nmi_callback = callback; 
rcu_assign_pointer(nmi_callback, callback); 
void set_nmi_callback(nmi_callback_t callback){	nmi_callback = callback;}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/19306059cd7fedaf96b4b0260a9a8a45e513c857/traps.c/clean/arch/i386/kernel/traps.c