> Rock Lee <rocklee_104@xxxxxxxxxxx> writes:
>
>> Hi, all:
>> Here is a snippet of linux-v3.4 which drives me crazy.
>> Because init_task hasn't been declared yet when init_thread_union is
>> initializing. Why is there no compiling error? Any hint would be helpful.
>>
>> union thread_union init_thread_union __init_task_data =
>>
>> { INIT_THREAD_INFO(init_task) };
>>
>>
>>
>> /*
>>
>> * Initial task structure.
>>
>> *
>>
>> * All other task structs will be allocated on slabs in fork.c
>>
>> */
>>
>> struct task_struct init_task = INIT_TASK(init_task);
>
>
> Because init_task is declared "extern" in linux/sched.h
>
>
> Bjørn
I do something like that:
extern int b;
int a = b + 10;
int b = 20;
int main(void)
{
return 0;
}
No doubt, compiling error.
--
Rock Lee
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