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=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 47796C433E0 for ; Sun, 26 Jul 2020 11:46:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 226D2206D8 for ; Sun, 26 Jul 2020 11:46:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="Y4tMSRGb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726732AbgGZLqm (ORCPT ); Sun, 26 Jul 2020 07:46:42 -0400 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:11912 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725794AbgGZLqm (ORCPT ); Sun, 26 Jul 2020 07:46:42 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Sun, 26 Jul 2020 04:45:13 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Sun, 26 Jul 2020 04:46:41 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Sun, 26 Jul 2020 04:46:41 -0700 Received: from [10.24.37.103] (172.20.13.39) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sun, 26 Jul 2020 11:46:29 +0000 Subject: Re: [PATCH -next] arm64: Export __cpu_logical_map To: Sudeep Holla , Kefeng Wang CC: Catalin Marinas , Will Deacon , Mikko Perttunen , Viresh Kumar , Hulk Robot , "linux-kernel@vger.kernel.org List" , , Sumit Gupta , Bibek Basu References: <20200724030433.22287-1-wangkefeng.wang@huawei.com> <82f750c4-d423-1ed8-a158-e75153745e07@huawei.com> <20200724131059.GB6521@bogus> From: Sumit Gupta Message-ID: <00cf6e67-16ed-872d-2c16-0ceea6b6f514@nvidia.com> Date: Sun, 26 Jul 2020 17:16:27 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200724131059.GB6521@bogus> X-Originating-IP: [172.20.13.39] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1595763913; bh=g94Wu67n5RZjhKkaJ+xeY3ndTckRMdJqobOgyGCi+/0=; h=X-PGP-Universal:Subject:To:CC:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=Y4tMSRGbI6/makO3NIdpKmdsR4VJ2wNlFQDmHtTPH3P4fRtjuJejU4CdzjAR7qowK BWYXh5cZrw0NT+ejjKSTVmozZi2meJpfT8h7TC3Jdy/6En0Q+Q0Y14XHkGIOhu6QRK dYzMrgldjNbRl20DLBI5URvDvwEYBZcQBWkph6MPOEr07fYgW4/jsqp3wGLzN4jPOd SOJ9CXp6Z5M4mkpGbbmYLs0Vp5C9lZg/ZawqE2egxIHIzdbGi4lvX5T+hbwSDEqwP6 fqBeMuxi+lQrGZSP2W6UsKbLk1rqnbfTk6KMiMDkxNhhNK+mm6u/oUfDVDnXiOP29h C4ipl48yTJxkQ== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> ERROR: modpost: "__cpu_logical_map" [drivers/cpufreq/tegra194-cpufreq.ko] undefined! >>> >>> ARM64 tegra194-cpufreq driver use cpu_logical_map, export >>> __cpu_logical_map to fix build issue. >>> > > I wonder why like other instances in the drivers, the mpidr is not get > directly from the cpu. The cpufreq_driver->init call happens when the cpu > is being brought online and is executed on the required cpu IIUC. > Yes, this occurs during hotplug case. But in the case of system boot, 'cpufreq_driver->init' is called later during cpufreq platform driver's probe. The value of CPU in 'policy->cpu' can be different from the current CPU. That's why read_cpuid_mpidr() can't be used. > read_cpuid_mpidr() is inline and avoids having to export the logical_cpu_map. > Though we may not add physical hotplug anytime soon, less dependency > on this cpu_logical_map is better given that we can resolve this without > the need to access the map. > > -- > Regards, > Sudeep >