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Subject[PATCH rcu 03/25] rcutorture: Abstract synchronous and polled API testing
Date
This commit abstracts a do_rtws_sync() function that does synchronous
grace-period testing, but also testing the polled API 25% of the time
each for the normal and full-state variants of the polled API.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/rcutorture.c | 48 ++++++++++++++++++++++++++++++-----------
1 file changed, 36 insertions(+), 12 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 4f196ebce7f29..c3c94e343eb28 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1207,6 +1207,40 @@ static void rcu_torture_write_types(void)
}
}

+/*
+ * Do the specified rcu_torture_writer() synchronous grace period,
+ * while also testing out the polled APIs. Note well that the single-CPU
+ * grace-period optimizations must be accounted for.
+ */
+static void do_rtws_sync(struct torture_random_state *trsp, void (*sync)(void))
+{
+ unsigned long cookie;
+ struct rcu_gp_oldstate cookie_full;
+ bool dopoll;
+ bool dopoll_full;
+ unsigned long r = torture_random(trsp);
+
+ dopoll = cur_ops->get_gp_state && cur_ops->poll_gp_state && !(r & 0x300);
+ dopoll_full = cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full && !(r & 0xc00);
+ if (dopoll || dopoll_full)
+ cpus_read_lock();
+ if (dopoll)
+ cookie = cur_ops->get_gp_state();
+ if (dopoll_full)
+ cur_ops->get_gp_state_full(&cookie_full);
+ if (dopoll || (!IS_ENABLED(CONFIG_TINY_RCU) && dopoll_full && num_online_cpus() <= 1))
+ sync();
+ sync();
+ WARN_ONCE(dopoll && !cur_ops->poll_gp_state(cookie),
+ "%s: Cookie check 3 failed %pS() online %*pbl.",
+ __func__, sync, cpumask_pr_args(cpu_online_mask));
+ WARN_ONCE(dopoll_full && !cur_ops->poll_gp_state_full(&cookie_full),
+ "%s: Cookie check 4 failed %pS() online %*pbl",
+ __func__, sync, cpumask_pr_args(cpu_online_mask));
+ if (dopoll || dopoll_full)
+ cpus_read_unlock();
+}
+
/*
* RCU torture writer kthread. Repeatedly substitutes a new structure
* for that pointed to by rcu_torture_current, freeing the old structure
@@ -1295,12 +1329,7 @@ rcu_torture_writer(void *arg)
break;
case RTWS_EXP_SYNC:
rcu_torture_writer_state = RTWS_EXP_SYNC;
- if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
- cur_ops->get_gp_state_full(&cookie_full);
- cur_ops->exp_sync();
- cur_ops->exp_sync();
- if (cur_ops->get_gp_state_full && cur_ops->poll_gp_state_full)
- WARN_ON_ONCE(!cur_ops->poll_gp_state_full(&cookie_full));
+ do_rtws_sync(&rand, cur_ops->exp_sync);
rcu_torture_pipe_update(old_rp);
break;
case RTWS_COND_GET:
@@ -1339,12 +1368,7 @@ rcu_torture_writer(void *arg)
break;
case RTWS_SYNC:
rcu_torture_writer_state = RTWS_SYNC;
- if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
- cookie = cur_ops->get_gp_state();
- cur_ops->sync();
- cur_ops->sync();
- if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
- WARN_ON_ONCE(!cur_ops->poll_gp_state(cookie));
+ do_rtws_sync(&rand, cur_ops->sync);
rcu_torture_pipe_update(old_rp);
break;
default:
--
2.31.1.189.g2e36527f23
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