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

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Message-ID: <53C3994C.1010309@metafoo.de>
Date:	Mon, 14 Jul 2014 10:48:12 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Richard Weinberger <richard@....at>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	dmitry.torokhov@...il.com, linux-iio@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>, teg@...m.no,
	thierry.reding@...il.com, Lennox Wu <lennox.wu@...il.com>,
	Chen Gang <gang.chen.5i5j@...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
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'

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.

- Lars

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