From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B274C433DB for ; Fri, 12 Feb 2021 13:02:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7333664E3D for ; Fri, 12 Feb 2021 13:02:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232066AbhBLNCi (ORCPT ); Fri, 12 Feb 2021 08:02:38 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:45414 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231724AbhBLMkm (ORCPT ); Fri, 12 Feb 2021 07:40:42 -0500 Date: Fri, 12 Feb 2021 12:37:23 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1613133444; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=2pa/tvKC8kX87YpN0GJLxqnBZJ43AuDqAJGMs4EEDnw=; b=DjL6Ar24YHs+cF/EjXnK/eAgKifjNpt36QjvPcG741Nxg1VC0EQnJWEUr5fL2hDiIMc1Bh DZSKGku1SKhKGe4XPHkNwKYCvwyc5t0wC19pHcHDz24fiTjK5igRlL/998tRkuq7Xi3U6d 0pE8mOS1gl3/vQDsj9GW5pwi66AWhs3q39QlAKn1RKhylUd9v67e0hg31tk+vwY5owIMsP DQsCwCr7DwnIqQeoZag5VNWBv5SoWsuPACbgS64irmGTZ6NVCdrl7hjlNeL1N8e7K+dWrQ 0eBbsUHIWBAaUBAZMKsegbSuMkIPsvf5qYHrV5CAwi/NGXnOOclyyJueY9U81Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1613133444; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=2pa/tvKC8kX87YpN0GJLxqnBZJ43AuDqAJGMs4EEDnw=; b=G3PGzo+wovI+FwUFMVAG9Tjhfhzh1UASizoEUaYz1dsepGgGWYYGIM8aKd355nCOvsz32P aTZLUSp653fyu/Aw== From: "tip-bot2 for Uladzislau Rezki (Sony)" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: core/rcu] rcu-tasks: Add RCU-tasks self tests Cc: "Uladzislau Rezki (Sony)" , "Paul E. McKenney" , x86@kernel.org, linux-kernel@vger.kernel.org MIME-Version: 1.0 Message-ID: <161313344357.23325.6360256353255340492.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the core/rcu branch of tip: Commit-ID: bfba7ed084f8ab0269a5a1d2f51b07865456c334 Gitweb: https://git.kernel.org/tip/bfba7ed084f8ab0269a5a1d2f51b07865456c334 Author: Uladzislau Rezki (Sony) AuthorDate: Wed, 09 Dec 2020 21:27:32 +01:00 Committer: Paul E. McKenney CommitterDate: Mon, 04 Jan 2021 15:54:49 -08:00 rcu-tasks: Add RCU-tasks self tests This commit adds self tests for early-boot use of RCU-tasks grace periods. It tests all three variants (Rude, Tasks, and Tasks Trace) and covers both synchronous (e.g., synchronize_rcu_tasks()) and asynchronous (e.g., call_rcu_tasks()) grace-period APIs. Self-tests are run only in kernels built with CONFIG_PROVE_RCU=y. Signed-off-by: Uladzislau Rezki (Sony) [ paulmck: Handle CONFIG_PROVE_RCU=n and identify test cases' callbacks. ] Signed-off-by: Paul E. McKenney --- kernel/rcu/tasks.h | 79 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 79 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 73bbe79..74767d3 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1231,6 +1231,82 @@ void show_rcu_tasks_gp_kthreads(void) } #endif /* #ifndef CONFIG_TINY_RCU */ +#ifdef CONFIG_PROVE_RCU +struct rcu_tasks_test_desc { + struct rcu_head rh; + const char *name; + bool notrun; +}; + +static struct rcu_tasks_test_desc tests[] = { + { + .name = "call_rcu_tasks()", + /* If not defined, the test is skipped. */ + .notrun = !IS_ENABLED(CONFIG_TASKS_RCU), + }, + { + .name = "call_rcu_tasks_rude()", + /* If not defined, the test is skipped. */ + .notrun = !IS_ENABLED(CONFIG_TASKS_RUDE_RCU), + }, + { + .name = "call_rcu_tasks_trace()", + /* If not defined, the test is skipped. */ + .notrun = !IS_ENABLED(CONFIG_TASKS_TRACE_RCU) + } +}; + +static void test_rcu_tasks_callback(struct rcu_head *rhp) +{ + struct rcu_tasks_test_desc *rttd = + container_of(rhp, struct rcu_tasks_test_desc, rh); + + pr_info("Callback from %s invoked.\n", rttd->name); + + rttd->notrun = true; +} + +static void rcu_tasks_initiate_self_tests(void) +{ + pr_info("Running RCU-tasks wait API self tests\n"); +#ifdef CONFIG_TASKS_RCU + synchronize_rcu_tasks(); + call_rcu_tasks(&tests[0].rh, test_rcu_tasks_callback); +#endif + +#ifdef CONFIG_TASKS_RUDE_RCU + synchronize_rcu_tasks_rude(); + call_rcu_tasks_rude(&tests[1].rh, test_rcu_tasks_callback); +#endif + +#ifdef CONFIG_TASKS_TRACE_RCU + synchronize_rcu_tasks_trace(); + call_rcu_tasks_trace(&tests[2].rh, test_rcu_tasks_callback); +#endif +} + +static int rcu_tasks_verify_self_tests(void) +{ + int ret = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(tests); i++) { + if (!tests[i].notrun) { // still hanging. + pr_err("%s has been failed.\n", tests[i].name); + ret = -1; + } + } + + if (ret) + WARN_ON(1); + + return ret; +} +late_initcall(rcu_tasks_verify_self_tests); +#else /* #ifdef CONFIG_PROVE_RCU */ +static void rcu_tasks_initiate_self_tests(void) { } +#endif /* #else #ifdef CONFIG_PROVE_RCU */ + void __init rcu_init_tasks_generic(void) { #ifdef CONFIG_TASKS_RCU @@ -1244,6 +1320,9 @@ void __init rcu_init_tasks_generic(void) #ifdef CONFIG_TASKS_TRACE_RCU rcu_spawn_tasks_trace_kthread(); #endif + + // Run the self-tests. + rcu_tasks_initiate_self_tests(); } #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */