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[PATCH tip/core/rcu 13/13] rcutorture: Invoke call_rcu() from timer handler

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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@linux.vnet.ibm.com>
---
 kernel/rcu/rcutorture.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 6e3f644280ee..0efd69b2fb8c 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);
+	}
 }
 
 /*
-- 
2.5.2

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[PATCH tip/core/rcu 0/13] Torture-test updates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 09/13] rcutorture: Use nr_cpus rather than maxcpus to limit test size "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 11/13] rcutorture: Eliminate unused ts_rem local from rcu_trace_clock_local() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 12/13] rcu: Add last-CPU to GP-kthread starvation messages "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 13/13] rcutorture: Invoke call_rcu() from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 06/13] rcutorture: Don't wait for kernel when all builds fail "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 05/13] torture: Add --kconfig argument to kvm.sh "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 07/13] rcutorture: Enable SRCU readers from timer handler "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 01/13] rcutorture: Move SRCU status printing to SRCU implementations "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 08/13] rcutorture: Place event-traced strings into trace buffer "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200
  [PATCH tip/core/rcu 02/13] rcutorture: Print SRCU lock/unlock totals "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-25 00:30 +0200

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