Commit-ID: 5c60d25fa1b22fdcf141f8006d31c32b08db7311
Gitweb: http://git.kernel.org/tip/5c60d25fa1b22fdcf141f8006d31c32b08db7311
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 9 Feb 2015 05:37:47 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 12 Mar 2015 15:19:38 -0700
rcu: Add diagnostics to grace-period cleanup
At grace-period initialization time, RCU checks that all quiescent
states were really reported for the previous grace period. Now that
grace-period cleanup has been split out of grace-period initialization,
this commit also performs those checks at grace-period cleanup time.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index d5247ed..17b5abf 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1920,6 +1920,8 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
rcu_for_each_node_breadth_first(rsp, rnp) {
raw_spin_lock_irq(&rnp->lock);
smp_mb__after_unlock_lock();
+ WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp));
+ WARN_ON_ONCE(rnp->qsmask);
ACCESS_ONCE(rnp->completed) = rsp->gpnum;
rdp = this_cpu_ptr(rsp->rda);
if (rnp == rdp->mynode)
--
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