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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-08-21 15:00:05 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-09-23 07:41:56 -0700
commitd7d6a11e8609f0319d4a2d8ede348f8b3374b652 (patch)
tree64a2e3260690a85fe637a3e34c94e8ca540e8fc6 /kernel/rcutree.h
parent1943c89de700248d68385300a9b5588a1e314f90 (diff)
downloadop-kernel-dev-d7d6a11e8609f0319d4a2d8ede348f8b3374b652.zip
op-kernel-dev-d7d6a11e8609f0319d4a2d8ede348f8b3374b652.tar.gz
rcu: Simplify quiescent-state detection
The current quiescent-state detection algorithm is needlessly complex. It records the grace-period number corresponding to the quiescent state at the time of the quiescent state, which works, but it seems better to simply erase any record of previous quiescent states at the time that the CPU notices the new grace period. This has the further advantage of removing another piece of RCU for which lockless reasoning is required. Therefore, this commit makes this change. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcutree.h')
-rw-r--r--kernel/rcutree.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 8f0293c..935dd4c 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -246,8 +246,6 @@ struct rcu_data {
/* in order to detect GP end. */
unsigned long gpnum; /* Highest gp number that this CPU */
/* is aware of having started. */
- unsigned long passed_quiesce_gpnum;
- /* gpnum at time of quiescent state. */
bool passed_quiesce; /* User-mode/idle loop etc. */
bool qs_pending; /* Core waits for quiesc state. */
bool beenonline; /* CPU online at least once. */
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