rcutorture: Check for unwatched readers

RCU is supposed to be watching all non-idle kernel code and also all
softirq handlers.  This commit adds some teeth to this statement by
adding a WARN_ON_ONCE().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 37455a1..9c31001 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1377,6 +1377,7 @@ static bool rcu_torture_one_read(struct torture_random_state *trsp)
        struct rt_read_seg *rtrsp1;
        unsigned long long ts;
 
+       WARN_ON_ONCE(!rcu_is_watching());
        newstate = rcutorture_extend_mask(readstate, trsp);
        rcutorture_one_extend(&readstate, newstate, trsp, rtrsp++);
        started = cur_ops->get_gp_seq();