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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5DD5BC2BA4C for ; Wed, 26 Jan 2022 12:29:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241311AbiAZM3E (ORCPT ); Wed, 26 Jan 2022 07:29:04 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:44636 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241298AbiAZM3D (ORCPT ); Wed, 26 Jan 2022 07:29:03 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 06265619C4 for ; Wed, 26 Jan 2022 12:29:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B78AC340E3; Wed, 26 Jan 2022 12:29:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643200142; bh=9EaamjmD9vwFtzb754Mi52eXxFzcSc0EN4SmOkuwgGU=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=MTOeXEL3N2P95u8T/bFZdMHIjmitx0MxOzCQlqZfEV/rpp+upRBh/SsVBx0dRbfWF TyIB9lPtBJNCzyP4ZaCV9VRx+WDN33irj7e5PWaOvpQsdNuVklU0zztKeigEHTeyFV bqKvbXOleFGWiLya93HwHE1WJyQNzqgoELbDX1gafSrKFMhCgmQqQyqSMZP+xQ+pis HFA0VNto8vc3kHTyfwbwtDTLJjnBBamf2tY1kZwi7xJ3rXnpWywHimEFj7eCBsb3lA tnPCbCbzTGD1KvqDHR0JPaFggZchR/+YjrWnHQLc1WWa+a1Y6zGHcHilOcOxeD+I5V v13FUGlvM6OLA== Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nChQ4-003D2u-9y; Wed, 26 Jan 2022 12:29:00 +0000 MIME-Version: 1.0 Date: Wed, 26 Jan 2022 12:29:00 +0000 From: Marc Zyngier To: Robin Murphy Cc: Chao Liu , catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, hewenliang4@huawei.com, zhoukang7@huawei.com Subject: Re: [PATCH v2] add cpu frequency to cpuinfo in arm64 In-Reply-To: References: <20220126092349.285642-1-liuchao173@huawei.com> User-Agent: Roundcube Webmail/1.4.13 Message-ID: X-Sender: maz@kernel.org Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: robin.murphy@arm.com, liuchao173@huawei.com, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, hewenliang4@huawei.com, zhoukang7@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022-01-26 12:05, Robin Murphy wrote: > On 2022-01-26 09:23, Chao Liu wrote: >> There is cpu frequency in /proc/cpuinfo in x86 but not in arm64 > > arm64 cpuinfo also doesn't show the APIC ID or microcode version. > Different architectures are different. > > Besides, x86 cpuinfo only shows MHz if the CPU has X86_FEATURE_TSC, so > for compatibility we should only do this on AArch64 CPUs which have > X86_FEATURE_TSC. /me prepares a patch to be sent in just over 2 months... M. -- Jazz is not dead. It just smells funny...