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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A512C433FE for ; Mon, 24 Jan 2022 07:41:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BA3886B0081; Mon, 24 Jan 2022 02:41:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B53D96B0083; Mon, 24 Jan 2022 02:41:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A43A26B0085; Mon, 24 Jan 2022 02:41:56 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0136.hostedemail.com [216.40.44.136]) by kanga.kvack.org (Postfix) with ESMTP id 93BE56B0081 for ; Mon, 24 Jan 2022 02:41:56 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 4E34B181C442E for ; Mon, 24 Jan 2022 07:41:56 +0000 (UTC) X-FDA: 79064386632.17.CC896E5 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf02.hostedemail.com (Postfix) with ESMTP id D6F168001C for ; Mon, 24 Jan 2022 07:41:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=Z1SKDv0bpVZtdYt8dV9PbGHjlVKjS9CGxhne7lpfIKs=; b=HDx06FnTRYyxKVIj4EE9rnXWHR oiX3X8ki7OsTBxHU1B468OnIK+t4wbC2mMm+eTg1RE1Izzbtpqk0hEtjppLoUoqXaQVd41SRDycBE o+BiRhtMnaVtuAO9mTsT5Co0aSry0x+9DqkE+zoKL2SJg1Kj0UBTHJneqpktcKNdpv0TAw5ehKiou Zvhgb22eFOr37nP7j4O8ajg6sgJPLGl8n/kzGFjYxVHF4iJ33mXda1kT1rFtYgKBhc2dB9e4yj5nQ +9Nqr1bFfaONIt0aAIpaYOmF+m8p/jHzpk5Z1axhAkUP4gIhwWaHwb2f/zHoww7EzcNMzYFJiZKGi qKbQdIww==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nBtyv-002VxD-Ad; Mon, 24 Jan 2022 07:41:41 +0000 Date: Sun, 23 Jan 2022 23:41:41 -0800 From: Christoph Hellwig To: Muchun Song Cc: dan.j.williams@intel.com, willy@infradead.org, jack@suse.cz, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, apopple@nvidia.com, shy828301@gmail.com, rcampbell@nvidia.com, hughd@google.com, xiyuyang19@fudan.edu.cn, kirill.shutemov@linux.intel.com, zwisler@kernel.org, linux-fsdevel@vger.kernel.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 4/5] dax: fix missing writeprotect the pte entry Message-ID: References: <20220121075515.79311-1-songmuchun@bytedance.com> <20220121075515.79311-4-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220121075515.79311-4-songmuchun@bytedance.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: D6F168001C X-Stat-Signature: o4pnzun9naxh6mpeonm4z3sbwa7a355u Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=HDx06FnT; dmarc=none; spf=none (imf02.hostedemail.com: domain of BATV+b18af077b488c69bdec9+6728+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+b18af077b488c69bdec9+6728+infradead.org+hch@bombadil.srs.infradead.org X-HE-Tag: 1643010115-498126 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 Fri, Jan 21, 2022 at 03:55:14PM +0800, Muchun Song wrote: > Reuse some infrastructure of page_mkclean_one() to let DAX can handle > similar case to fix this issue. Can you split out some of the infrastructure changes into proper well-documented preparation patches? > + pgoff_t pgoff_end = pgoff_start + npfn - 1; > > i_mmap_lock_read(mapping); > - vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) { > - struct mmu_notifier_range range; > - unsigned long address; > - > + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff_start, pgoff_end) { Please avoid the overly long lines here. Just using start and end might be an easy option.