sys_getcpu
asmlinkage long sys_getcpu(unsigned __user *cpu, unsigned __user *node, void __user *cache);
__SYSCALL(__NR_getcpu, sys_getcpu)
__SYSCALL(__NR_getcpu, sys_getcpu)
r = sys_getcpu(&cpu, NULL);
ret = sys_getcpu(&cpu_id, &node_id);
ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);