linux-kernel - Re: gas 2.16 and assembly macros -- entry

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Date:	Fri, 01 Oct 2010 10:21:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Ingo Molnar <mingo@...e.hu>, heukelum@...tmail.fm,
	tglx@...utronix.de, akpm@...ux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: gas 2.16 and assembly macros -- entry_64.S build failure

On 10/01/2010 08:46 AM, Jan Beulich wrote:
> 
> Perhaps a misunderstanding? I meant to move the % back into
> movq_cfi's arguments, out of the macro body. pushq_cfi already
> is in the shape we need for having the option of using cpp macros
> when !CONFIG_AS_CFI.
> 

Hm... I guess I'm not quite following.  I don't really see how that
would help with movq_cfi, though?

>>> The other alternative, albeit disliked by Ingo, continues to be to use
>>> __stringify() on all non-trivial operands, which then wouldn't require
>>> suppressing CONFIG_AS_CFI for pre-2.17 binutils.
>>
>> You should be taken out and shot for even thinking that, never mind
>> putting it in writing...
> 
> Thank you!

Just in case the intended sarcasm didn't read... I was of course joking,
although in all seriousness the __stringify() truly is
stick-your-eyes-out ugly and is just begging for future problems.  It
really isn't an option.

	-hpa
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