文章目录 作用初始化定义接口参考 作用 初始化 // in kernel/cpu.c void __init boot_cpu_init(void) {int cpu = smp_processor_id();set_cpu_online(cpu, true);set_cpu_active(cpu, true);set_cpu_present(cpu, true);set_cpu_possible(cpu, true); #ifdef CONFIG_SMP__boot_cpu_id = cpu; #endif } 定义 include/linux/cpumask.h typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; 即为typedef struct cpumask { unsigned long bits[BITS_TO_LONGS(NR_CPUS)] } cpumask_t; kernel/cpu.c struct cpumask __cpu_possible_mask __read_mostly; EXPORT_SYMBOL(__cpu_possible_mask); struct cpumask __cpu_online_mask __read_mostly; EXPORT_SYMBOL(__cp