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

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Date:   Tue, 21 Nov 2017 11:04:26 -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>

Well, my alternative fix depends on a kconfig fix which has not received 
any feedback yet. So let's do the obvious for now to cut on the build 
breakage reports.  Please could you push your patch upstream?

Acked-by- Nicolas Pitre <nico@...aro.org>

> ---
>  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
>  	default y if !CRAMFS_BLOCKDEV
>  	help
>  	  This option allows the CramFs driver to load data directly from
> -- 
> 2.9.0
> 
>