linux-kernel - Re: [2.6 patch] asm-generic/int-ll64.h: always provide _

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Date:	Tue, 20 May 2008 03:33:15 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [2.6 patch] asm-generic/int-ll64.h: always provide __{s,u}64

On Mon, May 19, 2008 at 05:17:31PM -0700, H. Peter Anvin wrote:
> Adrian Bunk wrote:
>> On Mon, May 19, 2008 at 04:51:53PM -0700, H. Peter Anvin wrote:
>>> Adrian Bunk wrote:
>>>>> If it is going to be unconditionally offered, we could get rid of
>>>>> __BYTEORDER_HAS_U64__ as a next step.  Unless there is something I've
>>>>> missed.
>>>> Why do we need the byteorder headers in userspace at all?
>>>>
>>> Because Linux-specific software has depended on them for over 15 
>>> years  (they are a much better API than anything POSIX provides.)  We 
>>> can't  just yank them, and so it's better if they actually work.
>>>
>>> Yes, you can argue it should be glibc's job to provide them, but 
>>> well,  why duplicate work when we already have a nicely working set.
>>
>> The worst thing is how many CONFIG_'s they currently leak to userspace.
>>
>> And e.g. the versions in the x86 header are therefore not the fastest  
>> ones (unless the userspace software #define's CONFIG_X86_BSWAP)...
>>
>
> This is a valid point.  This should be __i486__ for userspace, which is  
> gcc's way to tell you if you're compiling with -march=i486.

This doesn't help if you're compiling with e.g. -march=pentium

> 	-hpa

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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