[Question] one question about 'current' in scheduler_tick()

Hi, All.

I found scheduler_tick() use current macro to get task_struct of current task. I seen scheduler_tick() is called every timer interrupt at most time. In this case, I think scheduler_tick() is in interrupt context (enter kernel by interrupt), So I have a hunch that there have not thread_info which it need in kernel stack. But

It seem it can work perfectly.

I can not understand this. Would any expert like explain clearly for it ?

   Thanks in advanced.

-liyu

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