Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750915Ab0AHFKe (ORCPT ); Fri, 8 Jan 2010 00:10:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750799Ab0AHFKd (ORCPT ); Fri, 8 Jan 2010 00:10:33 -0500 Received: from terminus.zytor.com ([198.137.202.10]:54081 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750748Ab0AHFKd (ORCPT ); Fri, 8 Jan 2010 00:10:33 -0500 Message-ID: <4B46BC6F.5060607@kernel.org> Date: Thu, 07 Jan 2010 21:02:39 -0800 From: "H. Peter Anvin" Organization: Linux Kernel Organization, Inc. User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-3.fc11 Thunderbird/3.0 MIME-Version: 1.0 To: "Zheng, Shaohui" CC: "linux-mm@kvack.org" , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" , "ak@linux.intel.com" , "y-goto@jp.fujitsu.com" , Dave Hansen , "Wu, Fengguang" , "x86@kernel.org" Subject: Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1) References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1039 Lines: 25 On 01/07/2010 07:32 PM, Zheng, Shaohui wrote: > Resend the patch to the mailing-list, the original patch URL is > http://patchwork.kernel.org/patch/69075/, it is not accepted without comments, > sent it again to review. > > Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel > > The new added memory can not be access by interface /dev/mem, because we do not > update the variable high_memory. This patch add a new e820 entry in e820 table, > and update max_pfn, max_low_pfn and high_memory. > > We add a function update_pfn in file arch/x86/mm/init.c to udpate these > varibles. Memory hotplug does not make sense on 32-bit kernel, so we did not > concern it in this function. > Memory hotplug makes sense on 32-bit kernels, at least in virtual environments. -hpa -- 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/