SRCU: Question on srcu_advance_state

["Zhang,Qiang" <qiang.zhang@xxxxxxxxxxxxx>]

Hello Pual

sorry to disturb you, I also have some quesetion for you:

in srcu_advance_state function, when seq state == SRCU_STATE_SCAN1, we 
will check, if the previous readers critical region exits, will be 
returned directly.

I'd like to know under what scenario this will happen?

Thanks
Qiang