linux-kernel - Re: [PATCH RFC] rcu: Make __rcu_read

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Message-ID: <1332851167.23924.125.camel@gandalf.stny.rr.com>
Date:	Tue, 27 Mar 2012 08:26:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, patches@...aro.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH RFC] rcu: Make __rcu_read_lock() inlinable

On Mon, 2012-03-26 at 22:15 -0700, Paul E. McKenney wrote:

> Hmmm...  I am not yet sure whether it is easier to make RCU use legal
> in switch_to() or to detect it.  I am inclined to take whatever course
> is easiest, which is likely to make it legal.  :-/

We could just declare that we do not allow tracepoints in arch specific
"switch_to" code. Then you shouldn't need to worry about RCU in
switch_to().

sched_rcu can still work there correct? That is, a synchronize_sched()
should not be affected. As that is needed for the function tracing, and
that may be called within a switch_to.

-- Steve


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