linux-kernel - Re: [-next PATCH 2/4] treewide: Use DEVICE_ATTR

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Message-ID: <alpine.DEB.2.20.1712201425010.13140@hadrien>
Date:   Wed, 20 Dec 2017 14:26:18 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joe Perches <joe@...ches.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Julia Lawall <julia.lawall@...6.fr>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Sebastian Ott <sebott@...ux.vnet.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
        James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Airlie <airlied@...ux.ie>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jiri Slaby <jslaby@...e.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        platform-driver-x86@...r.kernel.org, linux-scsi@...r.kernel.org,
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        linux-usb@...r.kernel.org, linux-fbdev@...r.kernel.org,
        alsa-devel@...a-project.org, linux-omap@...r.kernel.org
Subject: Re: [-next PATCH 2/4] treewide: Use DEVICE_ATTR_RW



On Wed, 20 Dec 2017, Joe Perches wrote:

> On Wed, 2017-12-20 at 10:59 +0100, Greg Kroah-Hartman wrote:
> > > > Why you didn't send that patch to the sysfs maintainer is a bit odd...  :)
> > >
> > > So here's an opportunity for you:
> > >
> > > The sysfs maintainer hasn't added include/linux/sysfs.h to
> > > the list of maintained files...
> > >
> > > DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS
> > > M:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
> > > S:	Supported
> > > F:	Documentation/kobject.txt
> > > F:	drivers/base/
> > > F:	fs/debugfs/
> > > F:	fs/sysfs/
> > > F:	include/linux/debugfs.h
> > > F:	include/linux/kobj*
> > > F:	lib/kobj*
> >
> > Heh, good point, but using get_maintainer.pl does put me at the top of
> > the list that you should be cc:ing:
> >
> > $ ./scripts/get_maintainer.pl --file include/linux/sysfs.h
> > Greg Kroah-Hartman <gregkh@...uxfoundation.org> (commit_signer:3/3=100%,authored:2/3=67%,added_lines:7/8=88%)
> > Kate Stewart <kstewart@...uxfoundation.org> (commit_signer:1/3=33%)
> > Thomas Gleixner <tglx@...utronix.de> (commit_signer:1/3=33%)
> > Philippe Ombredanne <pombredanne@...b.com> (commit_signer:1/3=33%)
> > Nick Desaulniers <nick.desaulniers@...il.com> (commit_signer:1/3=33%,authored:1/3=33%,added_lines:1/8=12%,removed_lines:1/1=100%)
> > linux-kernel@...r.kernel.org (open list)
>
> The script I use to send patches adds --nogit --nogit-fallback
> to copy only listed maintainers because people that send cleanup
> patches don't generally like to get random patches.
>
> > > btw: there are many uses of a reversed declaration style of DEVICE_ATTR
> > >
> > > Here's another thing that could be done for more DEVICE_ATTR_<FOO> uses.
> > >
> > > ===
> > >
> > > Some DEVICE_ATTR definitions use a reversed static function form from
> > > the typical.  Convert them to use the more common macro form so it is
> > > easier to grep for the style.
> []
> > > $ git grep --name-only -w DEVICE_ATTR | \
> > >   xargs perl -i dev_attr_rw_backwards.perl
> > Ah, nice, I love perl :
>
> That was a bad copy/paste of the script.
>
> The actual script for RW is:
>
> $ cat dev_attr_rw_backwards.perl
> local $/;
> while (<>) {
>     my $file = $_;
>     while ($file =~ m/\bDEVICE_ATTR\s*\(\s*(\w+)\s*,/g) {
> 	my $var = $1;
> 	if ($file =~ s/\bDEVICE_ATTR\s*\(\s*${var}\s*,\s*\(?(\s*S_IRUGO\s*\|\s*S_IWUSR|\s*S_IWUSR\s*\|\s*S_IRUGO\s*|\s*0644\s*)\)?\s*,\s*show_${var}\s*,\s*store_${var}\s*\)/DEVICE_ATTR_RW(${var})/g) {
> 	    $file =~ s/\bshow_${var}\b/${var}_show/g;
> 	    $file =~ s/\bstore_${var}\b/${var}_store/g;
> 	}
>     }
>     print $file;
> }
>
> There are 3 different perl scripts for rw, ro, and wo.
> and these scripts, because of function renaming and
> possible reuse of the original function names by other
> string concatenated macros, create some bad conversions
> so they need some manual cleanups too.
>
> Perhaps coccinelle could do a better job of it, but
> likely string concatenation macro uses are going to
> be hard to deal with in any case.

I made a rule for this at one point, but there are cases where the
functions have the wrong names, and then these functions may be used
elsewhere.

julia