Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754010Ab2EFQfr (ORCPT ); Sun, 6 May 2012 12:35:47 -0400 Received: from mail-pz0-f51.google.com ([209.85.210.51]:35746 "EHLO mail-pz0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753857Ab2EFQfp convert rfc822-to-8bit (ORCPT ); Sun, 6 May 2012 12:35:45 -0400 MIME-Version: 1.0 In-Reply-To: <20120506151715.GA7773@richard> References: <20120422155202.GA13540@richard> <20120503065455.GA30042@richard> <20120504024721.GA6775@richard> <20120504045205.GA21624@richard> <20120506151715.GA7773@richard> Date: Sun, 6 May 2012 09:35:44 -0700 X-Google-Sender-Auth: 6jCTb9yhEPO5qhIfOeS_JnMwSew Message-ID: Subject: Re: One problem in reassign pci bus number? From: Yinghai Lu To: Richard Yang Cc: Wei Yang , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1539 Lines: 36 On Sun, May 6, 2012 at 8:17 AM, Richard Yang wrote: > On Fri, May 04, 2012 at 10:37:08AM -0700, Yinghai Lu wrote: >>On Thu, May 3, 2012 at 9:52 PM, Richard Yang wrote: >>> >>> BTW, even if this value is returned by __find_res_top_free_size(), or >>> returned after this function is called, the purpose of the >>> __find_res_top_free_size() is to get the biggest free space under the >>> first parameter? >> >>__find_res_top_free_size() is used to get size just under top, ?and >>then use it to calculate size above top that need to be extended. >> >>at last will combine free size under top and allocated size above top >>and return. > Yes, I get the general idea. > > then I want to confirm which size __find_res_top_free_size() will return. > > Come to the previous question, for one resource like this. > res = ? 90-150 > ? ?->child ? ? ?105-140 > We call __find_res_top_free_size(res, 1); > This function should return which size? ?10? 15? or 25? > > From the code > + ? ? ? ? ? ? ? ret = __allocate_resource(res, &tmp_res, n_size, > + ? ? ? ? ? ? ? ? ? ? ? res->end - n_size + skip_nr, res->end, > + ? ? ? ? ? ? ? ? ? ? ? 1, NULL, NULL, false); > I think it will check the free space near the end of res. yes. it is 15, [141-150] -- 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/