Re: Question about x86/mm/gup.c's use of disabled interrupts

[Jeremy Fitzhardinge]

Paul E. McKenney wrote:
> > Ah, interesting.  So disabling interrupts prevents the RCU free from 
> > happening, and non-atomic pte fetching is a non-issue.  So it doesn't 
> > address the PAE side of the problem.
> >     
>
> This would be rcu_sched, correct?
>   

I guess?  Whatever it is that ends up calling all the rcu callbacks 
after the idle.  A cpu with disabled interrupts can't go through idle, 
right?  Or is there an explicit way to hold off rcu?

   J
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