linux kernel per_cpu变量使用实例

mytest_struct_t *var;
unsigned int cpu;

//变量申请
var = alloc_percpu(mytest_struct_t);
if (var == NULL) {
    return -ENMEM;
}

//提取变量
for_each_possible_cpu(cpu) {
    var = per_cpu_ptr(var, cpu);
}

//free var
if (var) {
    free_percpu(var);
    var = NULL;
}