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Date:   Wed, 22 Nov 2017 14:48:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Rob Herring <rob.herring@...aro.org>,
        Jonas Oberg <jonas@...e.org>, Joe Perches <joe@...ches.com>,
        linux-xfs@...r.kernel.org,
        Charlemagne Lasse <charlemagnelasse@...il.com>,
        Carmen Bianca Bakker <carmenbianca@...e.org>
Subject: Re: [patch V4 01/11] Documentation: Add license-rules.rst to
 describe how to properly identify file licenses

On Wed, Nov 22, 2017 at 09:51:17AM -0200, Mauro Carvalho Chehab wrote:
> Em Wed, 22 Nov 2017 12:12:04 +0100 (CET)
> Thomas Gleixner <tglx@...utronix.de> escreveu:
> 
> > On Fri, 17 Nov 2017, Christoph Hellwig wrote:
> > > On Fri, Nov 17, 2017 at 07:11:41PM +0100, Thomas Gleixner wrote:  
> > > > Introcude a MODULE_LICENSE_SPDX macro which flags the module info storage
> > > > as 'SPDXIFY' and let the postprocessor do:  
> > > 
> > > Shouldn;t this be a FILE_LICENSE_SPDX?  I'd also much prefer that over
> > > the nasty C99 comments to start with.  And while I'm a bit behind on
> > > email I still haven't managed to find a good rationale for those to
> > > start with.
> 
> Yeah, I also find nasty to have things like this on each C file:
> 
> // SPDX-License-Identifier: GPL-2.0
> /*
>  * Copyright ...
>  * ...
>  */
> 
> Also, one may forget that headers use /**/ and end by doing the wrong
> thing, as a common practice is to just cut-and-paste the same copyright
> header on both C and H files at development time.

You break the build when you get it wrong, so you will notice it.  For
most "internal" .h files, using // is just fine.

Yes, it's "ugly", but again, that's what Linus said he wanted it to look
like, take it up with him :)

> > > So it would be good to figure this out before people start spamming
> > > the lists with all kinds of mass conversions and checkpatch fixes
> > > for licensing..  
> > 
> > I tried solving this with a macro in the first place and ran into issues:
> > 
> >    - Does not work in headers, especially not in UAPI ones
> 
> Make headers_install could replace such macros by SPDX comments when
> installing on userspace.

The big issue is when you build, putting those macros all into something
logical is a mess.  I too tried it and failed.

But feel to give it a go if you think it is possible :)

thanks,

greg k-h

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