Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752429AbbDBKBo (ORCPT ); Thu, 2 Apr 2015 06:01:44 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:37036 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751023AbbDBKBm (ORCPT ); Thu, 2 Apr 2015 06:01:42 -0400 Date: Thu, 2 Apr 2015 12:01:35 +0200 From: Ingo Molnar To: Aravind Gopalakrishnan Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, bp@suse.de, bhelgaas@google.com, linux-kernel@vger.kernel.org, Suravee.Suthikulpanit@amd.com, joro@8bytes.org Subject: Re: [PATCH] x86, aperture: Check for GART before accessing GART registers Message-ID: <20150402100135.GA5210@gmail.com> References: <1427898728-3434-1-git-send-email-Aravind.Gopalakrishnan@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1427898728-3434-1-git-send-email-Aravind.Gopalakrishnan@amd.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 642 Lines: 18 * Aravind Gopalakrishnan wrote: > GART registers are not present in newer processors (Fam15h, Model 10h > and later). So, avoid accesses to GART registers in PCI config > space by returning early in early_gart_iommu_check() and > gart_iommu_hole_init() if GART is not available. In what fashion did this problem manifest itself on real systems? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/