linux-kernel - Re: [PATCH 0/5] call_rcu

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Message-Id: <20080414183312.eba58a41.akpm@linux-foundation.org>
Date:	Mon, 14 Apr 2008 18:33:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	mingo@...e.hu, hch@...radead.org, mmlnx@...ibm.com,
	dipankar@...ibm.com, dsmith@...hat.com, rostedt@...dmis.org,
	adrian.bunk@...ial.fi, a.p.zijlstra@...llo.nl, ego@...ibm.com,
	niv@...ibm.com, dvhltc@...ibm.com, rusty@....ibm.com,
	jkenisto@...ux.vnet.ibm.com, oleg@...sign.ru,
	jamesclhuang@...oo.com
Subject: Re: [PATCH 0/5] call_rcu_sched() series

On Sun, 13 Apr 2008 20:58:48 -0700 "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> This series adds call_rcu_sched(), applies some fixes to RCU Classic,
> adds rcu_barrier_sched(), updates rcutorture, and updates the RCU
> documentation.

Some massaging was needed here to make these apply against the
RCU changes in git-sched.

All fairly simple, except I don't know if these:

static inline void rcu_enter_nohz(void)
{
	smp_mb(); /* CPUs seeing ++ must see prior RCU read-side crit sects */
	__get_cpu_var(rcu_dyntick_sched).dynticks++;
	WARN_ON(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1);
}

static inline void rcu_exit_nohz(void)
{
	__get_cpu_var(rcu_dyntick_sched).dynticks++;
	smp_mb(); /* CPUs seeing ++ must see later RCU read-side crit sects */
	WARN_ON(!(__get_cpu_var(rcu_dyntick_sched).dynticks & 0x1));
}

in include/linux/rcupreempt.h ended up the way we want them?
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