From patchwork Fri Nov 13 14:02:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11903679 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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 081A5C61DD8 for ; Fri, 13 Nov 2020 14:27:58 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5948A22226 for ; Fri, 13 Nov 2020 14:27:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="KKpppngC"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tyt0Qkxw"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="fnUwM9/d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5948A22226 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:Subject:To:From:Date: Message-Id:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:List-Owner; bh=UhyPnBQ+FWgDuV/4QiNxVES/fttCMmlalpBZVIY2Z/0=; b=KKpppngCK33X3JzOMlwMZR+W3 byEgdq7XDz6qAzHHlk8OicG3nV7JhAIR3eBnldexOWNnLe6mxTZxRA0ioNK3wL1uZgmCCPZGNBJpz Z2qB4M1s4sWx0nJIJ0gLK6O84BAVIAVN+nt+FTcMd13YcKehaujFlFThM4Al3SPCLBbtmJCCWf15l wWjY/tkFDE7iAUQZV5qeeo6PEhyS//0dI6bXRq0Y3vqwqe4+rkkjDU5rjLF6+o5Zl97MN0chxMKOE 8fAcTEUciT5WibCctP7lTsNN/mh/brCKYtd91jGBiY+DYxNM3GbfijhaNG9PiwSNeKlEQ7MLAVrRp U208xK7tw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kda2w-0007jH-4s; Fri, 13 Nov 2020 14:27:26 +0000 Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kda0B-0006Nq-FF; Fri, 13 Nov 2020 14:24:44 +0000 Message-Id: <20201113141734.558782917@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1605277474; h=from:from: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: references:references; bh=bJK1LO9o5t1YtWfdpnIDn/r1MfJlfGCVMVDvWJrraew=; b=tyt0QkxwI34Q9lW1JnnsRXtivNBFuy/gK+3Wg6p8oacuKn8YRx4hzKHdlinpDrp/pth55z /BAfQMJ9oWB1Hzij2dQW9TnNIt72zNuUSK2q7Y9sitLs8LbSezy690e41NnW6R8l+bjdLt Dy9N0KzC4rjbiZvWJbppzIRBBCJaXY4iwlr6/VDI4DFLjpd+Wid0zoJ5Q8KMUVs9kyP8bn TkcwawJ0a/VM2kifuvxHRxw/fuqLeI5ylL/tFMj9ii+lhwD4TeYdWFVfkRiSMmUrOKnq5i Dd6AOCs0W4DGmkrLSJyCQlgdlvArt+4ylbScr0BlX4BWaQMR0kH/Ya66obWHBg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1605277474; h=from:from: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: references:references; bh=bJK1LO9o5t1YtWfdpnIDn/r1MfJlfGCVMVDvWJrraew=; b=fnUwM9/d5ZyoIg34+qJ50+11yImCVU3JOFQ12wxkKiRXsscC5nDPI2NL/xdAbOB6hy8cm9 lNk1ofd0+ZGBajBA== Date: Fri, 13 Nov 2020 15:02:23 +0100 From: Thomas Gleixner To: LKML Subject: [patch 16/19] rcu: Prevent false positive softirq warning on RT References: <20201113140207.499353218@linutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201113_092435_739609_9BD0299F X-CRM114-Status: GOOD ( 10.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marc Zyngier , Rich Felker , Catalin Marinas , Paul McKenney , Arnd Bergmann , linux-sh@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Frederic Weisbecker , Valentin Schneider , Jeff Dike , Russell King , Yoshinori Sato , "James E.J. Bottomley" , linux-parisc@vger.kernel.org, Helge Deller , linux-um@lists.infradead.org, Will Deacon , Sebastian Andrzej Siewior , linux-arm-kernel@lists.infradead.org, Anton Ivanov Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Soft interrupt disabled sections can legitimately be preempted or schedule out when blocking on a lock on RT enabled kernels so the RCU preempt check warning has to be disabled for RT kernels. Signed-off-by: Thomas Gleixner --- include/linux/rcupdate.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -319,7 +319,8 @@ static inline void rcu_preempt_sleep_che #define rcu_sleep_check() \ do { \ rcu_preempt_sleep_check(); \ - RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \ + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) \ + RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map), \ "Illegal context switch in RCU-bh read-side critical section"); \ RCU_LOCKDEP_WARN(lock_is_held(&rcu_sched_lock_map), \ "Illegal context switch in RCU-sched read-side critical section"); \