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From: Thomas Gleixner <tglx@linutronix.de>
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To: Josh Triplett <josh@joshtriplett.org>, Mauro Carvalho Chehab
 <mchehab@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>, ksummit@lists.linux.dev
Subject: Re: [MAINTAINER SUMMIT] User-space requirements for accelerator
 drivers
In-Reply-To: <YTvuDsrUNhg/VXD0@localhost>
References: <877dfop2lx.fsf@meer.lwn.net> <20210911005214.71b55ac6@coco.lan>
 <YTvuDsrUNhg/VXD0@localhost>
Date: Sat, 11 Sep 2021 01:55:16 +0200
Message-ID: <87ilz8c7ff.ffs@tglx>
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On Fri, Sep 10 2021 at 16:45, Josh Triplett wrote:

> On Sat, Sep 11, 2021 at 12:52:14AM +0200, Mauro Carvalho Chehab wrote:
>> On media, enforcing userspace to always be open source would
>> have been very bad, as it would prevent several videoconferencing 
>> software to exist on Linux.
>
> I don't think we should enforce that all userspace users of an interface
> be Open Source. I do think we should enforce that *some* userspace user
> of an interface be Open Source before we add the interface.

The real question is whether the interface is documented in a way that
an Open Source implementation is possible. It does not matter whether it
exists at that point in time or not. Even if it exists there is no
guarantee that it is feature complete.

Freely accessible documentation is really the key.

Thanks,

        tglx