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

[liyu]

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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