Date: Sat, 26 Jul 2008 09:59:01 -0700
From: Arjan van de Ven <arjan@infradead.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Harvey Harrison <harvey.harrison@gmail.com>, Olaf Hering <olaf@aepfle.de>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: asm-x86/byteorder.h, CONFIG_X86_BSWAP leaks to userland
Message-ID: <20080726095901.4a06daf9@infradead.org>
In-Reply-To: <488B555F.4090709@zytor.com>
References: <20080726013931.bcc4682d.akpm@linux-foundation.org>
	<1217090446.5971.57.camel@brick>
	<488B555F.4090709@zytor.com>
Organization: Intel
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1085
Lines: 29

On Sat, 26 Jul 2008 12:48:31 -0400
"H. Peter Anvin" <hpa@zytor.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).


-- 
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/