cpu_entry_stack
wrmsrq(MSR_IA32_SYSENTER_ESP, (unsigned long)(cpu_entry_stack(cpu) + 1));
(unsigned long)(cpu_entry_stack(smp_processor_id()) + 1));
load_sp0((unsigned long)(cpu_entry_stack(cpu) + 1));
struct entry_stack *ss = cpu_entry_stack(smp_processor_id());
(unsigned long)(cpu_entry_stack(cpu) + 1));