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[94.245.46.61]) by smtp.gmail.com with ESMTPSA id z26sm17323lja.125.2020.12.09.12.28.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Dec 2020 12:28:20 -0800 (PST) From: "Uladzislau Rezki (Sony)" To: LKML , RCU , "Paul E . McKenney" , Michael Ellerman Cc: Andrew Morton , Daniel Axtens , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Peter Zijlstra , Michal Hocko , Thomas Gleixner , "Theodore Y . Ts'o" , Sebastian Andrzej Siewior , Uladzislau Rezki , Oleksiy Avramchenko Subject: [PATCH 2/2] rcu-tasks: add RCU-tasks self tests Date: Wed, 9 Dec 2020 21:27:32 +0100 Message-Id: <20201209202732.5896-2-urezki@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201209202732.5896-1-urezki@gmail.com> References: <20201209202732.5896-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add self tests for checking of RCU-tasks API functionality. It covers: - wait API functions; - invoking/completion call_rcu_tasks*(). Self-tests are run when CONFIG_PROVE_RCU kernel parameter is set. Signed-off-by: Uladzislau Rezki (Sony) --- kernel/rcu/tasks.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 67a162949763..9407772780c1 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1225,6 +1225,16 @@ void show_rcu_tasks_gp_kthreads(void) } #endif /* #ifndef CONFIG_TINY_RCU */ +static struct rcu_head rhp; +static int rcu_execurted_test_counter; +static int rcu_run_test_counter; + +static void test_rcu_tasks_callback(struct rcu_head *r) +{ + pr_info("RCU-tasks test callback executed %d\n", + ++rcu_execurted_test_counter); +} + void __init rcu_init_tasks_generic(void) { #ifdef CONFIG_TASKS_RCU @@ -1238,7 +1248,41 @@ void __init rcu_init_tasks_generic(void) #ifdef CONFIG_TASKS_TRACE_RCU rcu_spawn_tasks_trace_kthread(); #endif + + if (IS_ENABLED(CONFIG_PROVE_RCU)) { + pr_info("Running RCU-tasks wait API self tests\n"); +#ifdef CONFIG_TASKS_RCU + rcu_run_test_counter++; + call_rcu_tasks(&rhp, test_rcu_tasks_callback); + synchronize_rcu_tasks(); +#endif + +#ifdef CONFIG_TASKS_RUDE_RCU + rcu_run_test_counter++; + call_rcu_tasks_trace(&rhp, test_rcu_tasks_callback); + synchronize_rcu_tasks_rude(); +#endif + +#ifdef CONFIG_TASKS_TRACE_RCU + rcu_run_test_counter++; + call_rcu_tasks_trace(&rhp, test_rcu_tasks_callback); + synchronize_rcu_tasks_trace(); +#endif + } +} + +static int rcu_tasks_verify_self_tests(void) +{ + int ret = 0; + + if (rcu_run_test_counter != rcu_execurted_test_counter) { + WARN_ON(1); + ret = -1; + } + + return ret; } +late_initcall(rcu_tasks_verify_self_tests); #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */ static inline void rcu_tasks_bootup_oddness(void) {} -- 2.20.1