From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756969AbYESBbl (ORCPT ); Sun, 18 May 2008 21:31:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752732AbYESBbe (ORCPT ); Sun, 18 May 2008 21:31:34 -0400 Received: from saeurebad.de ([85.214.36.134]:53168 "EHLO saeurebad.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752555AbYESBbd (ORCPT ); Sun, 18 May 2008 21:31:33 -0400 From: Johannes Weiner To: KAMEZAWA Hiroyuki Cc: Linux Kernel Mailing List , Linux MM Mailing List Subject: Re: bootmem: Double freeing a PFN on nodes spanning other nodes References: <87skwhyj8g.fsf@saeurebad.de> <20080519093525.4867bfb4.kamezawa.hiroyu@jp.fujitsu.com> Date: Mon, 19 May 2008 03:31:10 +0200 In-Reply-To: <20080519093525.4867bfb4.kamezawa.hiroyu@jp.fujitsu.com> (KAMEZAWA Hiroyuki's message of "Mon, 19 May 2008 09:35:25 +0900") Message-ID: <87d4njulk1.fsf@saeurebad.de> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org KAMEZAWA Hiroyuki writes: > On Sat, 17 May 2008 00:30:55 +0200 > Johannes Weiner wrote: > >> Hi, >> >> When memory nodes overlap each other, the bootmem allocator is not aware >> of this and might pass the same page twice to __free_pages_bootmem(). >> > > 1. init_bootmem_node() is called against a node, [start, end). After this, > all pages are 'allocated'. > 2. free_bootmem_node() is called against available memory in a node. > 3. bootmem allocator is ready. > > memory overlap seems not to be trouble while an arch's code calls > free_bootmem_node() correctly. Ah, I totally overlooked that one. Thank you very much! Hannes