linux-kernel - Re: [patch 2/2] x86: lds - Use THREAD

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Date:	Mon, 18 Feb 2008 15:27:22 +0100
From:	Andi Kleen <ak@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Cyrill Gorcunov <gorcunov@...il.com>,
	Sam Ravnborg <sam@...nborg.org>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] x86: lds - Use THREAD_SIZE instead of numeric	constant

> You're saying that it *must* be aligned, I don't think that's true 
> anymore; I think nowadays it's more accurate to say that it *is* 
> aligned, but I don't think that's fundamental.

At least in .25 mainline current_thread_info() is still using
[re]sp arithmetic.  Also I think the stack backtracers also
rely on suitable alignment of the stack top. So right now it is still 
fundamental. Now that could be all fixed by using segment
register references and might be, but so far that doesn't
seem to be finished yet.

-Andi
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