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

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Message-ID: <51D1341E.6090908@asianux.com>
Date:	Mon, 01 Jul 2013 15:47:42 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
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 07/01/2013 03:32 PM, Geert Uytterhoeven wrote:
> 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.
> 

Why "Despite they cannot be loaded there (or even when they load they
cannot be used due to missing HW support)" ?

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

In ideal world, it should be no #ifdefs for all "CONFIG_*" in 'normal code'.

But "asm-generic" are not belong to 'normal code', it is one of the main
place to process "CONFIG_*".

If the platforms need support 'COMPILE_TEST', the asm-generic is the
main place for implementing it.


So I think our focus is on "whether the platforms guys need support
'COMPILE_TEST" for modules guys".


Thanks
-- 
Chen Gang
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