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 <torva...@linux-foundation.org> > Signed-off-by: Stephane Eranian <eran...@google.com> > ---
Is this needed for the 3.8 or older kernels as well? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
