From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757480AbbCEQF4 (ORCPT ); Thu, 5 Mar 2015 11:05:56 -0500 Received: from mga09.intel.com ([134.134.136.24]:31485 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757178AbbCEQFz (ORCPT ); Thu, 5 Mar 2015 11:05:55 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,347,1422950400"; d="scan'208";a="694421967" Message-ID: <1425571502.3838.151.camel@linux.intel.com> Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform From: Alan Cox To: "Rafael J. Wysocki" Cc: Borislav Petkov , Arjan van de Ven , Ingo Molnar , "Li, Aubrey" , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , Len.Brown@intel.com, x86@kernel.org, LKML Date: Thu, 05 Mar 2015 16:05:02 +0000 In-Reply-To: <8129220.9HmyqjfodP@vostro.rjw.lan> References: <54F67ACC.3010500@linux.intel.com> <20150304140555.GG3516@pd.tnic> <1425500461.3838.140.camel@linux.intel.com> <8129220.9HmyqjfodP@vostro.rjw.lan> Organization: Intel Corporation Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.9 (3.12.9-1.fc21) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Besides, the "ACPI reduced hardware" case is kind of a red herring here, > because it most likely is not the only case when we'll want has_8259_pic() > to return 0 (quite likely, we'll want that on all BayTrail-based systems, > for example). No. Only those with ACPI reduced firmware. For others you do want to touch the 8259. It *is* about ACPI reduced. Alan