_BLOCK and CONFIG_MTD to be disabled, but
if either of them is enabled, CONFIG_LOGFS is limited (restricted) by
the setting of the former symbol(s).

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Joern Engel <joern@xxxxxxxxx>
Cc: Prasad Joshi <prasadjoshi.linux@xxxxxxxxx>
Cc: logfs@xxxxxxxxx
fs/logfs/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

Found in linux-next but applies to mainline also.

--- linux-next-20160108.orig/fs/logfs/Kconfig
+++ linux-next-20160108/fs/logfs/Kconfig
@@ -1,6 +1,7 @@
config LOGFS
tristate "LogFS file system"
- depends on (MTD || BLOCK)
+ depends on BLOCK || BLOCK=n
+ depends on MTD || MTD=n
select CRC32