linux-kernel - Re: [RFC,v2] x86_64: save

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Message-Id: <20081118234511.80C4F1544F1@magilla.localdomain>
Date:	Tue, 18 Nov 2008 15:45:11 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Jan Beulich <jbeulich@...ell.com>,
	heukelum@...tmail.fm, Thomas Gleixner <tglx@...utronix.de>,
	Alexander van Heukelum <heukelum@...lshack.com>,
	Glauber Costa <gcosta@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC,v2] x86_64: save_args out of line

Yes, I mean a single macro that produces both the instruction and the CFI
pseudo-op to go with it.  This is the essential characteristic that makes
it an improvement for maintaining the code.  The main problem we have now
is that it's easy to write/modify plain assembly instructions and forget to
add or update the CFI to match.  A well-considered set of macros can solve
this without making it any harder for the average assembly programmer to
understand what each line of the source means intuitively.

Thanks,
Roland
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