Re: [PATCH] ACPI: bind workqueues to CPU 0 to avoid SMI corruption

Rafael J. Wysocki
2009-08-01T11:00:58Z

On Saturday 01 August 2009, Bjorn Helgaas wrote:
> On Wednesday 29 July 2009 06:59:59 pm Zhang Rui wrote:
> > On Thu, 2009-07-30 at 05:54 +0800, Bjorn Helgaas wrote:
> > > On some machines, a software-initiated SMI causes corruption unless the
> > > SMI runs on CPU 0. An SMI can be initiated by any AML, but typically it's
> > > done in GPE-related methods that are run via workqueues, so we can avoid
> > > the known corruption cases by binding the workqueues to CPU 0.
> > >
> > > References:
> > > http://bugzilla.kernel.org/show_bug.cgi?id=13751
> > > https://bugs.launchpad.net/bugs/157171
> > > https://bugs.launchpad.net/bugs/157691
> > >
> > > Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
> >
> > Acked-by: Zhang Rui <rui.zhang@intel.com>
>
> In addition to the reports above, I think it's likely this patch
> will fix the problems reported below:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=13412
> http://bugzilla.kernel.org/show_bug.cgi?id=11259
> http://bugzilla.kernel.org/show_bug.cgi?id=12328
> http://bugzilla.kernel.org/show_bug.cgi?id=12106
>
> I think we should consider this patch for 2.6.31.
>
> (Rafael, 13751 is on your "2.6.29 -> 2.6.30" regression list.
> I actually think it's been around much longer than that, but
> there seem to be many things that affect whether it manifests.)

I've dropped it from the list, thanks.

Best,
Rafael