linux-kernel - Re: [PATCH] logfs: clarify MTD dependency

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Message-Id: <20160113123918.544497b48bf4c03591c75747@linux-foundation.org>
Date:	Wed, 13 Jan 2016 12:39:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	mmarek@...e.com, Peter Chen <peter.chen@...escale.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Joern Engel <joern@...fs.org>,
	Prasad Joshi <prasadjoshi.linux@...il.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] logfs: clarify MTD dependency

On Wed, 13 Jan 2016 14:25:55 +0100 Arnd Bergmann <arnd@...db.de> wrote:

> After a change to the way that composite modules work, we get
> a logfs build error:
> 
> fs/built-in.o: In function `logfs_mount':
> :(.text+0x139d34): undefined reference to `logfs_get_sb_mtd'
> fs/built-in.o: In function `logfs_get_sb_bdev':
> :(.text+0x13aa08): undefined reference to `logfs_get_sb_mtd'
> 
> This patch avoids the error by changing the dependencies of
> logfs in a way that we can no longer configure logfs as built-in
> when the MTD core is a loadable module, while leaving the
> dependency to require at least one of MTD or BLOCK to be
> enabled.
> 
> Another patch tried to work around the problem, but accidentally
> dropped the dependency on 'BLOCK || MTD', allowing the file
> system to be built if neither is selected.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: cf4f21938e13 ("kbuild: Allow to specify composite modules with modname-m")
> Fixes: e6be296f680c ("logfs: fix logfs build errors and dependencies")

Randy's "logfs: fix logfs build errors and dependencies" is an
only-in-mm thing.  So it would make sense to combine the two patches
into a single one and to give that an appropriate changelog.

How does this look? (Primary author was chosen randomly)


From: Arnd Bergmann <arnd@...db.de>
Subject: logfs: fix logfs build errors and dependencies

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 patch avoids the error by changing the dependencies of
logfs in a way that we can no longer configure logfs as built-in
when the MTD core is a loadable module, while leaving the
dependency to require at least one of MTD or BLOCK to be
enabled.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Peter Chen <peter.chen@...escale.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Joern Engel <joern@...fs.org>
Cc: Prasad Joshi <prasadjoshi.linux@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/logfs/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/logfs/Kconfig~logfs-fix-logfs-build-errors-and-dependencies fs/logfs/Kconfig
--- a/fs/logfs/Kconfig~logfs-fix-logfs-build-errors-and-dependencies
+++ a/fs/logfs/Kconfig
@@ -1,6 +1,6 @@
 config LOGFS
 	tristate "LogFS file system"
-	depends on (MTD || BLOCK)
+	depends on MTD || (!MTD && BLOCK)
 	select ZLIB_INFLATE
 	select ZLIB_DEFLATE
 	select CRC32
_