On Fri, Mar 15, 2013 at 09:49:00PM +0100, Stephane Eranian wrote: > On Fri, Mar 15, 2013 at 9:31 PM, Greg KH <[email protected]> wrote: > > > > On Fri, Mar 15, 2013 at 02:26:07PM +0100, Stephane Eranian wrote: > > > > > > This patch fixes a kernel crash when using precise sampling (PEBS) > > > after a suspend/resume. Turns out the CPU notifier code is not invoked > > > on CPU0 (BP). Therefore, the DS_AREA (used by PEBS) is not restored > > > properly > > > by the kernel and keeps it power-on/resume value of 0 causing any PEBS > > > measurement to crash when running on CPU0. > > > > > > The workaround is to add a hook in the actual resume code to restore > > > the DS Area MSR value. It is invoked for all CPUS. So for all but CPU0, > > > the DS_AREA will be restored twice but this is harmless. > > > > > > Reported-by: Linus Torvalds <[email protected]> > > > Signed-off-by: Stephane Eranian <[email protected]> > > > --- > > > > Is this needed for the 3.8 or older kernels as well? > > > I suspect so. If CPU0 is not covered by the cpu notifiers > then yes, the patch is needed.
Ok, thanks, I've queued it up now there. greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
