On Fri, Mar 15, 2013 at 2:31 PM, Greg KH <gre...@linuxfoundation.org> 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 <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
Just about to ask the same question. Patch applies to 3.8, 3.4, 3.2 and 3.5. But needs some massaging for 3.0. I have the kernels built, haven't started testing yet. -- Shuah -- 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/
