From: Frans Pop <elendil@planet.nl>
To: David Rientjes <rientjes@google.com>
Subject: Re: [PATCH, v2] kbuild: Improve version string logic
Date: Wed, 14 Oct 2009 23:55:58 +0200
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>, Dirk Hohndel <hohndel@infradead.org>,
       Len Brown <lenb@kernel.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wednesday 14 October 2009, David Rientjes wrote:
> On Tue, 13 Oct 2009, Linus Torvalds wrote:
> > Let's keep the old behavior by making the AUTO option an three-way
> > choice ("none", "short", "auto"), and making sure that it actually
> > takes work to choose "none" (and that "make oldconfig" doesn't choose
> > it unless you explicitly made the choice before - so people who just
> > re-use old .config files wouldn't get "none" by mistake).

I'm working on a patch that implements this; will post it later.

> I don't think you want to do that because it would require the .config
> to be posted on bug reports, for example, to determine the setting of
> CONFIG_LOCALVERSION_AUTO before you can interpret the kernel version. 
> In other words, you wouldn't know that "2.6.32-rc4" is actually 200
> commits beyond the actual release unless you also know that the .config
> has CONFIG_LOCALVERSION_AUTO="none".

Even with this patch you can never be 100% sure of that, for example 
because you cannot be 100% certain that a kernel was built from a tree 
that's under revision control. The most *any* change can do is increase 
the likelyhood that we get that information in the version number.

Will explain more in a different reply later.

> Signed-off-by: David Rientjes <rientjes@google.com>
> ---
>  Makefile |   32 ++++++++++++++++++++------------
>  1 files changed, 20 insertions(+), 12 deletions(-)
>
> diff --git a/Makefile b/Makefile
> --- a/Makefile
> +++ b/Makefile
> @@ -898,9 +898,13 @@ $(vmlinux-dirs): prepare scripts
>  #	  $(localver)
>  #	    localversion*		(files without backups, containing '~')
>  #	    $(CONFIG_LOCALVERSION)	(from kernel config setting)
> -#	  $(localver-auto)		(only if CONFIG_LOCALVERSION_AUTO is set)
> -#	    ./scripts/setlocalversion	(SCM tag, if one exists)
> -#	    $(LOCALVERSION)		(from make command line if provided)
> +#	    $(LOCALVERSION)		(from make command line, if provided)
> +#	  $(localver-extra)
> +#	    $(scm-identifier)		(unique SCM tag, if one exists)
> +#	      ./scripts/setlocalversion	(only with CONFIG_LOCALVERSION_AUTO)
> +#	      .scmversion		(only with CONFIG_LOCALVERSION_AUTO)
> +#	    +				(only without CONFIG_LOCALVERSION_AUTO
> +#					 and repository is at non-tagged commit)
>  #
>  #  Note how the final $(localver-auto) string is included *only* if the

You forgot to change the $(localver-auto) here; and maybe also remove that 
leading space in this line.
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