From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Thu, 12 Dec 2013 15:43:09 +0000
Subject: gcc miscompiles csum_tcpudp_magic() on ARMv5
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Message-ID: <20131212154309.GR4360@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thu, Dec 12, 2013 at 04:28:49PM +0100, Willy Tarreau wrote:
> On Thu, Dec 12, 2013 at 03:18:18PM +0000, M?ns Rullg?rd wrote:
> > The ABI for function calls sign/zero-extends all arguments prior to the
> > call.
> 
> OK then that's pretty clear, there's no ambiguity, thanks for the precision.

Let's be clear about this: there is no GCC bug here - the kernel code
unfortunately what is buggy.  asm() input arguments are not subject to
this promotion irrespective of the ABI.