linux-kernel - Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for 'devm_ioremap

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Message-ID: <53C86C10.2000608@gmail.com>
Date:	Fri, 18 Jul 2014 08:36:32 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Richard Weinberger <richard@....at>, Arnd Bergmann <arnd@...db.de>,
	Lars-Peter Clausen <lars@...afoo.de>
CC:	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	dmitry.torokhov@...il.com, linux-iio@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>, teg@...m.no,
	Thierry Reding <thierry.reding@...il.com>,
	Lennox Wu <lennox.wu@...il.com>, Marek Vasut <marex@...x.de>,
	Liqin Chen <liqin.linux@...il.com>, msalter@...hat.com,
	linux-pwm@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-watchdog@...r.kernel.org, linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	knaack.h@....de, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Mischa.Jonker@...opsys.com, jic23@...nel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'


On 07/18/2014 02:09 AM, Richard Weinberger wrote:
> Am 17.07.2014 12:48, schrieb Arnd Bergmann:
>> AFAICT, NO_IOMEM only has a real purpose on UML these days. Could we take
>> a shortcut here and make COMPILE_TEST depend on !UML? Getting random stuff
>> to build on UML seems pointless to me and we special-case it in a number of
>> places already.
> 
> If UML is the only arch without io memory the dependency on !UML seems
> reasonable to me. :-)
> 

For me, if only uml left, I suggest to implement dummy functions within
uml instead of let CONFIG_UML appear in generic include directory. And
then remove all HAS_IOMEM and NO_IOMEM from kernel.

If score sticks to NO_IOMEM, and can not remove score from kernel only
because of this reason. I also suggest implement dummy functions within
score itself.


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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