linux-kernel - Re: [PATCH] MAINTAINERS add D: tag for subsystem commit prefix

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Date:   Sat, 28 Nov 2020 08:00:04 -0800
From:   Joe Perches <joe@...ches.com>
To:     Tom Rix <trix@...hat.com>, apw@...onical.com, nickhu@...estech.com,
        green.hu@...il.com, deanbo422@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MAINTAINERS add D: tag for subsystem commit prefix

On Sat, 2020-11-28 at 07:36 -0800, Tom Rix wrote:
> On 11/27/20 2:10 PM, Joe Perches wrote:
[]
> > I think an exception mechanism would be better than a specific
> > mechanism added to various entries.
> Can you give an example of what you mean ?

Inherit the parent prefix then add the basename(dirname) as a default.

For instance, changes to any subsystem of drivers/staging starts as
"staging: " and with "$basename(path): " appended.

So the MAINTAINERS entry for staging could be:

STAGING SUBSYSTEM
M:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
L:	devel@...verdev.osuosl.org
S:	Supported
T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
D:	"staging: "
F:	drivers/staging/

Any specified D: use would override the generic form.

And generic ARM changes could use the same mechanism with:

ARM PORT
M:	Russell King <linux@...linux.org.uk>
L:	linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
S:	Odd Fixes
W:	http://www.armlinux.org.uk/
T:	git git://git.armlinux.org.uk/~rmk/linux-arm.git
D:	"ARM: "
F:	arch/arm/
X:	arch/arm/boot/dts/

And media likewise:

MEDIA INPUT INFRASTRUCTURE (V4L/DVB)
M:	Mauro Carvalho Chehab <mchehab@...nel.org>
L:	linux-media@...r.kernel.org
S:	Maintained
W:	https://linuxtv.org
Q:	http://patchwork.kernel.org/project/linux-media/list/
T:	git git://linuxtv.org/media_tree.git
D:	"media: "
F:	Documentation/admin-guide/media/
F:	Documentation/devicetree/bindings/media/
F:	Documentation/driver-api/media/
F:	Documentation/userspace-api/media/
F:	drivers/media/
F:	drivers/staging/media/
F:	include/linux/platform_data/media/
F:	include/media/
F:	include/uapi/linux/dvb/
F:	include/uapi/linux/ivtv*
F:	include/uapi/linux/media.h
F:	include/uapi/linux/meye.h
F:	include/uapi/linux/uvcvideo.h
F:	include/uapi/linux/v4l2-*
F:	include/uapi/linux/videodev2.h

etc...

> > >  # check MAINTAINERS entries for the right ordering too
> > > -			my $preferred_order = 'MRLSWQBCPTFXNK';
> > > +			my $preferred_order = 'MRLSWQBCPTFXNKD';
> > >  			if ($rawline =~ /^\+[A-Z]:/ &&
> > >  			    $prevrawline =~ /^[\+ ][A-Z]:/) {
> > >  				$rawline =~ /^\+([A-Z]):\s*(.*)/;
> > I'd prefer to keep the file and keyword list last.
> > 
> So change to
> 
> my $preferred_order = 'MRLSWQBCPTDFXNK'; 
> 
> ?

Right.  And update the preferred_order in scripts/parse-maintainers.pl too.