From patchwork Fri Jun 9 12:05:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 13273781 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DEAD6C7EE2E for ; Fri, 9 Jun 2023 12:05:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239929AbjFIMFe (ORCPT ); Fri, 9 Jun 2023 08:05:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52404 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239376AbjFIMFc (ORCPT ); Fri, 9 Jun 2023 08:05:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65E212129; Fri, 9 Jun 2023 05:05:31 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C24F765780; Fri, 9 Jun 2023 12:05:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CAF2C4339B; Fri, 9 Jun 2023 12:05:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686312330; bh=Mulyl6e7rJ5peE1a5uzhgduBw1OBr/XzNRcGnx3foV0=; h=From:To:Cc:Subject:Date:From; b=rl2CDehTUEs0xIEUKQ8eoHoGIVQcpJqakRt2Xp1wyiJgxVlglzXcw1vg7CDg0D9oB YE1qAFd3+uCnM9VTJMM18+APiuVCPxfiaY+BaCP8QAbuXGmEDj1MHiKd76AE21FO5L 6B2PrSZ4zVReUEI6ZpkgEZ3STpvyxe6kAq06AoGMIcj01XwQ6YmRfgnaKncQv4yTxY xj6M0E4YKInelfjWdyiM/MprConNe/jKvSoh6ViDXcLRPt1zAgTnUsAvS0SQY9ei4f XrNxAUKG2NdcojrP5vRxa7IuF2budoT4hjKmMoIzxvTqwk/lChLJBCkC+hWM1uUJ7U 94TwrYpH45aLA== From: Arnd Bergmann To: "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Davidlohr Bueso Cc: Arnd Bergmann , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Mukesh Ojha , Nicolas Saenz Julienne , Zhen Lei , Qiuxu Zhuo , rcu@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] rcuscale: fix building with RCU_TINY Date: Fri, 9 Jun 2023 14:05:14 +0200 Message-Id: <20230609120522.3921015-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Arnd Bergmann Both the CONFIG_TASKS_RCU and CONFIG_TASKS_RUDE_RCU options are broken when RCU_TINY is enabled as well, as some functions are missing a declaration. In file included from kernel/rcu/update.c:649: kernel/rcu/tasks.h:1271:21: error: no previous prototype for 'get_rcu_tasks_rude_gp_kthread' [-Werror=missing-prototypes] 1271 | struct task_struct *get_rcu_tasks_rude_gp_kthread(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/rcu/rcuscale.c:330:27: error: 'get_rcu_tasks_rude_gp_kthread' undeclared here (not in a function); did you mean 'get_rcu_tasks_trace_gp_kthread'? 330 | .rso_gp_kthread = get_rcu_tasks_rude_gp_kthread, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | get_rcu_tasks_trace_gp_kthread In file included from /home/arnd/arm-soc/kernel/rcu/update.c:649: kernel/rcu/tasks.h:1113:21: error: no previous prototype for 'get_rcu_tasks_gp_kthread' [-Werror=missing-prototypes] 1113 | struct task_struct *get_rcu_tasks_gp_kthread(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ Also, building with CONFIG_TASKS_RUDE_RCU but not CONFIG_TASKS_RCU is broken because of some missing stub functions: kernel/rcu/rcuscale.c:322:27: error: 'tasks_scale_read_lock' undeclared here (not in a function); did you mean 'srcu_scale_read_lock'? 322 | .readlock = tasks_scale_read_lock, | ^~~~~~~~~~~~~~~~~~~~~ | srcu_scale_read_lock kernel/rcu/rcuscale.c:323:27: error: 'tasks_scale_read_unlock' undeclared here (not in a function); did you mean 'srcu_scale_read_unlock'? 323 | .readunlock = tasks_scale_read_unlock, | ^~~~~~~~~~~~~~~~~~~~~~~ | srcu_scale_read_unlock Move the declarations outside of the RCU_TINY #ifdef and duplicate the shared stub functions to address all of the above. Fixes: 88d7ff818f0ce ("rcuscale: Add RCU Tasks Rude testing") Fixes: 755f1c5eb416b ("rcuscale: Measure RCU Tasks Trace grace-period kthread CPU time") Signed-off-by: Arnd Bergmann --- kernel/rcu/rcu.h | 14 ++++++++------ kernel/rcu/rcuscale.c | 13 +++++++++++-- 2 files changed, 19 insertions(+), 8 deletions(-) diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 9829d8161b213..5befd8780dcd3 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -505,18 +505,20 @@ void rcu_async_relax(void); void rcupdate_announce_bootup_oddness(void); #ifdef CONFIG_TASKS_RCU_GENERIC void show_rcu_tasks_gp_kthreads(void); -# ifdef CONFIG_TASKS_RCU -struct task_struct *get_rcu_tasks_gp_kthread(void); -# endif // # ifdef CONFIG_TASKS_RCU -# ifdef CONFIG_TASKS_RUDE_RCU -struct task_struct *get_rcu_tasks_rude_gp_kthread(void); -# endif // # ifdef CONFIG_TASKS_RUDE_RCU #else /* #ifdef CONFIG_TASKS_RCU_GENERIC */ static inline void show_rcu_tasks_gp_kthreads(void) {} #endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */ void rcu_request_urgent_qs_task(struct task_struct *t); #endif /* #else #ifdef CONFIG_TINY_RCU */ +#ifdef CONFIG_TASKS_RCU +struct task_struct *get_rcu_tasks_gp_kthread(void); +#endif // # ifdef CONFIG_TASKS_RCU + +#ifdef CONFIG_TASKS_RUDE_RCU +struct task_struct *get_rcu_tasks_rude_gp_kthread(void); +#endif // # ifdef CONFIG_TASKS_RUDE_RCU + #define RCU_SCHEDULER_INACTIVE 0 #define RCU_SCHEDULER_INIT 1 #define RCU_SCHEDULER_RUNNING 2 diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c index 5ce3b4e7ce711..a0eae19007088 100644 --- a/kernel/rcu/rcuscale.c +++ b/kernel/rcu/rcuscale.c @@ -316,11 +316,20 @@ static struct rcu_scale_ops tasks_ops = { * Definitions for RCU-tasks-rude scalability testing. */ +static int tasks_rude_scale_read_lock(void) +{ + return 0; +} + +static void tasks_rude_scale_read_unlock(int idx) +{ +} + static struct rcu_scale_ops tasks_rude_ops = { .ptype = RCU_TASKS_RUDE_FLAVOR, .init = rcu_sync_scale_init, - .readlock = tasks_scale_read_lock, - .readunlock = tasks_scale_read_unlock, + .readlock = tasks_rude_scale_read_lock, + .readunlock = tasks_rude_scale_read_unlock, .get_gp_seq = rcu_no_completed, .gp_diff = rcu_seq_diff, .async = call_rcu_tasks_rude,