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

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Date:	Fri, 18 Jul 2014 23:37:21 +0800
From:	Lennox Wu <lennox.wu@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	Chen Gang <gang.chen.5i5j@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-iio@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tom Gundersen <teg@...m.no>,
	Thierry Reding <thierry.reding@...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'

Score can provide dummy functions if HAS_IOMEM  and NO_IOMEM will be
removed, even if we indeed have no IOMEM.

Best,
Lennox

2014-07-18 18:51 GMT+08:00 Richard Weinberger <richard@....at>:
> Am 18.07.2014 12:44, schrieb Chen Gang:
>> On 07/18/2014 03:35 PM, Richard Weinberger wrote:
>>> Am 18.07.2014 02:36, schrieb Chen Gang:
>>>>
>>>> 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.
>>>
>>> Erm, this is something completely different.
>>> I thought we're focusing on COMPILE_TEST?
>>>
>>
>> COMPILE_TEST is none-architecture specific, but UML is. So in generic
>> include folder, if we're focusing on choosing whether COMPILE_TEST or
>> UML, for me, I will choose COMPILE_TEST.
>>
>> If we're not only focusing on COMPILE_TEST, for me, if something only
>> depend on one architecture, I'd like to put them under "arch/*/" folder.
>>
>> Especially, after that, we can remove all HAS_IOMEM and NO_IOMEM, nobody
>> has to think of them again. :-)
>
> And then we end up with a solution that on UML a lot of completely useless
> drivers are build which fail in various interesting manners because you'll
> add stubs for all kinds of io memory related functions to arch/um/?
> We had this kind of discussion already. You'll need more than ioremap...
>
> I like Arnd's idea *much* more to make COMPILE_TEST depend on !UML.
>
> Thanks,
> //richard
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