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Date:   Sun, 18 Nov 2018 11:52:15 -0200
From:   Mauro Carvalho Chehab <mchehab@kernel.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     linux-media@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
        Alexandre Courbot <acourbot@chromium.org>,
        Hans Verkuil <hverkuil@xs4all.nl>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ben Hutchings <ben@decadent.org.uk>
Subject: Re: [PATCHv18 01/35] Documentation: v4l: document request API
Message-ID: <20181118115215.5ebc681c@coco.lan>
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        <20180814142047.93856-2-hverkuil@xs4all.nl>
        <alpine.DEB.2.21.1811121048400.14703@nanos.tec.linutronix.de>
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Hi Thomas,

Em Mon, 12 Nov 2018 11:06:43 -0800 (PST)
Thomas Gleixner <tglx@linutronix.de> escreveu:

> Folks,
> 
> On Tue, 14 Aug 2018, Hans Verkuil wrote:
> > From: Alexandre Courbot <acourbot@chromium.org>
> > 
> > Document the request API for V4L2 devices, and amend the documentation
> > of system calls influenced by it.
> > 
> > Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
> > Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> > Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>  
> 
> > @@ -0,0 +1,65 @@
> > +.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections  
> 
> It's nice that you try to use SPDX identifiers, but this is absolutely not
> how it works.
> 
> We went great length to document how SPDX identifiers are to be used and
> checkpatch emits a warning on this patch as well.
> 
>    WARNING: 'SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections' is not supported in LICENSES/...
> 
> It's well documented that the license text including metadata needs to be
> available in LICENSES.
> 
> What you are doing here is just counterproductive. The SPDX work is done to
> help automated license compliance. But the SPDX id above is broken and will
> let tools fail.
> 
> Even if we add the GFDL1.1 to LICENSES, it's still broken because there is
> no such exception 'no-invariant-section' and no, we are not going to create
> it just in the kernel without having sorted that with the SPDX folks first.

I know, and, after talking with Kate about that, I actually opened a SPDX
issue in Aug, 30:

	https://github.com/spdx/license-list-XML/issues/686

Btw, this is just the tip of the iceberg: I have another patchset pending
adding the GFDL license to LICENSES and doing some changes that are
required for Debian to be able to package the Kernel documentation:

	https://git.linuxtv.org/mchehab/experimental.git/log/?h=doc_license

It starts with Ben's patch:
	"Documentation/media: uapi: Explicitly say there are no Invariant Sections"

And tag media docs with SPDX headers.

> Mauro, you wrote yourself in a reply to this patch:
> 
>   > Mental note: we'll need to push the no-invariant-sections upstream
>   > before merging this there.  
> 
> and then you went and applied it nevertheless without talking to anyone who
> is involved with that SPDX effort of cleaning up the kernels licensing mess.

Sorry, I ended by sleeping on this. This specific patch was on a separate
topic branch. I completely forgot that this was waiting for SPDX committee
feedback about how to use GFDL.

> I'm grumpy about that particularly because you are the first person who
> complains about legal implications which might affect you.
> 
> But then you go and just ignore process and legal implications and push the
> crap into mainline.
> 
> Please get this sorted ASAP.

It would be great to have an ETA from SPDX about how long they'll
take to solve this issue. It has been about 2,5 months without
any concrete way about how we should address it.

I really don't want to add new documents at the media uAPI stuff
(with is GFDL due to historical reasons) without make them also
GPL. On the other hand, freezing API submissions to the media
subsystem just due to the lack of proper SPDX support for GFDL
seems plain wrong.

Perhaps one workaround would be to explicitly not using the
SPDX-License-Identifier, adding a longer licensing text that could
later be replaced by a SPDX license (if they ever figure out how
GFDL without invariants sections should be used). Something like:


	.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
	..
	.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
	..
	.. For GFDL-1.1-or-later, see:
	..
	.. Permission is granted to copy, distribute and/or modify this document
	.. under the terms of the GNU Free Documentation License, Version 1.1 or
	.. any later version published by the Free Software Foundation, with no
	.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
	.. A copy of the license is included at
	.. Documentation/media/uapi/fdl-appendix.rst.

Will that work for you?

If so, the patch solving the current issue is enclosed.

I'll rebase my other SPDX patchset to use the same solution after
we have an agreement on this.

Thanks,
Mauro

media: mediactl docs: don't use SPDX for GFDL

There is an open issue for using GFDL without invariant sections:

	https://github.com/spdx/license-list-XML/issues/686

So far, no progress.

While we don't have it, we can't really use SPDX identifiers on media.
So, replace them by a license text.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/Documentation/media/uapi/mediactl/media-ioc-request-alloc.rst b/Documentation/media/uapi/mediactl/media-ioc-request-alloc.rst
index 0f8b31874002..60874a1f3d89 100644
--- a/Documentation/media/uapi/mediactl/media-ioc-request-alloc.rst
+++ b/Documentation/media/uapi/mediactl/media-ioc-request-alloc.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _media_ioc_request_alloc:
 
diff --git a/Documentation/media/uapi/mediactl/media-request-ioc-queue.rst b/Documentation/media/uapi/mediactl/media-request-ioc-queue.rst
index 6dd2d7fea714..3f481256f75a 100644
--- a/Documentation/media/uapi/mediactl/media-request-ioc-queue.rst
+++ b/Documentation/media/uapi/mediactl/media-request-ioc-queue.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _media_request_ioc_queue:
 
diff --git a/Documentation/media/uapi/mediactl/media-request-ioc-reinit.rst b/Documentation/media/uapi/mediactl/media-request-ioc-reinit.rst
index febe888494c8..d9c4d308b477 100644
--- a/Documentation/media/uapi/mediactl/media-request-ioc-reinit.rst
+++ b/Documentation/media/uapi/mediactl/media-request-ioc-reinit.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _media_request_ioc_reinit:
 
diff --git a/Documentation/media/uapi/mediactl/request-api.rst b/Documentation/media/uapi/mediactl/request-api.rst
index 5f4a23029c48..7a85b346db91 100644
--- a/Documentation/media/uapi/mediactl/request-api.rst
+++ b/Documentation/media/uapi/mediactl/request-api.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _media-request-api:
 
diff --git a/Documentation/media/uapi/mediactl/request-func-close.rst b/Documentation/media/uapi/mediactl/request-func-close.rst
index 098d7f2b9548..c85275a8870c 100644
--- a/Documentation/media/uapi/mediactl/request-func-close.rst
+++ b/Documentation/media/uapi/mediactl/request-func-close.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _request-func-close:
 
diff --git a/Documentation/media/uapi/mediactl/request-func-ioctl.rst b/Documentation/media/uapi/mediactl/request-func-ioctl.rst
index ff7b072a6999..8b69465bd2dd 100644
--- a/Documentation/media/uapi/mediactl/request-func-ioctl.rst
+++ b/Documentation/media/uapi/mediactl/request-func-ioctl.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _request-func-ioctl:
 
diff --git a/Documentation/media/uapi/mediactl/request-func-poll.rst b/Documentation/media/uapi/mediactl/request-func-poll.rst
index 85191254f381..8f58f9948cb6 100644
--- a/Documentation/media/uapi/mediactl/request-func-poll.rst
+++ b/Documentation/media/uapi/mediactl/request-func-poll.rst
@@ -1,4 +1,15 @@
-.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
+.. SPDX License for this file: GPL-2.0 OR GFDL-1.1-or-later
+..
+.. For GPL-2.0, see LICENSES/preferred/GPL-2.0
+..
+.. For GFDL-1.1-or-later, see:
+..
+.. Permission is granted to copy, distribute and/or modify this document
+.. under the terms of the GNU Free Documentation License, Version 1.1 or
+.. any later version published by the Free Software Foundation, with no
+.. Invariant Sections, no Front-Cover Texts and no Back-Cover Texts.
+.. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
 
 .. _request-func-poll: