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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D8C9C433F5 for ; Thu, 7 Oct 2021 19:12:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00C7360F23 for ; Thu, 7 Oct 2021 19:12:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243885AbhJGTOW (ORCPT ); Thu, 7 Oct 2021 15:14:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:45612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233869AbhJGTOV (ORCPT ); Thu, 7 Oct 2021 15:14:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 74C066103B; Thu, 7 Oct 2021 19:12:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1633633947; bh=pLn061djoRVzHpAKyRTFX/vkEhTok2R4aa1KwWy8B3g=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=ok3fbvQdtkocugVAcgvNahdNC/KlhcNi46ZcODAoQzM413B4PrdWyZ7epBOp0RrYb AQdnwYV2YOZAKz4p3pfOeV4fQwpcq2cTKqklzDYCYpfGk0iq43R0Q1XoqZgzJC1mO3 SMAYAIwsroP3j/a5mDId3q5HV/RBX7PGDoZcj8J3BeZdv5JjNMc/O1wDvjS8/RRH+B E8VldLzOQPKPkf4PGXx6aUFX37VFR2V8OdG+MK1RcrEROk4h/dtGTFIVIiiVTl8+Ec Rd8sb8AH2adGH0/YLJycfTPr3AZ13CoIyv9SbtudeK+3eqkeZZdbCLYzHYQNTk91kp k/U4XzH5tavkg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 490FE5C0870; Thu, 7 Oct 2021 12:12:27 -0700 (PDT) Date: Thu, 7 Oct 2021 12:12:27 -0700 From: "Paul E. McKenney" To: Sebastian Andrzej Siewior Cc: Frederic Weisbecker , LKML , Peter Zijlstra , Uladzislau Rezki , Valentin Schneider , Thomas Gleixner , Boqun Feng , Neeraj Upadhyay , Josh Triplett , Joel Fernandes , rcu@vger.kernel.org Subject: Re: [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT_RT with NOCB + a few other fixes Message-ID: <20211007191227.GM880162@paulmck-ThinkPad-P17-Gen-1> Reply-To: paulmck@kernel.org References: <20210929221012.228270-1-frederic@kernel.org> <20211006151339.GA422833@paulmck-ThinkPad-P17-Gen-1> <20211007084920.4wo5fmjxmistivqa@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211007084920.4wo5fmjxmistivqa@linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 07, 2021 at 10:49:20AM +0200, Sebastian Andrzej Siewior wrote: > On 2021-10-06 08:13:39 [-0700], Paul E. McKenney wrote: > > On Thu, Sep 30, 2021 at 12:10:01AM +0200, Frederic Weisbecker wrote: > > > PREEMPT_RT has made rcu_core() preemptible, making it unsafe against > > > concurrent NOCB (de-)offloading. > > > > > > Thomas suggested to drop the local_lock() based solution and simply > > > check the offloaded state while context looks safe but that's not > > > enough. Here is a bit of rework. > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git > > > rcu/rt > > > > > > HEAD: aac1c58961446c731f2e989bd822ca1fd2659bad > > > > Many of these look quite good, but any chance of getting an official > > Tested-by from someone in the -rt community? > > I looked over the series, bootet the series and run a quick rcutorture > and didn't notice anything. > > Tested-by: Sebastian Andrzej Siewior Thank you, Sebastian!!! Thanx, Paul