From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755641Ab2K1TkV (ORCPT ); Wed, 28 Nov 2012 14:40:21 -0500 Received: from mail-bk0-f46.google.com ([209.85.214.46]:64505 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754928Ab2K1TkU (ORCPT ); Wed, 28 Nov 2012 14:40:20 -0500 MIME-Version: 1.0 In-Reply-To: <20121128170856.GL21266@phenom.dumpdata.com> References: <1353123563-3103-1-git-send-email-yinghai@kernel.org> <1353123563-3103-15-git-send-email-yinghai@kernel.org> <20121128170856.GL21266@phenom.dumpdata.com> Date: Wed, 28 Nov 2012 11:40:19 -0800 X-Google-Sender-Auth: 261TaWYUyGmsB3lMqqW_nYp2-tU Message-ID: Subject: Re: [PATCH v8 14/46] x86, mm: use pfn_range_is_mapped() with reserve_initrd From: Yinghai Lu To: Konrad Rzeszutek Wilk Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jacob Shin , Andrew Morton , Stefano Stabellini , linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 28, 2012 at 9:08 AM, Konrad Rzeszutek Wilk wrote: > On Fri, Nov 16, 2012 at 07:38:51PM -0800, Yinghai Lu wrote: >> We are going to map ram only, so under max_low_pfn_mapped, >> between 4g and max_pfn_mapped does not mean mapped at all. >> >> Use pfn_range_is_mapped() to find out if range is mapped for initrd. >> >> That could happen bootloader put initrd in range but user could > ^- 'if the' ^^^^^-'used' > >> use memmap to carve some of range out. > ^^^-> get rid of that. ^^^^->'ranges' > >> >> Also during copying need to use early_memmap to map original initrd >> for accessing. ===> --- 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 range is mapped for initrd. That could happen if the bootloader put initrd in range but user used "memmap=" to carve some of ranges out. Also during copying need to use early_memmap to map original initrd for accessing. ---