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Interrupt time handling

hi,all
In LDD2 Chapter6 "Flow of Time", it says "When running in interrupt mode" code 
is subject to a number of constraints, one of which is "The current pointer 
is not valid in interrupt mode, and cannot be used".

But in the timer interrupt handler do_timer()-->update_process_times(), the 
"current" is explicitly referenced.

Anyone explains this ?

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