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

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Date:	Tue, 22 Jul 2014 19:29:35 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Lennox Wu <lennox.wu@...il.com>,
	Richard Weinberger <richard@....at>,
	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>,
	jic23@...nel.org, Geert Uytterhoeven <geert@...ux-m68k.org>,
	cmetcalf@...era.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'



On 07/22/2014 06:32 PM, Arnd Bergmann wrote:
> On Sunday 20 July 2014 17:45:40 Chen Gang wrote:
>>>
>>> Next, I shall:
>>>
>>>  - Remove HAS_IOMEM and NO_IOMEM from kernel, firstly.
>>>
>>>  - Try to make dummy IOMEM functions for score architecture.
>>>
>>>  - Continue discussing with UML for it.
>>>
>>  
>> Oh, sorry, I forgot, after remove IOMEM from kernel, also s390 and tile
>> need implement dummy IOMEM if !PCI.
>>
>> If possible, I shall try to implement the dummy IOMEM in 'asm-generic',
>> and let uml, score, s390 and tile use them when they need.
> 
> Sorry for going round in circles, but looking back at the original patches,
> adding the extra 'depends on HAS_IOMEM' does seem much better than the
> other suggestions that came afterwards.
> 
> In particular, removing HAS_IOMEM and NO_IOMEM sounds like an awful idea
> to me. I'd rather add a HAS_IOPORT in addition to also catch architectures
> that have no support for PC-style PIO.
> 

Welcome any other members (especially driver members) ideas and
suggestions -- driver members and architecture members have different
tastes and different roles.

For me, if no additional reply, I prefer to keep current status, and
still add 'depends on HAS_IOMEM' for each driver which need it, but I am
not sure whether driver members can bear it.


Thanks.
-- 
Chen Gang

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