Received: by 2002:a05:6a10:9e8c:0:0:0:0 with SMTP id y12csp1422657pxx; Fri, 30 Oct 2020 09:35:38 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwEsb9ButOHJgZoWbxR5/S3z50l9pO65T1q4Y4nznUjnMLTZ+pys6BnScATkliz/BQXi1x3 X-Received: by 2002:a17:906:6156:: with SMTP id p22mr3189564ejl.64.1604075737903; Fri, 30 Oct 2020 09:35:37 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1604075737; cv=none; d=google.com; s=arc-20160816; b=xuR8/ojQOxpOQ16vBlfjnIN9Gs4qD+d2IJKDruAMV4JumLPu2waUoA7O5pumy0grYg EYCMfXpoIfUDMHELJp0Zd2UnBq5penh/1YZSyOjTsdjBoPY+nB5RhLgo28W6zh2bEGac SpXlxbJd4DljSHm/G2ms5qtLnJQDhfYiO+VP4hmbxQKv1tZTVzR6gHxK68YrtqfIJ9zH 14/kIQMJX/s7NM+R7UkLvheMUUTmxGj2UtuBuKRgdkdCIX0lJtDF61tZ9tlM/p0hnKSX M0iZCLDzC+wfv70QF/6lwwCVg+e4tBccJwWK6T13BbyiYmopABypHN/en0dHtUaGtdQS Na3w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=nzvb2iJT3fY3BCk9MfslcxeX1mHUA/F5vmRcaVnmQ6A=; b=NXhiBdJlbtikHUSmvXgcAbQAUyH12zviztQySyv7j9suxVibwAGt7I961S3scdAQho 18XSqwkyBBw0PU6AzYhB/XLZMt1fhUJWgGvB9rN9yMQ/cKY3XV5KedB0aG0ncdL6tKa8 VmbMO3uvIrP63ZgR2bJrRcsm1QRVuZnCD+CKrKfoGe6QeauXeNk1LCV9AxRYab+u2Eom qbNmJ5OBw4PPY7n+htrjZJlN9TH13DoPKKaNZpOYglK1HARZjxMnc8sIbWVRYYFcj8Y5 UpFDKQ5hsZXPBJ61gLiQyIuxMkjWRSxvl2nLbFa6in6K7LrFofhGEz+p8Zx/eIQLB5l1 SXzQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=WPNolX+9; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id cb12si4666788edb.473.2020.10.30.09.35.15; Fri, 30 Oct 2020 09:35:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=WPNolX+9; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727079AbgJ3Qdc (ORCPT + 99 others); Fri, 30 Oct 2020 12:33:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:53910 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726272AbgJ3Qdb (ORCPT ); Fri, 30 Oct 2020 12:33:31 -0400 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 93B0520727; Fri, 30 Oct 2020 16:33:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604075611; bh=GHasvaoA/YIBwMT0l4avY/GTrYzzdWpoqx0j6MMRCrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WPNolX+9lnWZpaGeB9ku9gPkM/SvePUgM5vHPWrYdA7ULevn3HKYOhVRL8Laj3jIU s81pI0htDr+lmu89keR5vG7ezVBPtqWm8oPxssgtTVyM5yDghxB+qo5DYXeEY6eHLY vCeUI2n0mhhreD8JG3Co13bguFGtrQCe1IyrZN/I= From: Will Deacon To: "Paul E. McKenney" , Qian Cai Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] arm64/smp: Move rcu_cpu_starting() earlier Date: Fri, 30 Oct 2020 16:33:25 +0000 Message-Id: <160404559895.1777248.8248643695413627642.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201028182614.13655-1-cai@redhat.com> References: <20201028182614.13655-1-cai@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 28 Oct 2020 14:26:14 -0400, Qian Cai wrote: > The call to rcu_cpu_starting() in secondary_start_kernel() is not early > enough in the CPU-hotplug onlining process, which results in lockdep > splats as follows: > > WARNING: suspicious RCU usage > ----------------------------- > kernel/locking/lockdep.c:3497 RCU-list traversed in non-reader section!! > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] arm64/smp: Move rcu_cpu_starting() earlier https://git.kernel.org/arm64/c/ce3d31ad3cac Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev