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From: Ingo Molnar on 8 Jul 2010 03:20

* Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> wrote:

> * Ma, Ling (ling.ma(a)intel.com) wrote:
> > Hi Mathieu
> >
> > I did git revert as bellow
> > Revert "x86, mem: Optimize memcpy by avoiding memory false dependece"
> >
> > This reverts commit 77ff5e49c20bb72a99a12bfb00dbf90b2302f087.
> > And I found the machine will crash with your config file
> >
> > Could you revert the patch : 77ff5e49c20bb72a99a12bfb00dbf90b2302f087 on your
> > machine, and check it again ?
>
> Hi Ling,
>
> I just successfully booted my machine 3 times in a row with a revert of
> commit a1e5278e40f16a4611264f8da9e557c16cb6f6ed from -tip. This is actually
> the same as reverting commit 77ff5e49c20bb72a99a12bfb00dbf90b2302f087, as
> a1e5278e40f16a4611264f8da9e557c16cb6f6ed is simply a merge of that commit
> (the diffs are exactly the same).
>
> Without this revert, the machine gets to:

Please check latest -tip (2a74852 or later), the commit should be gone now.

There's clearly some (boundary-condition?) bug in the assembly code of
77ff5e49c2.

Thanks,

Ingo
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