linux-kernel - [PATCH tip/core/rcu 0/4] Review comments, cleanups, and preemptable synchronize

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Date:	Sun, 13 Sep 2009 09:14:38 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu
Subject: [PATCH tip/core/rcu 0/4] Review comments, cleanups, and
	preemptable synchronize_rcu() fixes

This patchset provides updates to TREE_PREEMPT_RCU as follows:

1.	Update the TREE_PREEMPT_RCU description to note that it is
	suitable for small machines.

2.	Add some WARN_ON_ONCE() calls to check for (incorrect)
	concurrent grace-period initialization.

3.	Simplify quiescent-state detection (which also speeds up
	TREE_PREEMPT_RCU grace periods slightly).

4.	Fix a thinko in TREE_PREEMPT_RCU's synchronize_rcu() that
	could result in premature grace periods.
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