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/** * idle_threads_init - Initialize idle threads for all cpus */void __init idle_threads_init(void){ unsigned int cpu, boot_cpu;  boot_cpu = smp_processor_id();  for_each_possible_cpu(cpu) {  if (cpu != boot_cpu)   idle_init(cpu); }}

static inline void idle_init(unsigned int cpu){ struct task_struct *tsk = per_cpu(idle_threads, cpu);  if (!tsk) {  tsk = fork_idle(cpu);  if (IS_ERR(tsk))   pr_err("SMP: fork_idle() failed for CPU %u\n", cpu);  else   per_cpu(idle_threads, cpu) = tsk; }}

struct task_struct *fork_idle(int cpu){ struct task_struct *task; task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0, 0,       cpu_to_node(cpu)); if (!IS_ERR(task)) {  init_idle_pids(task->pids);  init_idle(task, cpu); }  return task;}

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