linux-kernel - Re: kdbus: to merge or not to merge?

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Message-ID: <CALCETrWAGDL59GXkKzvJ4WXtj0AME3iTHhFCk6Wi5SNYceUqjA@mail.gmail.com>
Date:	Tue, 23 Jun 2015 08:07:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Havoc Pennington <havoc.pennington@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Daniel Mack <daniel@...que.org>
Subject: Re: kdbus: to merge or not to merge?

On Tue, Jun 23, 2015 at 12:22 AM, Richard Weinberger
<richard.weinberger@...il.com> wrote:
> On Tue, Jun 23, 2015 at 8:41 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
>>> The current state of uncertainty is problematic, I think.  The kdbus
>>> team is spending a lot of time making things compatible with kdbus,
>>> and the latest systemd release makes kdbus userspace support
>>> mandatory.
>>
>> I stopped here in this email, as this is just flat out totally wrong,
>> and I don't want to waste my time trying to refute other totally wrong
>> statements as that would just somehow give them some validation that
>> they could possibly be correct.
>
> For the guys who not follow systemd development, this is the
> announcement in question:
> http://lists.freedesktop.org/archives/systemd-devel/2015-June/033170.html
>
>         * kdbus support is no longer compile-time optional. It is now
>           always built-in. However, it can still be disabled at
>           runtime using the kdbus=0 kernel command line setting, and
>           that setting may be changed to default to off, by specifying
>           --disable-kdbus at build-time. Note though that the kernel
>           command line setting has no effect if the kdbus.ko kernel
>           module is not installed, in which case kdbus is (obviously)
>           also disabled. We encourage all downstream distributions to
>           begin testing kdbus by adding it to the kernel images in the
>           development distributions, and leaving kdbus support in
>           systemd enabled.

That is, indeed, what I was referring to.  Sorry if my half-a-sentence
summary wasn't spot on.

FWIW, once there are real distros with kdbus userspace enabled,
reviewing kdbus gets more complicated -- we'll be in the position
where merging kdbus in a different form from that which was proposed
will break existing users.

--Andy
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