From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757158AbaC0TxG (ORCPT ); Thu, 27 Mar 2014 15:53:06 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:39313 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755024AbaC0TxD (ORCPT ); Thu, 27 Mar 2014 15:53:03 -0400 Message-ID: <53348199.7070207@mit.edu> Date: Thu, 27 Mar 2014 12:52:57 -0700 From: Andy Lutomirski User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Clemens Ladisch , Feng Tang , tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64 References: <1395906309-7519-1-git-send-email-feng.tang@intel.com> <53340561.4050708@ladisch.de> In-Reply-To: <53340561.4050708@ladisch.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/27/2014 04:02 AM, Clemens Ladisch wrote: > Feng Tang wrote: >> On many new phone/tablet platforms like Baytrail/Merrifield etc, >> the HPET are either defeatured or has some problem to be used >> as a reliable timer. As these platforms also have X86_64, we >> should not make HPET_TIMER default y for all X86_64. Wouldn't it be better to fix the hpet driver so that the hpet doesn't used on these platforms? > > The help text still says: > | You can safely choose Y here. [...] > | Choose N to continue using the legacy 8254 timer. > > Are these statements still true for those platforms? They aren't true for modern desktop and server platforms -- the TSC is used regardless of hpet availability. > > > Regards, > Clemens >