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Commit f34c8585 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 96036c43

kernel/rcu/rcutorture.c

+13 −0
Original line number Diff line number Diff line
@@ -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);

	}

}



/*