linux-kernel - Re: [PATCH] cramfs: fix MTD dependency

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Date:   Fri, 10 Nov 2017 11:35:45 -0500 (EST)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cramfs: fix MTD dependency

On Fri, 10 Nov 2017, Arnd Bergmann wrote:

> With CONFIG_MTD=m and CONFIG_CRAMFS=y, we now get a link failure:
> 
> fs/cramfs/inode.o: In function `cramfs_mount':
> inode.c:(.text+0x220): undefined reference to `mount_mtd'
> fs/cramfs/inode.o: In function `cramfs_mtd_fill_super':
> inode.c:(.text+0x6d8): undefined reference to `mtd_point'
> inode.c:(.text+0xae4): undefined reference to `mtd_unpoint'
> 
> This adds a more specific Kconfig dependency to avoid the
> broken configuration. Alternatively we could make CRAMFS
> itself depend on "MTD || !MTD" with a similar result.
> 
> Fixes: 99c18ce580c6 ("cramfs: direct memory access support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  fs/cramfs/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/cramfs/Kconfig b/fs/cramfs/Kconfig
> index f937082f3244..58e2fe40b2a0 100644
> --- a/fs/cramfs/Kconfig
> +++ b/fs/cramfs/Kconfig
> @@ -34,6 +34,7 @@ config CRAMFS_BLOCKDEV
>  config CRAMFS_MTD
>  	bool "Support CramFs image directly mapped in physical memory"
>  	depends on CRAMFS && MTD
> +	depends on CRAMFS=m || MTD=y

I think the following is better:

diff --git a/fs/cramfs/Kconfig b/fs/cramfs/Kconfig
index f937082f32..a00740c668 100644
--- a/fs/cramfs/Kconfig
+++ b/fs/cramfs/Kconfig
@@ -33,7 +33,7 @@ config CRAMFS_BLOCKDEV
 
 config CRAMFS_MTD
 	bool "Support CramFs image directly mapped in physical memory"
-	depends on CRAMFS && MTD
+	depends on CRAMFS && (CRAMFS <= MTD)
 	default y if !CRAMFS_BLOCKDEV
 	help
 	  This option allows the CramFs driver to load data directly from

Nicolas