linux-kernel - Re: [PATCH 09/10] x86-32: use SSE for atomic64

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Message-ID: <ff13bc9a1002180545y219321acs7b9b348ddcb18f51@mail.gmail.com>
Date:	Thu, 18 Feb 2010 14:45:40 +0100
From:	Luca Barbieri <luca@...a-barbieri.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...e.hu, hpa@...or.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] x86-32: use SSE for atomic64_read/set if available

> Depends on where on the stack you're going to save things, I through
> you'd take space in the thread_info struct, but I guess if you're simply
> going to push the reg onto the stack it should be fine.

Yes, this seems the best solution.
With frame pointers enabled, it's just a single andl $-8, %esp to
align the stack (otherwise, frame pointers are forced by gcc).
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