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Date:      Mon, 11 Mar 2019 19:16:44 +1100
From:      Peter Jeremy <peter@rulingia.com>
To:        Warner Losh <imp@bsdimp.com>
Cc:        Alexey Dokuchaev <danfe@freebsd.org>, "Rodney W. Grimes" <rgrimes@freebsd.org>, Warner Losh <imp@freebsd.org>, svn-src-head <svn-src-head@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, src-committers <src-committers@freebsd.org>
Subject:   Re: svn commit: r344970 - head
Message-ID:  <20190311081644.GA87064@server.rulingia.com>
In-Reply-To: <CANCZdfpscc0feQ72FYnddX-9F1oduUdp3qAgC9BnZG=uKRq_4A@mail.gmail.com>
References:  <201903091717.x29HHjcc069618@repo.freebsd.org> <201903092000.x29K0Rf6002120@gndrsh.dnsmgr.net> <20190310150728.GA97029@FreeBSD.org> <CANCZdfpscc0feQ72FYnddX-9F1oduUdp3qAgC9BnZG=uKRq_4A@mail.gmail.com>

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On 2019-Mar-10 09:38:53 -0600, Warner Losh <imp@bsdimp.com> wrote:
>On Sun, Mar 10, 2019 at 9:07 AM Alexey Dokuchaev <danfe@freebsd.org> wrote:
>
>> On Sat, Mar 09, 2019 at 12:00:27PM -0800, Rodney W. Grimes wrote:
>> > > New Revision: 344970
>> > >     binaries).  Failure to do so may leave you with a system that is
>> > >     hard to boot to recover.  A GENERIC kernel will include suitable
>> > > -   compatibility options to run binaries from older branches.
>> > > +   compatibility options to run binaries from supported older
>> branches.
>> >
>> > This is probably not the best adjective here, supported only goes back=
 to
>> > 11.x, there are COMPAT options that work all the way back to 4.
>>
>> I concur, this "supported" word sounds like we barely give a fuck.  Being
>> able to run old (very old) binaries had always been one of our strengths,
>> and we should not suggest that it's not anymore.
>>
>
>It isn't saying we don't support older binaries. It sets the limits on what
=2E..
>upgrading from. We can (and do) support additional binaries, and having the
>clarification here doesn't change that.

I think the changed wording implies that we no longer provide compatibity
with unsupported branches.  I agree that we might in future decide to
remove COMPAT_FREEBSDx for unsupported x but until then, I'd prefer wording
along the lines of:
"A GENERIC kernel will include suitable compatibility options to run
 binaries from older branches.  Note that the ability to run binaries
 from unsupported branches is not guaranteed."

--=20
Peter Jeremy

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