x86, NMI: Allow NMI reason io port (0x61) to be processed on any CPU
In original NMI handler, NMI reason io port (0x61) is only processed on BSP. This makes it impossible to hot-remove BSP. To solve the issue, a raw spinlock is used to allow the port to be processed on any CPU. Originally-by: NHuang Ying <ying.huang@intel.com> Signed-off-by: NDon Zickus <dzickus@redhat.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1294348732-15030-6-git-send-email-dzickus@redhat.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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