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Subject: Re: [PATCH 09/10] x86-32: use SSE for atomic64_read/set if available
From: Luca Barbieri <luca@luca-barbieri.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org,
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> 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).