linux-kernel - Re: asm-x86/byteorder.h: clean up for userspace

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Message-ID: <477AF560.1000002@zytor.com>
Date:	Tue, 01 Jan 2008 18:22:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Christoph Hellwig <hch@...radead.org>,
	Mike Frysinger <vapier@...too.org>, tglx@...utronix.de,
	mingo@...hat.com, Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: asm-x86/byteorder.h: clean up for userspace

Adrian Bunk wrote:
> 
> Userspace either has to #define CONFIG_X86_BSWAP or it'll get the slow 
> versions of these functions...
> 
> Leaking CONFIG_ variables to userspace is not really funny - I remember 
> e.g. what tricks MySQL does (did?) for (ab)using asm-i386/atomic.h in 
> userspace.
> 

True.  CONFIG_X86_BSWAP isn't appropriate for userspace anyway, 
userspace needs to use the appropriate gcc intrinsics for 486+.

	-hpa
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