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Date: Sat, 23 Jun 2012 15:57:44 -0700 From: Randy Dunlap <rdunlap@...otime.net> To: "H.J. Lu" <hjl.tools@...il.com> CC: "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: PATCH] Use -mpreferred-stack-boundary=3 on x86-64 if supported On 06/23/2012 09:49 AM, H.J. Lu wrote: > On Sat, Jun 23, 2012 at 9:17 AM, H. Peter Anvin <hpa@...or.com> wrote: >> To keep gcc from paddong the stack to maintain a nonexistent alignment. >> >> Andi Kleen <andi@...stfloor.org> wrote: >> >>>> This patch uses -mpreferred-stack-boundary=3 on x86-64 if it is >>> supported. >>>> I have been running 3.4 kernel compiled with this option for weeks. >>> >>> But why? >>> >>> All the SSE code in the kernel should adjust manually. And the other >>> code doesn't need it. >>> >>> Besides the entry points do not guarantee alignment. >>> >>> For the kernel it would be probably more useful to have a attribute >>> per function that forces alignment. > > There was an attempt from you to do it in 2007: > > http://lkml.indiana.edu/hypermail/linux/kernel/0708.2/2604.html > http://gcc.gnu.org/ml/gcc-patches/2007-07/msg01697.html > > But the gcc patch was never checked in. > > Some (most) of this explanation needs to be in the patch description. -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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