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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@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-07-20 15:27:32 -07:00
parent 96036c4306
commit f34c8585ed
1 changed files with 13 additions and 0 deletions
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13
kernel/rcu/rcutorture.c
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@ -1080,6 +1080,11 @@ rcu_torture_fakewriter(void *arg)
return 0; return 0;
} }
static void rcu_torture_timer_cb(struct rcu_head *rhp)
{
kfree(rhp);
}
/* /*
* RCU torture reader from timer handler. Dereferences rcu_torture_current, * RCU torture reader from timer handler. Dereferences rcu_torture_current,
* incrementing the corresponding element of the pipeline array. The * 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]); __this_cpu_inc(rcu_torture_batch[completed]);
preempt_enable(); preempt_enable();
cur_ops->readunlock(idx); 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);
}
} }
/* /*