linux-kernel - Re: [mingo@...e.hu: [git pull] headers

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Message-ID: <4980CD51.70601@zytor.com>
Date:	Wed, 28 Jan 2009 13:25:37 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Jaswinder Singh Rajput <jaswinderrajput@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [mingo@...e.hu: [git pull] headers_check fixes]

Harvey Harrison wrote:
> 
> For now, the problem is with arches like X86 that need to test the availability of
> an instruction.  So the arch versions could be unconditionally offered on X86_64
> and the lowest-common denominator (no BSWAP) on X86-32.  If we still want the
> optimized (BSWAP) versions on X86-32 the tests will have to use the compiler arch flags
> as opposed to CONFIG_BSWAP....which is probably not worth the trouble.
> 

Well, that's how the headers were originally written, I believe.

CONFIG_BSWAP can be replaced with the __i486__ macro, and since most 
distros compile for i586 or i686 these days, it might actually make 
sense for this one particular case.

	-hpa

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