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SubjectRe: [PATCH -tip] Revert x86, mem: Optimize memcpy by avoiding memory false dependece
* Ingo Molnar (mingo@elte.hu) wrote:
>
> * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
>
> > * Ma, Ling (ling.ma@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.

Will do, thanks!

Mathieu

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

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com


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