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

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Date:	Fri, 22 Aug 2014 13:09:17 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Chen Gang <gang.chen.5i5j@...il.com>
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

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.

Michal
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