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=-15.8 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,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 CE33FC2BB3F for ; Fri, 4 Dec 2020 17:10:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B33A822CA0 for ; Fri, 4 Dec 2020 17:10:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388532AbgLDRKi (ORCPT ); Fri, 4 Dec 2020 12:10:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34192 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731192AbgLDRKg (ORCPT ); Fri, 4 Dec 2020 12:10:36 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA3DEC061A54 for ; Fri, 4 Dec 2020 09:09:56 -0800 (PST) Message-Id: <20201204170805.338268919@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1607101795; 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=TFX54TvGMffw/o6aEgrLgJJn5GPJ5JlAAN3zCOb5gkI=; b=HsSGcBo460yo8QLH5CAwtgokj1BB+HP4qjRZGSbtkVPg5PhrHnFVoSrkYB7pwpm/mW3Nz5 mK0U6FmswsvAbXhHfPgOewak+qxcSMszCkAMdYRmfX0r4x6jIZ9L1CTtuPziawuNeQFmKZ zjOsRMG+IKDOBlNuZRFnqZcrjLVD0NSqD6z0cyK/on2/uZsBPLEhlMKpWQ85lAGqLH9S9y T/4M/vaUDngt1uPRUTrStwP402hGR7bH5vzWvcPCAFOOiK3Mh0rUS08O5Q0/CmtseiJ7xB 5r3z9svzR+K/BN4+/eOhrm1V+d7aepuyXLQg0VpQNMoqrxQbAGznJjwQIelTig== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1607101795; 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=TFX54TvGMffw/o6aEgrLgJJn5GPJ5JlAAN3zCOb5gkI=; b=x7HEbA/zFI3LrnItfShrgVVc+paHq90pyramZ4jF5HCd3RIij3NSB1L/oGWz+Ne8FSkFkp EFYYGQAYOn7oLAAw== Date: Fri, 04 Dec 2020 18:01:57 +0100 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Frederic Weisbecker , Paul McKenney , Sebastian Andrzej Siewior Subject: [patch V2 6/9] rcu: Prevent false positive softirq warning on RT References: <20201204170151.960336698@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner 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"); \