x86/topology: Handle CPUID bogosity gracefully
Joseph reported that a XEN guest dies with a division by 0 in the package topology setup code. This happens if cpu_info.x86_max_cores is zero. Handle that case and emit a warning. This does not fix the underlying XEN bug, but makes the code more robust. Reported-and-tested-by: NJoseph Salisbury <joseph.salisbury@canonical.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1605062046270.3540@nanosSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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