Commit-ID: f34c8585ed70f0f9b5ff9cf59c0dd533cddb975f
Gitweb: http://git.kernel.org/tip/f34c8585ed70f0f9b5ff9cf59c0dd533cddb975f
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 20 Jul 2017 15:27:32 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 24 Jul 2017 16:04:19 -0700
rcutorture: Invoke call_rcu() from timer handler
The Linux kernel invokes call_rcu() from various interrupt/softirq
handlers, but rcutorture does not. This commit therefore adds this
behavior to rcutorture's repertoire.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/rcutorture.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 6e3f644..0efd69b 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1080,6 +1080,11 @@ rcu_torture_fakewriter(void *arg)
return 0;
}
+static void rcu_torture_timer_cb(struct rcu_head *rhp)
+{
+ kfree(rhp);
+}
+
/*
* RCU torture reader from timer handler. Dereferences rcu_torture_current,
* incrementing the corresponding element of the pipeline array. The
@@ -1142,6 +1147,14 @@ static void rcu_torture_timer(unsigned long unused)
__this_cpu_inc(rcu_torture_batch[completed]);
preempt_enable();
cur_ops->readunlock(idx);
+
+ /* Test call_rcu() invocation from interrupt handler. */
+ if (cur_ops->call) {
+ struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_NOWAIT);
+
+ if (rhp)
+ cur_ops->call(rhp, rcu_torture_timer_cb);
+ }
}
/*
--
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