From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261778AbVCYUoG (ORCPT ); Fri, 25 Mar 2005 15:44:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261795AbVCYUoG (ORCPT ); Fri, 25 Mar 2005 15:44:06 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:46304 "EHLO e6.ny.us.ibm.com") by vger.kernel.org with ESMTP id S261778AbVCYUn7 (ORCPT ); Fri, 25 Mar 2005 15:43:59 -0500 Subject: resubmit - [PATCH 1/4] sparsemem base: early_pfn_to_nid() (works before sparse is initialized) To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Dave Hansen , apw@shadowen.org From: Dave Hansen Date: Fri, 25 Mar 2005 12:43:56 -0800 Message-Id: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org We _know_ which node pages in general belong to, at least at a very gross level in node_{start,end}_pfn[]. Use those to target the allocations of pages. Signed-off-by: Andy Whitcroft Signed-off-by: Dave Hansen --- memhotplug-dave/arch/i386/mm/discontig.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+) diff -puN arch/i386/mm/discontig.c~FROM-MM-add-early_pfn_to_nid arch/i386/mm/discontig.c --- memhotplug/arch/i386/mm/discontig.c~FROM-MM-add-early_pfn_to_nid 2005-03-25 08:17:12.000000000 -0800 +++ memhotplug-dave/arch/i386/mm/discontig.c 2005-03-25 08:17:12.000000000 -0800 @@ -149,6 +149,21 @@ static void __init find_max_pfn_node(int BUG(); } +/* Find the owning node for a pfn. */ +int early_pfn_to_nid(unsigned long pfn) +{ + int nid; + + for_each_node(nid) { + if (node_end_pfn[nid] == 0) + break; + if (node_start_pfn[nid] <= pfn && node_end_pfn[nid] >= pfn) + return nid; + } + + return 0; +} + /* * Allocate memory for the pg_data_t for this node via a crude pre-bootmem * method. For node zero take this from the bottom of memory, for _