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x86: Use this_cpu_inc_return for nmi counter
this_cpu_inc_return() saves us a memory access there. Reviewed-by: Pekka Enberg <penberg@kernel.org> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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