rcutorture: Enable SRCU readers from timer handler

Now that it is legal to invoke srcu_read_lock() and srcu_read_unlock()
for a given srcu_struct from both process context and {soft,}irq
handlers, it is time to test it.  This commit therefore enables
testing of SRCU readers from rcutorture's timer handler, using in_task()
to determine whether or not it is safe to sleep in the SRCU read-side
critical sections.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index aedc8f2ad9559f33aaf4bbaae6181da845a6c041..8d59c82bec0b4704b749918a34d1662717c22e2a 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -522,7 +522,7 @@ static void srcu_read_delay(struct torture_random_state *rrsp)
 
        delay = torture_random(rrsp) %
                (nrealreaders * 2 * longdelay * uspertick);
-       if (!delay)
+       if (!delay && in_task())
                schedule_timeout_interruptible(longdelay);
        else
                rcu_read_delay(rrsp);
@@ -583,6 +583,7 @@ static struct rcu_torture_ops srcu_ops = {
        .call           = srcu_torture_call,
        .cb_barrier     = srcu_torture_barrier,
        .stats          = srcu_torture_stats,
+       .irq_capable    = 1,
        .name           = "srcu"
 };
 
@@ -615,6 +616,7 @@ static struct rcu_torture_ops srcud_ops = {
        .call           = srcu_torture_call,
        .cb_barrier     = srcu_torture_barrier,
        .stats          = srcu_torture_stats,
+       .irq_capable    = 1,
        .name           = "srcud"
 };