linux-kernel - Re: [PATCH] Fix triplefault on x86-64 bootup

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Date:	12 Aug 2007 15:53:57 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Petr Vandrovec <petr@...drovec.name>, discuss@...-64.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH] Fix triplefault on x86-64 bootup

Alexey Dobriyan <adobriyan@...il.com> writes:

> On Sun, Aug 12, 2007 at 10:12:52AM +0200, Petr Vandrovec wrote:
> > --- a/arch/x86_64/lib/memcpy.S
> > +++ b/arch/x86_64/lib/memcpy.S
> > @@ -124,6 +124,8 @@ ENDPROC(__memcpy)
> >  	.quad memcpy
> >  	.quad 1b
> >  	.byte X86_FEATURE_REP_GOOD
> > -	.byte .Lfinal - memcpy
> > +	/* Replace only beginning, memcpy is used to apply alternatives, so it
> > +	 * is silly to overwrite itself with nops - reboot is only outcome... */
> > +	.byte 2b - 1b
> >  	.byte 2b - 1b
> >  	.previous
> 
> Thanks, this fixes E6400 reboots on bootup here.

Please test with only ab144f5ec64c42218a555ec1dbde6b60cf2982d6
applied (or rather a few patches back in the git history) 
I bet that fixes it already.

-Andi
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