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Date: Wed, 17 Sep 2014 23:21:47 -0400
From: Pranith Kumar <bobby.prani@...il.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Josh Triplett <josh@...htriplett.org>,
Steven Rostedt <rostedt@...dmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
linux-kernel@...r.kernel.org (open list:READ-COPY UPDATE...)
Subject: [RFC PATCH 1/3] rcu: Add early boot self tests
Add early boot self tests for RCU under CONFIG_PROVE_RCU.
Currently the only test is adding a dummy callback which increments a counter
which we then later verify after calling rcu_barrier*().
Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
kernel/rcu/rcu.h | 2 ++
kernel/rcu/tiny.c | 4 ++-
kernel/rcu/tree.c | 2 ++
kernel/rcu/update.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 98 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index ff1a6de..07bb02e 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -135,4 +135,6 @@ int rcu_jiffies_till_stall_check(void);
*/
#define TPS(x) tracepoint_string(x)
+void rcu_early_boot_tests(void);
+
#endif /* __LINUX_RCU_H */
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index c0623fc..d3d44c5 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -380,7 +380,9 @@ void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
}
EXPORT_SYMBOL_GPL(call_rcu_bh);
-void rcu_init(void)
+void __init rcu_init(void)
{
open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
+
+ rcu_early_boot_tests();
}
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e4c6d60..f93a62c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3766,6 +3766,8 @@ void __init rcu_init(void)
pm_notifier(rcu_pm_notify, 0);
for_each_online_cpu(cpu)
rcu_cpu_notify(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
+
+ rcu_early_boot_tests();
}
#include "tree_plugin.h"
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 3ef8ba5..5929f0c 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -690,3 +690,94 @@ static void rcu_spawn_tasks_kthread(void)
}
#endif /* #ifdef CONFIG_TASKS_RCU */
+
+#ifdef CONFIG_PROVE_RCU
+
+/*
+ * Early boot self test parameters, one for each flavor
+ */
+static bool rcu_self_test;
+static bool rcu_self_test_bh;
+static bool rcu_self_test_sched;
+static bool rcu_self_test_srcu;
+
+module_param(rcu_self_test, bool, 0444);
+module_param(rcu_self_test_bh, bool, 0444);
+module_param(rcu_self_test_sched, bool, 0444);
+module_param(rcu_self_test_srcu, bool, 0444);
+
+static int rcu_self_test_counter;
+static struct rcu_head head;
+DEFINE_STATIC_SRCU(srcu_struct);
+
+static void test_callback(struct rcu_head *r)
+{
+ rcu_self_test_counter++;
+ pr_info("RCU test callback executed %d\n", rcu_self_test_counter);
+}
+
+static void early_boot_test_call_rcu(void)
+{
+ call_rcu(&head, test_callback);
+}
+
+static void early_boot_test_call_rcu_bh(void)
+{
+ call_rcu_bh(&head, test_callback);
+}
+
+static void early_boot_test_call_rcu_sched(void)
+{
+ call_rcu_sched(&head, test_callback);
+}
+
+static void early_boot_test_call_srcu(void)
+{
+ call_srcu(&srcu_struct, &head, test_callback);
+}
+
+void rcu_early_boot_tests(void)
+{
+ pr_info("Running RCU self tests\n");
+
+ if (rcu_self_test)
+ early_boot_test_call_rcu();
+ if (rcu_self_test_bh)
+ early_boot_test_call_rcu_bh();
+ if (rcu_self_test_sched)
+ early_boot_test_call_rcu_sched();
+ if (rcu_self_test_srcu)
+ early_boot_test_call_srcu();
+}
+
+static int rcu_verify_early_boot_tests(void)
+{
+ int ret = 0;
+ int early_boot_test_counter = 0;
+
+ if (rcu_self_test) {
+ early_boot_test_counter++;
+ rcu_barrier();
+ }
+ if (rcu_self_test_bh) {
+ early_boot_test_counter++;
+ rcu_barrier_bh();
+ }
+ if (rcu_self_test_sched) {
+ early_boot_test_counter++;
+ rcu_barrier_sched();
+ }
+ if (rcu_self_test_srcu) {
+ early_boot_test_counter++;
+ srcu_barrier(&srcu_struct);
+ }
+
+ if (rcu_self_test_counter != early_boot_test_counter)
+ ret = -1;
+
+ return ret;
+}
+late_initcall(rcu_verify_early_boot_tests);
+#else
+void rcu_early_boot_tests(void) {}
+#endif /* CONFIG_PROVE_RCU */
--
2.1.0
--
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