linux-kernel - Re: asm-x86/byteorder.h, CONFIG_X86

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Date:	Sat, 26 Jul 2008 09:59:01 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Olaf Hering <olaf@...fle.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: asm-x86/byteorder.h, CONFIG_X86_BSWAP leaks to userland

On Sat, 26 Jul 2008 12:48:31 -0400
"H. Peter Anvin" <hpa@...or.com> w
> > I'm not sure if it's time yet to make the bswap ones be exported,
> > as they would no longer be usable for those early machines.  X86
> > guys CC:d.
> 
> On i386 we still default to i386-compatible binaries; I *think* gcc
> has macros telling you if the user has used -march=i486 etc.

It is also not the kernels job to provide this sort of functionality to
userspace programs. At all. This is gcc/glibc/etc's job.

Rule of thumb: the kernel does not provide code for compiling inside
userspace programs.

(As opposed to providing datastructures that userspace programs can use
to talk to the kernel).



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