linux-kernel - Re: [PATCH v2] arch: Kconfig: Let all little endian architectures define CPU_LITTLE

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Date:	Sat, 23 Aug 2014 10:31:15 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Michal Marek <mmarek@...e.cz>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Salter <msalter@...hat.com>,
	"a-jacquiot@...com" <a-jacquiot@...com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-c6x-dev@...ux-c6x.org,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v2] arch: Kconfig: Let all little endian architectures
 define CPU_LITTLE_ENDIAN explicitly

On 8/22/14 19:09, Michal Marek wrote:
> Dne 13.8.2014 10:03, Geert Uytterhoeven napsal(a):
>> CC kbuild
>>
>> On Wed, Aug 13, 2014 at 12:48 AM, Chen Gang <gang.chen.5i5j@...il.com> wrote:
>>> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
>>> index c49a775..0510a5d 100644
>>> --- a/arch/arm/Kconfig
>>> +++ b/arch/arm/Kconfig
>>> @@ -199,6 +199,11 @@ config NEED_DMA_MAP_STATE
>>>  config ARCH_SUPPORTS_UPROBES
>>>         def_bool y
>>>
>>> +config CPU_LITTLE_ENDIAN
>>> +       depends on !CPU_BIG_ENDIAN
>>> +       def_bool y
>>> +
>>> +
>>>  config ARCH_HAS_DMA_SET_COHERENT_MASK
>>>         bool
>>
>> As this is a common symbol, and replicated for all affected architectures,
>> I'm wondering if we should have the "config CPU_LITTLE_ENDIAN" in
>> common Kconfig code instead, and make the individual architectures do a
>> "select CPU_LITTLE_ENDIAN"?
> 
> Yes!
> 
> 
>> Also we could have "config CPU_BIG_ENDIAN", too, and error out
>> if none or both are selected (can Kconfig error out?).
> 
> We can error out in the Makefile, if there is consensus that we should
> be doing so.
> 

OK, thanks. I have sent patch v3 for it, and did not check related error
in Kconfig files.

Please check the related patches (excuse me, I send the patch v3 only
according to "scripts/maintainers.pl", maybe not cc to you explicitly).


Thanks.
-- 
Chen Gang

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