linux-kernel - Re: [PATCH 2/6] rcu: Allow rcu_user

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Message-ID: <4FF9AD2A.1000901@redhat.com>
Date:	Sun, 08 Jul 2012 18:54:18 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/6] rcu: Allow rcu_user_enter()/exit() to nest

On 07/06/2012 03:00 PM, Frederic Weisbecker wrote:
> Allow calls to rcu_user_enter() even if we are already
> in userspace (as seen by RCU) and allow calls to rcu_user_exit()
> even if we are already in the kernel.
> 
> This makes the APIs more flexible to be called from architectures.
> Exception entries for example won't need to know if they come from
> userspace before calling rcu_user_exit().

I guess I should switch kvm to rcu_user_enter() and co, so we can
disable the tick while running in a guest.  But where are those
functions?  What are the rules for calling them?

-- 
error compiling committee.c: too many arguments to function


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