From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE403C433FE for ; Fri, 4 Dec 2020 17:43:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6B7D422A83 for ; Fri, 4 Dec 2020 17:43:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B7D422A83 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 890196B005C; Fri, 4 Dec 2020 12:43:34 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 819376B005D; Fri, 4 Dec 2020 12:43:34 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6E0596B006E; Fri, 4 Dec 2020 12:43:34 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0223.hostedemail.com [216.40.44.223]) by kanga.kvack.org (Postfix) with ESMTP id 535166B005C for ; Fri, 4 Dec 2020 12:43:34 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 14B43824999B for ; Fri, 4 Dec 2020 17:43:34 +0000 (UTC) X-FDA: 77556321948.18.point52_1d080cd273c6 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id C3502100ED3C8 for ; Fri, 4 Dec 2020 17:43:33 +0000 (UTC) X-HE-Tag: point52_1d080cd273c6 X-Filterd-Recvd-Size: 3820 Received: from hqnvemgate24.nvidia.com (hqnvemgate24.nvidia.com [216.228.121.143]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Fri, 4 Dec 2020 17:43:32 +0000 (UTC) Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Fri, 04 Dec 2020 09:43:31 -0800 Received: from [10.26.72.142] (172.20.13.39) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 4 Dec 2020 17:43:23 +0000 Subject: Re: [PATCH] mm/memblock:use a more appropriate order calculation when free memblock pages To: Marek Szyprowski , Qian Cai , , CC: , , , Hailong Liu , Stephen Rothwell , Linux Next Mailing List , Bartlomiej Zolnierkiewicz , linux-tegra References: <20201203152311.5272-1-carver4lio@163.com> From: Jon Hunter Message-ID: <3d709122-0364-5bca-9247-3f212096b389@nvidia.com> Date: Fri, 4 Dec 2020 17:43:21 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [172.20.13.39] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1607103811; bh=IgGdlLuQS16IZLAWFCNIGBVZxQ+IIVFfpXGYwQb1klc=; h=Subject:To:CC:References:From:Message-ID:Date:User-Agent: MIME-Version:In-Reply-To:Content-Type:Content-Language: Content-Transfer-Encoding:X-Originating-IP:X-ClientProxiedBy; b=FVg+MJmjt2AMhdRUox9urOJdfPsfGxCByjMrp+4uu3Dimtf4Y4VONLwIJtOgWp7Ny bK4V2Q8gpRAfwbBi9TcvjLoUSankrGmH4PpXQxlIBJ7ACszcbLpwJxhsRdbdOXqfZE 5C9WKJLEvQVyxvG8uPVfGT6CGVDwXYxCOAv+vguJr5f6Wi73F09U4RX+/0zXPtoi4x TVFHPY/TlJrJGPGLvq+hjKh2Uc8omWEWOCKmXjKOjsva1zwvtWT5FpJ8WB+E/o2Ucn cy++evZ3n6CYkMEkKcRAWztAv8u0fj5CWG9OHobpgsQq9ZS5wi30K0bmvtkWrGLoSM KXwn4ItI/GdaA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 04/12/2020 16:07, Marek Szyprowski wrote: > Hi All, > > On 04.12.2020 14:42, Qian Cai wrote: >> On Thu, 2020-12-03 at 23:23 +0800, carver4lio@163.com wrote: >>> From: Hailong Liu >>> >>> When system in the booting stage, pages span from [start, end] of a memblock >>> are freed to buddy in a order as large as possible (less than MAX_ORDER) at >>> first, then decrease gradually to a proper order(less than end) in a loop. >>> >>> However, *min(MAX_ORDER - 1UL, __ffs(start))* can not get the largest order >>> in some cases. >>> Instead, *__ffs(end - start)* may be more appropriate and meaningful. >>> >>> Signed-off-by: Hailong Liu >> Reverting this commit on the top of today's linux-next fixed boot crashes on >> multiple NUMA systems. > > I confirm. Reverting commit 4df001639c84 ("mm/memblock: use a more > appropriate order calculation when free memblock pages") on top of linux > next-20201204 fixed booting of my ARM32bit test systems. FWIW, I also confirm that this is causing several 32-bit Tegra platforms to crash on boot and reverting this fixes the problem. Jon -- nvpublic