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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A91F4C43217 for ; Sun, 9 Oct 2022 20:56:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230457AbiJIU4Z (ORCPT ); Sun, 9 Oct 2022 16:56:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230453AbiJIUzt (ORCPT ); Sun, 9 Oct 2022 16:55:49 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE33731ECD; Sun, 9 Oct 2022 13:53:19 -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 ams.source.kernel.org (Postfix) with ESMTPS id 6CDC8B80DC5; Sun, 9 Oct 2022 20:53:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24919C433C1; Sun, 9 Oct 2022 20:53:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665348797; bh=NnNOle+6GdU/dCal8eZzhfxhUebGvSc2Ta5UO/0MGsw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OwhSRwlnPUiGW7PkWAFW3iuQaDVUtCxAMw6QlZpIlaF39c7kabY0tgCVXyYKb/IRg mRJ1ijpBNSVf6H9m64HA+siG6tmLmcbJOnWDu16TMuDwmB2+Jvd1OzmijieZ6YFTfY 3TP+MN2G7NYaTWB9MJJlQKBkypZtQGXhc2aLksWgBY18T4HSFEbhc7Eyo4iEqOIb3d PTvCQ2G+5E9VIqn4g6k7ty6phMcm4h63ULCnaAnSoGRzVIzggmWoDVWcfReRUTrsPe e0tpvCr4ebPklGUgcWB7OE1ixJHA8W+KWZbGeGh4/3ksECRZGuDwDQPoob2sdBlw01 wWIUpc5Y+oNUw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zqiang , "Paul E . McKenney" , Sasha Levin , frederic@kernel.org, quic_neeraju@quicinc.com, josh@joshtriplett.org, rcu@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 04/15] rcu-tasks: Convert RCU_LOCKDEP_WARN() to WARN_ONCE() Date: Sun, 9 Oct 2022 16:52:57 -0400 Message-Id: <20221009205308.1202627-4-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221009205308.1202627-1-sashal@kernel.org> References: <20221009205308.1202627-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Zqiang [ Upstream commit fcd53c8a4dfa38bafb89efdd0b0f718f3a03f884 ] Kernels built with CONFIG_PROVE_RCU=y and CONFIG_DEBUG_LOCK_ALLOC=y attempt to emit a warning when the synchronize_rcu_tasks_generic() function is called during early boot while the rcu_scheduler_active variable is RCU_SCHEDULER_INACTIVE. However the warnings is not actually be printed because the debug_lockdep_rcu_enabled() returns false, exactly because the rcu_scheduler_active variable is still equal to RCU_SCHEDULER_INACTIVE. This commit therefore replaces RCU_LOCKDEP_WARN() with WARN_ONCE() to force these warnings to actually be printed. Signed-off-by: Zqiang Signed-off-by: Paul E. McKenney Signed-off-by: Sasha Levin --- kernel/rcu/tasks.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 60c9eacac25b..ae8396032b5d 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -171,7 +171,7 @@ static void call_rcu_tasks_generic(struct rcu_head *rhp, rcu_callback_t func, static void synchronize_rcu_tasks_generic(struct rcu_tasks *rtp) { /* Complain if the scheduler has not started. */ - RCU_LOCKDEP_WARN(rcu_scheduler_active == RCU_SCHEDULER_INACTIVE, + WARN_ONCE(rcu_scheduler_active == RCU_SCHEDULER_INACTIVE, "synchronize_rcu_tasks called too soon"); /* Wait for the grace period. */ -- 2.35.1