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
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