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Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast() implementation

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From: Paul E. McKenney
Subject: Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast() implementation
Date: Friday, April 16, 2010 - 6:43 am

On Fri, Apr 16, 2010 at 04:54:51PM +1000, Benjamin Herrenschmidt wrote:

From the perspective of call_rcu_sched() and synchronize_sched(),
the following things mark RCU-sched read-side critical sections:

1.	rcu_read_lock_sched() and rcu_read_unlock_sched().

2.	preempt_disable() and preempt_enable(), along with anything
	else that disables preemption.

3.	local_bh_disable() and local_bh_enable(), along with anything
	else that disables bottom halves.

4.	local_irq_disable() and local_irq_enable(), along wiht anything
	else that disables hardirqs.

5.	Handlers for NMIs.

So I believe that in this case call_rcu_sched() is your friend.  ;-)

							Thanx, Paul
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Messages in current thread:
[PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast() i ..., Peter Zijlstra, (Thu Apr 8, 12:17 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Rik van Riel, (Thu Apr 8, 1:31 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Nick Piggin, (Thu Apr 8, 8:11 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Benjamin Herrenschmidt, (Mon Apr 12, 6:05 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Mon Apr 12, 8:43 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Wed Apr 14, 6:51 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Thu Apr 15, 7:28 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Benjamin Herrenschmidt, (Thu Apr 15, 11:51 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Benjamin Herrenschmidt, (Thu Apr 15, 11:54 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Nick Piggin, (Fri Apr 16, 1:18 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Benjamin Herrenschmidt, (Fri Apr 16, 1:29 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Nick Piggin, (Fri Apr 16, 2:22 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 6:43 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Fri Apr 16, 6:51 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 7:17 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Fri Apr 16, 7:23 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 7:32 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Fri Apr 16, 7:56 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 8:09 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Fri Apr 16, 8:14 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 9:45 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Peter Zijlstra, (Fri Apr 16, 12:37 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Fri Apr 16, 1:28 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Benjamin Herrenschmidt, (Fri Apr 16, 4:25 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., James Bottomley, (Sat Apr 17, 8:06 pm)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., Paul E. McKenney, (Sun Apr 18, 6:55 am)
Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast ..., James Bottomley, (Sun Apr 18, 11:55 am)