Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932787Ab2K1V56 (ORCPT ); Wed, 28 Nov 2012 16:57:58 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:44928 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756214Ab2K1Vso (ORCPT ); Wed, 28 Nov 2012 16:48:44 -0500 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jacob Shin Cc: Andrew Morton , Stefano Stabellini , Konrad Rzeszutek Wilk , linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v9 13/46] x86, mm: use pfn_range_is_mapped() with gart Date: Wed, 28 Nov 2012 13:47:24 -0800 Message-Id: <1354139277-17376-14-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1354139277-17376-1-git-send-email-yinghai@kernel.org> References: <1354139277-17376-1-git-send-email-yinghai@kernel.org> X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1430 Lines: 39 We are going to map ram only in patch: x86, mm: Only direct map addresses that are marked as E820_RAM so range under max_low_pfn_mapped, ranges between 4g and max_pfn_mapped could have holes in them and the holes will not be mapped. Use pfn_range_is_mapped() to check if the range is mapped. Signed-off-by: Yinghai Lu Reviewed-by: Konrad Rzeszutek Wilk --- arch/x86/kernel/amd_gart_64.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c index e663112..b574b29 100644 --- a/arch/x86/kernel/amd_gart_64.c +++ b/arch/x86/kernel/amd_gart_64.c @@ -768,10 +768,9 @@ int __init gart_iommu_init(void) aper_base = info.aper_base; end_pfn = (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT); - if (end_pfn > max_low_pfn_mapped) { - start_pfn = (aper_base>>PAGE_SHIFT); + start_pfn = PFN_DOWN(aper_base); + if (!pfn_range_is_mapped(start_pfn, end_pfn)) init_memory_mapping(start_pfn<