linux-kernel - Re: [patch for-3.8] fs, dlm: fix build error when EXPERIMENTAL is disabled

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Date:	Tue, 12 Feb 2013 09:50:05 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christine Caulfield <ccaulfie@...hat.com>,
	David Teigland <teigland@...hat.com>, cluster-devel@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch for-3.8] fs, dlm: fix build error when EXPERIMENTAL is
 disabled

Hi,

On Mon, 2013-02-11 at 13:48 -0800, David Rientjes wrote:
> CONFIG_IP_SCTP relies on being able to select things like CONFIG_CRC32C to 
> build.  Thus, nothing should be selecting CONFIG_IP_SCTP that does not 
> meet its requirements.
> 
> For example, if CONFIG_EXPERIMENTAL is disabled and CONFIG_DLM is enabled, 
> the build fails at link time:
> 
> 	net/built-in.o: In function `sctp_crc32c':
> 	include/net/sctp/checksum.h:51: undefined reference to `crc32c'
> 	include/net/sctp/checksum.h:51: undefined reference to `crc32c'
> 	include/net/sctp/checksum.h:51: undefined reference to `crc32c'
> 	include/net/sctp/checksum.h:51: undefined reference to `crc32c'
> 	include/net/sctp/checksum.h:51: undefined reference to `crc32c'
> 	net/built-in.o:include/net/sctp/checksum.h:51: more undefined references to `crc32c' follow
> 
> Fix this by making CONFIG_DLM depend on CONFIG_EXPERIMENTAL so that 
> CONFIG_IP_SCTP properly builds.
> 
That doesn't seem right to me... DLM has not been experimental for a
long time now. Why not just select CRC32 in addition to IP_SCTP ?

Steve.

> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---
>  fs/dlm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/dlm/Kconfig b/fs/dlm/Kconfig
> --- a/fs/dlm/Kconfig
> +++ b/fs/dlm/Kconfig
> @@ -2,6 +2,7 @@ menuconfig DLM
>  	tristate "Distributed Lock Manager (DLM)"
>  	depends on INET
>  	depends on SYSFS && CONFIGFS_FS && (IPV6 || IPV6=n)
> +	depends on EXPERIMENTAL
>  	select IP_SCTP
>  	help
>  	A general purpose distributed lock manager for kernel or userspace
> --
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