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=-10.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 B2ECCC433E0 for ; Wed, 3 Feb 2021 01:23:51 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EFB1C64F67 for ; Wed, 3 Feb 2021 01:23:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EFB1C64F67 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4DVkTs5sPYzDwhD for ; Wed, 3 Feb 2021 12:23:45 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=huawei.com (client-ip=45.249.212.191; helo=szxga05-in.huawei.com; envelope-from=dingtianhong@huawei.com; receiver=) Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DVNN86JZ1zDr4m for ; Tue, 2 Feb 2021 22:47:23 +1100 (AEDT) Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4DVNKq0sXyzMSry; Tue, 2 Feb 2021 19:45:35 +0800 (CST) Received: from [10.174.177.80] (10.174.177.80) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.498.0; Tue, 2 Feb 2021 19:47:04 +0800 Subject: Re: [PATCH v12 01/14] ARM: mm: add missing pud_page define to 2-level page tables To: Russell King - ARM Linux admin , Nicholas Piggin References: <20210202110515.3575274-1-npiggin@gmail.com> <20210202110515.3575274-2-npiggin@gmail.com> <20210202111319.GL1463@shell.armlinux.org.uk> From: Ding Tianhong Message-ID: Date: Tue, 2 Feb 2021 19:47:04 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.3.2 MIME-Version: 1.0 In-Reply-To: <20210202111319.GL1463@shell.armlinux.org.uk> Content-Type: text/plain; charset="utf-8" Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.80] X-CFilter-Loop: Reflected X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , linux-mm@kvack.org, Jonathan Cameron , Andrew Morton , Rick Edgecombe , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 2021/2/2 19:13, Russell King - ARM Linux admin wrote: > On Tue, Feb 02, 2021 at 09:05:02PM +1000, Nicholas Piggin wrote: >> diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h >> index c02f24400369..d63a5bb6bd0c 100644 >> --- a/arch/arm/include/asm/pgtable.h >> +++ b/arch/arm/include/asm/pgtable.h >> @@ -166,6 +166,9 @@ extern struct page *empty_zero_page; >> >> extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; >> >> +#define pud_page(pud) pmd_page(__pmd(pud_val(pud))) >> +#define pud_write(pud) pmd_write(__pmd(pud_val(pud))) > > As there is no PUD, does it really make sense to return a valid > struct page (which will be the PTE page) for pud_page(), which is > several tables above? > --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h +static inline int pud_none(pud_t pud) +{ + return 0; +} I think it could be fix like this. Ding