netdev - Re: [PATCH] drivers/ptp/Kconfig: add "depends on HAS_IOMEM" for 'PTP_1588_CLOCK

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Date:	Mon, 1 Jul 2013 09:32:04 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Richard Weinberger <richard@....at>,
	David Miller <davem@...emloft.net>,
	Richard Cochran <richardcochran@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] drivers/ptp/Kconfig: add "depends on HAS_IOMEM" for 'PTP_1588_CLOCK_PCH'

On Mon, Jul 1, 2013 at 8:44 AM, Chen Gang <gang.chen@...anux.com> wrote:
> On 07/01/2013 02:34 PM, Richard Weinberger wrote:
>>> config COMPILE_TEST
>>> >         bool "Compile also drivers which will not load"
>>> >         default n
>>> >         help
>>> >           Some drivers can be compiled on a different platform than they are
>>> >           intended to be run on. Despite they cannot be loaded there (or even
>>> >           when they load they cannot be used due to missing HW support),
>>> >           developers still, opposing to distributors, might want to build such
>>> >           drivers to compile-test them.
>>> >
>>> >           If you are a developer and want to build everything available, say Y
>>> >           here. If you are a user/distributor, say N here to exclude useless
>>> >           drivers to be distributed.
>>> >
>>> > I guess, 'COMPILE_TEST' is really useful for UML.
>> No.
>>
>> We have explained you more than once what the deal and why UML does not
>> have ioremap() and friends.
>
> This time, it is not for UML, it is for 'COMPILE_TEST': the
> 'asm-generic' whether need consider it.

COMPILE_TEST is only meant to be used as a dependency in Kconfig files,
to make drivers that cannot work due to missing hardware invisible when
configuring your kernel.

There should be no #ifdefs in actual code that check for (the lack of)
CONFIG_COMPILE_TEST.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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