x86: make nmi_cpu_busy() always defined
nmi_cpu_busy() must be available on !SMP too.
this is in preparation to a smp_call_function_mask() fix.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
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nmi_cpu_busy() must be available on !SMP too.
this is in preparation to a smp_call_function_mask() fix.
Signed-off-by: NIngo Molnar <mingo@elte.hu>