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

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Message-ID: <7d9b7b08-77e8-4757-b8fb-f42ba53bded4@email.android.com>
Date:	Sat, 23 Jun 2012 12:45:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"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

Yes, it didn't work on 64 bits until now.

Andi Kleen <andi@...stfloor.org> wrote:

>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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