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=-3.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 72355C433ED for ; Thu, 15 Apr 2021 22:24:39 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 31E43610FB for ; Thu, 15 Apr 2021 22:24:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 31E43610FB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=kHIU5M+KwAgjw4pZwsa96npTXhJWWLhhHragSfFASZg=; b=rNDpQdp7Elkz2Yp1eFI1zow80 lF7/YOAvEob7iSJZEG4zv46dBkq7DFHr27/HcY+fizHFUYm/xE6+f/wlRmjb96yMN4mNimKQSjpLq 9SCUeBZXmsOTQj9ksouAYK1yUloD5+Ovu1VdL+dkTGK6HipKQD1o/Fyz8mn7ff4+K0ZAm31+cRJ+p zpiZ5UCmzyjC28ov1rXjHBFYrFjsYMmQm6GmZNg1SHe0DYag7+8aa9I8SZjTEyKdwMltf59u4WdKs L3E2Y9W077cLzRynxwtxgW0ckdrO3P8hBXyGGN8T9fUA4CjgT0kAjMmNL/CPMJNtkXzMZwpOntrHy Va09yG+Ug==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lXANj-00HW8e-Hn; Thu, 15 Apr 2021 22:22:39 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lXANc-00HW8J-LO for linux-arm-kernel@desiato.infradead.org; Thu, 15 Apr 2021 22:22:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=yCQQJkhIcMUmiG+jHzQ5AkwvKN7ARCVTOi/VwlhPfFg=; b=G7souXSd1HEpHpbqWUh5lxEnqG 72yPOet6m6dISSd7axpLwF1GuIay1RV/45F6tKEj6BDbJeHO2gR22kOlntma0FZZPbcvmmD/MXrGS ZotJA+5b3Jkfa2AaHAwGam44BVigQtO2OUUWx5K1MxtG1pZ5CiucXxAz7iHzXIdBtZHCcO6t1Akn0 Jf6e7BP75Cnv6p6VHUjizlw9iKFlwP1TXfBnuT7H8BBwGli/+jYj8lop4Y87z4ime9iPQZllplUcx wCGblTZ9lVpuPqcW+hkdOWg1I0lN04CeqlSLB7/d6d7euI/yXPCIGsLBBIFSox+o2XhR8MFrZidLv V60jL89w==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lXANH-0099VJ-Ux; Thu, 15 Apr 2021 22:22:19 +0000 Date: Thu, 15 Apr 2021 23:22:11 +0100 From: Matthew Wilcox To: David Laight Cc: Jesper Dangaard Brouer , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , Ilias Apalodimas , Matteo Croce , Grygorii Strashko , Arnd Bergmann , Christoph Hellwig Subject: Re: [PATCH 1/1] mm: Fix struct page layout on 32-bit systems Message-ID: <20210415222211.GG2531743@casper.infradead.org> References: <20210411103318.GC2531743@casper.infradead.org> <20210412011532.GG2531743@casper.infradead.org> <20210414101044.19da09df@carbon> <20210414115052.GS2531743@casper.infradead.org> <20210414211322.3799afd4@carbon> <20210414213556.GY2531743@casper.infradead.org> <20210415200832.32796445@carbon> <20210415182155.GD2531743@casper.infradead.org> <5179a01a462f43d6951a65de2a299070@AcuMS.aculab.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <5179a01a462f43d6951a65de2a299070@AcuMS.aculab.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Apr 15, 2021 at 09:11:56PM +0000, David Laight wrote: > Isn't it possible to move the field down one long? > This might require an explicit zero - but this is not a common > code path - the extra write will be noise. Then it overlaps page->mapping. See emails passim. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel