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rcu: update documentation/comments for Lai's adoption patch

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Lai's RCU-callback immediate-adoption patch changes the RCU tracing
output, so update tracing.txt.  Also update a few comments to clarify
the synchronization design.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2010-10-20 12:06:18 -07:00
parent 29494be71a
commit 2d999e03b7
3 changed files with 11 additions and 13 deletions
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10
kernel/rcutree.c
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@ -1668,7 +1668,9 @@ static void _rcu_barrier(struct rcu_state *rsp,
* decrement rcu_barrier_cpu_count -- otherwise the first CPU
* might complete its grace period before all of the other CPUs
* did their increment, causing this function to return too
* early.
* early. Note that on_each_cpu() disables irqs, which prevents
* any CPUs from coming online or going offline until each online
* CPU has queued its RCU-barrier callback.
*/
atomic_set(&rcu_barrier_cpu_count, 1);
on_each_cpu(rcu_barrier_func, (void *)call_rcu_func, 1);
@ -1797,9 +1799,9 @@ static int __cpuinit rcu_cpu_notify(struct notifier_block *self,
case CPU_DYING:
case CPU_DYING_FROZEN:
/*
* The whole machine is "stopped" except this cpu, so we can
* touch any data without introducing corruption. And we send
* the callbacks to an attribute chosen online cpu.
* The whole machine is "stopped" except this CPU, so we can
* touch any data without introducing corruption. We send the
* dying CPU's callbacks to an arbitrarily chosen online CPU.
*/
rcu_send_cbs_to_online(&rcu_bh_state);
rcu_send_cbs_to_online(&rcu_sched_state);