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Date: Fri, 15 Mar 2013 13:31:23 -0700 From: Greg KH <gregkh@...uxfoundation.org> To: Stephane Eranian <eranian@...gle.com> Cc: linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, peterz@...radead.org, mingo@...e.hu, tglx@...utronix.de, akpm@...ux-foundation.org, acme@...hat.com, jolsa@...hat.com, ak@...ux.intel.com Subject: Re: [PATCH] perf,x86: fix kernel crash with PEBS/BTS after suspend/resume 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 <torvalds@...ux-foundation.org> > Signed-off-by: Stephane Eranian <eranian@...gle.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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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