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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20210614201435.1379188-27-willy@infradead.org> References: <20210614201435.1379188-27-willy@infradead.org> <20210614201435.1379188-1-willy@infradead.org> To: "Matthew Wilcox (Oracle)" Cc: dhowells@redhat.com, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Jeff Layton , "Kirill A . Shutemov" , Vlastimil Babka , William Kucharski Subject: Re: [PATCH v11 26/33] mm/writeback: Add folio_wait_writeback() MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <815892.1623839446.1@warthog.procyon.org.uk> Date: Wed, 16 Jun 2021 11:30:46 +0100 Message-ID: <815893.1623839446@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 7D5248019732 Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="X/Atll6p"; spf=none (imf27.hostedemail.com: domain of dhowells@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=dhowells@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: gi4n9fsghkxc9xd4b118d65jxguoupz3 X-HE-Tag: 1623839444-765813 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: Matthew Wilcox (Oracle) wrote: > + struct page *page = &folio->page; Isn't that a layering violation? Should it be something like: struct page *page = folio_head(); or: struct page *page = folio_subpage(0); maybe?