linux-kernel - Re: [PATCH] init/Kconfig: Add ENDIAN attributes for all architectures using

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Date:	Sun, 14 Sep 2014 17:08:36 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	eparis@...hat.com, paulmck@...ux.vnet.ibm.com,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	zhenglong.cai@...c.com.cn, khilman@...aro.org, ak@...ux.intel.com,
	mcgrof@...e.com, fabf@...net.be,
	"dhowells@...hat.com" <dhowells@...hat.com>, pefoley2@...oley.com,
	mgorman@...e.de, biederm@...ssion.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH] init/Kconfig: Add ENDIAN attributes for all architectures
 using

Hello Maintainers:

Is this patch worthy enough to be applied?

Welcome any ideas, suggestions or completions.

Thanks.

On 09/03/2014 07:47 PM, Chen Gang wrote:
> On 09/02/2014 02:13 PM, Chen Gang wrote:
>> On 9/2/14 13:17, Paul Gortmaker wrote:
>>>
>>> OK, but that was not at _all_ what I thought when looking at this...
>>>
>>> Instead I saw a well intentioned, but perhaps not fully thought out
>>> attempt at fixing a largely irrelevant randconfig/allmodconfig of a
>>> 1990's vintage ISDN driver coming from that x86-only era, built against
>>> an architecture that will never use or support it (microblaze).
>>>
>>> In today's world, we'd probably not accept a new ethernet driver or
>>> filesystem if it was incapable of handling both BE and LE (exception
>>> being SoC ethernet physically bound to one specific CPU, of course.)
>>> So the justification given in the commit log for expanding the scope to
>>> better deal with the stuff found in ISDN and the like was questionable.
>>>
>>
> 
> I guess, we are mainly focus on: "Is it worthy enough to add *ENDIAN in
> init/Kconfig?"
> 
> It seems really few modules need depend on LE or BE (although I am still
> not quite sure). If it is true, for me, only for architectures, it is
> still worthy enough to let all duplicated *ENDIAN to one place.
> 
> If it is still worthy, maybe this patch need be improvement (especially,
> for its comments), so please help check when you have time, thanks.
> 
> 
> Welcome any other members' ideas, suggestions, or completions.
> 
> Thanks.
> 
>> After a simple search, for crypto, it may be endian sensitive, and for
>> architectures may be endian sensitive, in config time.
>>
>>   bash-3.2# find ./ | grep Kconfig | xargs grep depend | grep ENDIAN
>>   .//arch/arm/mm/Kconfig:	depends on ARCH_SUPPORTS_BIG_ENDIAN
>>   .//arch/arm/mm/Kconfig:	depends on CPU_BIG_ENDIAN
>>   .//arch/arm/mm/Kconfig:	depends on CPU_BIG_ENDIAN
>>   .//arch/arm64/Kconfig:	depends on OF && !CPU_BIG_ENDIAN
>>   .//arch/mips/Kconfig:	depends on SYS_SUPPORTS_BIG_ENDIAN
>>   .//arch/mips/Kconfig:	depends on SYS_SUPPORTS_LITTLE_ENDIAN
>>   .//arch/mips/Kconfig:	depends on SGI_IP22 || SGI_IP28 || (SNI_RM && CPU_LITTLE_ENDIAN)
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on !CPU_LITTLE_ENDIAN
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN
>>   .//arch/powerpc/platforms/Kconfig.cputype:	depends on CPU_LITTLE_ENDIAN
>>   [...]
>>   .//crypto/Kconfig:	depends on ARM && KERNEL_MODE_NEON && !CPU_BIG_ENDIAN
>>   .//crypto/Kconfig:	depends on ARM && KERNEL_MODE_NEON && !CPU_BIG_ENDIAN
>>   .//drivers/crypto/Kconfig:	depends on PPC64 && IBMVIO && !CPU_LITTLE_ENDIAN
>>   [...]
>>
>> It is a simple search, so I am not sure whether have other modules also
>> need LE or BE.
>>
> 
> Thanks.
> 


-- 
Chen Gang

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