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

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Date:	Fri, 20 Mar 2009 08:38:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	paulmck@...ux.vnet.ibm.com
CC:	Nick Piggin <nickpiggin@...oo.com.au>, Avi Kivity <avi@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jan Beulich <jbeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: Question about x86/mm/gup.c's use of disabled interrupts

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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