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Date:      Fri, 4 Nov 2005 11:43:19 -0500
From:      John Baldwin <jhb@FreeBSD.org>
To:        Ruslan Ermilov <ru@FreeBSD.org>
Cc:        cvs-src@FreeBSD.org, ceri@submonkey.net, cvs-all@FreeBSD.org, "M. Warner Losh" <imp@bsdimp.com>, src-committers@FreeBSD.org
Subject:   Re: cvs commit: src/usr.sbin/config configvers.h
Message-ID:  <200511041143.22007.jhb@FreeBSD.org>
In-Reply-To: <20051104163200.GZ63539@ip.net.ua>
References:  <20051104093436.GI29387@submonkey.net> <20051104.091549.55832472.imp@bsdimp.com> <20051104163200.GZ63539@ip.net.ua>

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On Friday 04 November 2005 11:32 am, Ruslan Ermilov wrote:
> On Fri, Nov 04, 2005 at 09:15:49AM -0700, M. Warner Losh wrote:
> > In message: <20051104120642.GL29387@submonkey.net>
> >
> >             Ceri Davies <ceri@submonkey.net> writes:
> > : On Fri, Nov 04, 2005 at 12:56:01PM +0200, Ruslan Ermilov wrote:
> > : > On Fri, Nov 04, 2005 at 09:34:36AM +0000, Ceri Davies wrote:
> > : > > On Fri, Nov 04, 2005 at 09:18:58AM +0200, Ruslan Ermilov wrote:
> > : > > > On Fri, Nov 04, 2005 at 04:16:44AM +0000, Warner Losh wrote:
> > : > > > > imp         2005-11-04 04:16:44 UTC
> > : > > > >
> > : > > > >   FreeBSD src repository
> > : > > > >
> > : > > > >   Modified files:
> > : > > > >     usr.sbin/config      configvers.h
> > : > > > >   Log:
> > : > > > >   since nocpu isn't used in the kernel config base, we don't
> > : > > > > need to bump the version.  Peter Wemm, John Baldwin and I
> > : > > > > hammered this out after the last time I needlessly incremented
> > : > > > > the version.
> > : > > > >
> > : > > > >   Revision  Changes    Path
> > : > > > >   1.38      +1 -1      src/usr.sbin/config/configvers.h
> > : > > >
> > : > > > Our users wanted to *use* the "nocpu" directive in their configs
> > : > > > that are based on GENERIC (GENERIC is included), hence I bumped
> > : > > > config(8).  Otherwise, one day some would scream that "nocpu"
> > : > > > doesn't work for them, because they're using the older version
> > : > > > of config(8).
> >
> > I will agree that bumping the config version will force users to
> > install a new config.  At the same time, a new config cannot be used
> > for old kernels, like the ones in 6.0.  Since this is the only
> > incompatibility between 6.0 and current, it seemed a little
> > gratuitous.
> >
> > There's no documentation about what features are in what versions of
> > config.  If you don't bump the version, then we can MFC these changes
> > and users can use config in 6.x.  A nit is that there's no nocpu in
> > config.5.

config.5 is already a different version though.

> > : > > I'd agree that the Makefiles don't need to be bumped, as they don=
't
> > : > > actually require the new config, but config has new functionality
> > : > > and the version should probably be bumped in the binary.
> > : >
> > : > You cannot just bump it in one place, the version requirement doesn=
't
> > : > understand >=3D, only =3D.
> > :
> > : Oh.  Insert obvious next question here. :)
> > : What happens to those people who have already installed 600004 then?
> >
> > They will need to install a new config if they want to build a new
> > kernel.  Maybe it is time to change the versioning so that multiple
> > versions will work.
>
> This is all not needed if you're using an official upgrade method:
> buildworld/buildkernel, which will take care of updating config(8)
> for you.

I never do that for test kernels as it is too tedious. :)  Also, for my tes=
t=20
kernels it is very handy to have the build directory shared over NFS just=20
like my test trees so that if the machine crashes, I still have access to t=
he=20
kernel.debug on my NFS server.  I think the more useful thing would be to g=
et=20
config to understand >=3D for it's version tests though so that version bum=
ps=20
aren't quite so painful.

=2D-=20
John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org



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