linux-kernel - Re: [PATCH RFC tip/core/rcu 21/41] rcu: Inform RCU of irq

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Date:	Thu, 2 Feb 2012 09:30:39 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH RFC tip/core/rcu 21/41] rcu: Inform RCU of irq_exit()
 activity

On Wed, Feb 01, 2012 at 06:30:33PM -0800, Josh Triplett wrote:
> On Wed, Feb 01, 2012 at 11:41:39AM -0800, Paul E. McKenney wrote:
> > [ Alternatively, delaying the ->rcu_read_lock_nesting decrement
> >   until after the special handling would make the thing more robust
> >   in the face of interrupts as well.  And there is a separate patch
> >   for that. ]
> 
> Where does that separate patch live, and should it replace this one?

It is #18 in this series: "rcu: Protect __rcu_read_unlock() against
scheduler-using irq handlers".  Both are needed.  I will rework the
commit message appropriately.

							Thanx, Paul

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