this_cpu_add_2
#define this_cpu_add_2(pcp, val) \
#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
#define this_cpu_add_2(pcp, val) percpu_add_op(2, volatile, (pcp), val)
#define this_cpu_add_2(pcp, val) this_cpu_generic_to_op(pcp, val, +=)