linux-kernel - Re: [RFC 00/17] Remove GENERIC

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Message-ID: <CAAVeFuLUXrBjHvRugHK5jaKfUOm58LWe_NV=3fmt7Mr1J0yjXw@mail.gmail.com>
Date:	Tue, 12 Mar 2013 22:44:13 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Mike Frysinger <vapier@...too.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Jonas Bonn <jonas@...thpole.se>,
	Josh Boyer <jwboyer@...il.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 00/17] Remove GENERIC_GPIO from architecture code

On Tue, Mar 12, 2013 at 8:23 PM, Arnd Bergmann <arnd@...db.de> wrote:
> Nice series,
>
> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks!

>> For most platforms, this change should be a no-op. However I would like to make
>> sure that everyone is ok with it and that nothing gets broken, as the effect of
>> changing configuration options are sometimes difficult to predict.
>
> It's probably worth pointing out which platforms actually change with this. For
> all I can tell, the only user-visible change is that m68k now cannot turn
> off gpiolib any more.

That's the one we are sure is affected indeed. I am also a little bit
worried about blackfin, since it used to compile with GENERIC_GPIO and
patch #15 removes that. However it seems that blackfin's GPIO driver
is unconditionally compiled, so the whole architecture might actually
need ARCH_REQUIRE_GPIOLIB now.

There are also some more subtle changes in mips and arm where I rely
on indirect selection of gpiolib to assume that GENERIC_GPIO will
remain true - it's a bit of a headache, actually. Anyway the arch
maintainers know better what they really need, so I prefer not to
assume too much on my own.

Alex.
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