From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'
Date: Mon, 14 Jul 2014 10:48:12 +0200
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To: Richard Weinberger <richard@nod.at>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Marek Vasut <marex@denx.de>, Liqin Chen <liqin.linux@gmail.com>, devel@driverdev.osuosl.org, Chen Gang <gang.chen.5i5j@gmail.com>, linux-pwm@vger.kernel.org, linux-iio@vger.kernel.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, dmitry.torokhov@gmail.com, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, teg@jklm.no, Martin Schwidefsky <schwidefsky@de.ibm.com>, thierry.reding@gmail.com, jic23@kernel.org, msalter@redhat.com, knaack.h@gmx.de, linux-input@vger.kernel.org, Mischa.Jonker@synopsys.com, Lennox Wu <lennox.wu@gmail.com>, linux-watchdog@vger.kernel.org
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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