linux-kernel - Re: PATCH] Use -mpreferred-stack-boundary=3 on x86-64 if supported

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Message-ID: <20120623192704.GT11413@one.firstfloor.org>
Date:	Sat, 23 Jun 2012 21:27:04 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>, "H.J. Lu" <hjl.tools@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: PATCH] Use -mpreferred-stack-boundary=3 on x86-64 if supported

On Sat, Jun 23, 2012 at 09:17:06AM -0700, H. Peter Anvin wrote:
> To keep gcc from paddong the stack to maintain a nonexistent alignment.


Ah ok. 3 instead of 4.

I thought i had done that a long time ago, but now it somehow
only seems to be there for 32bit.

Makes sense.

-Andi
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