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

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Date:	Sun, 12 Aug 2007 10:56:21 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <ak@...e.de>
cc:	Petr Vandrovec <petr@...drovec.name>, discuss@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix triplefault on x86-64 bootup

On Sun, 12 Aug 2007, Andi Kleen wrote:
> 
> Can you please just apply the patch series please? 
> This one is fixed in  "Make patching more robust, fix paravirt issue"

I *had* applied the patch series, Andi. And that one will do

	memcpy(addr, opcode, len);

even though "addr" itself may be all of memcpy().

So the code was buggy, and Petr fixed it, and your patch-series didn't fix 
*anything*. In fact, from what I can tell, it's the one that introduced 
the problem, because before thatone hit, we'd always do the two-byte 
sequence on its own (since the "nop_out()" on the rest of the memcpy would 
be called later, and separately, once it didn't matter any more).

So out of 12 patches, 2 caused machines to not even boot. Not good.

			Linus
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