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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 42EFEC433FE for ; Fri, 4 Dec 2020 18:00:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD49022B43 for ; Fri, 4 Dec 2020 18:00:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728989AbgLDSAF (ORCPT ); Fri, 4 Dec 2020 13:00:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:42180 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726441AbgLDSAE (ORCPT ); Fri, 4 Dec 2020 13:00:04 -0500 Date: Fri, 4 Dec 2020 09:59:24 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1607104764; bh=stx28BLkuSKf75/8Q2amOwQXxovpFdEOUeWIz6NzVY4=; h=From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=Yzh44eBjSDs+/li8CL5E64EJc2uekRuqwExYejoDtHuXtqYK7lqo3nTz9iyUgwBu0 dq894nqGHv8bjL6WWD+FBJ+mzlJyT3mTD8H8SILcWMiJPEEtuOuEebJoVn8+yZDFqy ahCOtlop9tMDcEtY572jXr5GdC88lxaB2U13ptLCMnfsWyiRgucC6/x2WzgiZlzDkE M2DXjDcCPoGn9m2MAoGZMdTciC+yppseTgqZsvlPFhZQphKmDx3YYA2cZXFoi7sFHS GIIWOogojbAsIimPJl7wEZbavnH+KQx3NmkTOrgyyfvITLMs7YOYb8S1iqe+iWuQMF lGVo5U/3kWRvA== From: "Paul E. McKenney" To: Thomas Gleixner Cc: LKML , Peter Zijlstra , Frederic Weisbecker , Sebastian Andrzej Siewior Subject: Re: [patch V2 6/9] rcu: Prevent false positive softirq warning on RT Message-ID: <20201204175923.GZ1437@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20201204170151.960336698@linutronix.de> <20201204170805.338268919@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201204170805.338268919@linutronix.de> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 04, 2020 at 06:01:57PM +0100, Thomas Gleixner wrote: > 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 Reviewed-by: Paul E. McKenney > --- > 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"); \ >