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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0F75C54E5D for ; Thu, 14 Mar 2024 08:40:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 59CF780089; Thu, 14 Mar 2024 04:40:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 525DA80073; Thu, 14 Mar 2024 04:40:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3C65A80089; Thu, 14 Mar 2024 04:40:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 2BE3280073 for ; Thu, 14 Mar 2024 04:40:00 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id EB710414D6 for ; Thu, 14 Mar 2024 08:39:59 +0000 (UTC) X-FDA: 81894996918.13.D75D932 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf16.hostedemail.com (Postfix) with ESMTP id 0BB86180017 for ; Thu, 14 Mar 2024 08:39:57 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf16.hostedemail.com: domain of cmarinas@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1710405598; h=from:from:sender: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: in-reply-to:in-reply-to:references:references; bh=PO8cuVRdkKCyIen8lX65LHADwoDDq4W7mw2FII9JFQ8=; b=8aiqCE3OCIp61yYZWvtJ/ZAcOL6Jp7UVri492xTdI7EPwkXndSUOGdow5v3FXVPEu4oDfX 6YT5dgNCeMF6OoL/65zae1qq53B1A30ZolseBvv3eu/wmvHg7eke3NuTECfmKpjy4Zg8ta mNL+Zbq9LRb/yNP9c8/nrVhOGfeLx5U= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf16.hostedemail.com: domain of cmarinas@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1710405598; a=rsa-sha256; cv=none; b=oQWc7cLiqzNQl23gDvFY2rVKJGKKY7kUprs3DMxNgn4u5iOrKCht47sj4HSmiX7N0XNO3i 3U+av/cDo/ZL1j+gkzjnz/WePKgHz5XPodsXFdomJ14hgZGNB9++KjdQjtqCDc6P9jz4Ba o4uX7rIoEzVh7GZ347d74R+b2CPtJc4= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 730DACE1D3E; Thu, 14 Mar 2024 08:39:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F403C433F1; Thu, 14 Mar 2024 08:39:48 +0000 (UTC) Date: Thu, 14 Mar 2024 08:39:46 +0000 From: Catalin Marinas To: "Russell King (Oracle)" Cc: Marek Szyprowski , Sudeep Holla , "Christoph Lameter (Ampere)" , Mark Rutland , "linux-pm@vger.kernel.org" , "Rafael J. Wysocki" , Viresh Kumar , Will Deacon , Jonathan.Cameron@huawei.com, Matteo.Carlini@arm.com, Valentin.Schneider@arm.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, Eric Mackay , dave.kleikamp@oracle.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, robin.murphy@arm.com, vanshikonda@os.amperecomputing.com, yang@os.amperecomputing.com, Nishanth Menon , Stephen Boyd Subject: Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512 Message-ID: References: <37099a57-b655-3b3a-56d0-5f7fbd49d7db@gentwo.org> <9352f410-9dad-ac89-181a-b3cfc86176b8@linux.com> <432c1980-b00f-4b07-9e24-0bec52ccb5d6@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 0BB86180017 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: gmct3nejj73rb869qn69q4c7cu5x6mey X-HE-Tag: 1710405597-729337 X-HE-Meta: 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 8RRC4mSP ubosphCLRuwx8M+BoRTInbbEAVG+TXcalZZCNskfY8TZhch/CG21nWhEYmOvDOQrWthetP7lSpoipT7A= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Mar 13, 2024 at 05:13:33PM +0000, Russell King wrote: > So, I wonder whether what you're seeing is a latent bug which is > being tickled by the presence of the CPU masks being off-stack > changing the kernel timing. > > I would suggest the printk debug approach may help here to see when > the OPPs are begun to be parsed, when they're created etc and their > timing relationship to being used. Given the suspicion, it's possible > that the mere addition of printk() may "fix" the problem, which again > would be another semi-useful data point. It might be an init order problem. Passing "initcall_debug" on the cmdline might help a bit. It would also be useful in dev_pm_opp_set_config(), in the WARN_ON block, to print opp_table->opp_list.next to get an idea whether it looks like a valid pointer or memory corruption. -- Catalin