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

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Message-ID: <53C53CE1.4090803@gmail.com>
Date:	Tue, 15 Jul 2014 22:38:25 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Richard Weinberger <richard@....at>
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	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, arnd@...db.de,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'

On 07/15/2014 09:11 AM, Chen Gang wrote:
> 
> 
> On 07/15/2014 08:53 AM, Guenter Roeck wrote:
>> On 07/14/2014 05:34 PM, Chen Gang wrote:
>>> On 07/14/2014 05:22 PM, Chen Gang wrote:
>>>>
>>>> 在 2014年7月14日，下午4:57，Richard Weinberger <richard@....at> 写道：
>>>>
>>>>> Am 14.07.2014 10:48, schrieb Lars-Peter Clausen:
>>>>>> On 07/14/2014 10:31 AM, Richard Weinberger wrote:
>>>>>>> Am 13.07.2014 22:17, schrieb Greg Kroah-Hartman:
>>>>>>>> On Sun, Jul 13, 2014 at 09:33:38PM +0200, Richard Weinberger wrote:
>>>>>>>>> Maybe we could add COMPILE_TEST to the version string too?
>>>>>>>>> Just to detect such kernels fast in user bug reports...
>>>>>>>>
>>>>>>>> What kind of bug report are you going to get?
>>>>>>>
>>>>>>> User manages to enable CONFIG_FOO by selecting COMPILE_TEST and
>>>>>>> complains that it does not work. :)
>>>>>>
>>>>>> These drivers are typically drivers for some SoC peripheral and the
>>>>>> device will simply physically not exist on a platform that does not
>>>>>> provide HAS_IOMEM. This is not really any
>>>>>> different from making the driver selectable via COMPILE_TEST for
>>>>>> any other platform. To hit the issue you'd have to instantiate a
>>>>>> device driver instance for a device that
>>>>>> physically does not exist. This will always result in a failure.
>>>>>
>>>>> Okay, you have convinced me. :)
>>>>>
>>>
>>> After search the history patches, I found one related patch which made
>>> by myself (when I am in Asianux):
>>>
>>>    "https://lkml.org/lkml/2013/7/1/641"
>>>
>>> For me, it is a long discussion, and forced many members have to join
>>> in. Please help check again.
>>>
>>
>> One thing you could try would be to return NULL (or where appropriate
>> an error) in the #else case of CONFIG_HAS_IOMEM and CONFIG_HAS_IOPORT,
>> ie dont take COMPILE_TEST into account at all. Obviously that means
>> you won't be able to dump a warning message in the COMPILE_TEST
>> case, but at least the code would compile. The rejection of above patch
>> would make a good case for this approach.
>>
> 
> OK, thanks: at least, it can be improved.  But still welcome any other
> opinions of another related members.
> 

If no reply within 3 days (2014-07-18), I shall try to send related
patch for it within this week end (2014-07-20).

Thanks.
-- 
Chen Gang

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