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Date: Fri, 20 Jul 2007 12:29:22 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andi Kleen <ak@suse.de>
CC: Andreas Schwab <schwab@suse.de>, "Luck, Tony" <tony.luck@intel.com>,
       Randy Dunlap <randy.dunlap@oracle.com>,
       Arthur Jones <arthur.jones@qlogic.com>,
       Vasily Tarasov <vtaras@openvz.org>, linux-kernel@vger.kernel.org,
       Jan Kara <jack@ucw.cz>, linux-arch@vger.kernel.org
Subject: Re: build fix for x86_64...
References: <617E1C2C70743745A92448908E030B2A01FA46A9@scsmsx411.amr.corp.intel.com> <jezm1rq8gz.fsf@sykes.suse.de> <46A0F4AC.50809@zytor.com> <200707202013.03568.ak@suse.de>
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Andi Kleen wrote:
>> Obviously, this is not a panacea; if the original "struct foo" has also
>> been introduced on 64 bits before the bug is caught, 
> 
> That's usually the case. There is already an established 64bit ABI
> 

This is true.

Kind of makes me wonder if the right thing is to introduce an
"interface" 64-bit type, call it __iu64 (__is64) defined as:

typedef __u64 __attribute__((aligned(8))) __iu64;
typedef __s64 __attribute__((aligned(8))) __is64;

... and encourage people to use it when creating new interfaces.

Don't know if that would do any good.

	-hpa