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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3366EC3DA42 for ; Mon, 8 Jul 2024 11:36:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MewkH56Qe0my+qWosNr/djCHOinyd+LmIIyKvVe1gtA=; b=bGkkV83agvq+vKB46kD92VoAv5 sNl7wEwT7Bu7ArekMoNvV/KV2l1tzHFdvK2cnemElUCez//Zv6b//xdQDgyz8ztYukd8PdGjQ68bj mPWD5pzjyItP2pNi67fZFv1YE2rextUZYFiium9M6SMnqfG1IZW39OV7JBDBV8LLRUPy7kbDRv5cB XFgEDCnDrYJNEOPnRgqocudBguPx33Lmrxtah+Qid9a1A4ewqdujzGX9ImLITbNflUyl25wSUPh7J qyVcohYeHyRQxMlLx5t+vnXwRGxhrwU2Ee9mkF59H/126xa+aief3JmcPmKUeWV/P0zN8TvrAFakp dlfHo8lA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sQmes-00000003bc3-46xy; Mon, 08 Jul 2024 11:35:50 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sQmed-00000003bVX-0vlH for linux-arm-kernel@lists.infradead.org; Mon, 08 Jul 2024 11:35:36 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 77CF760B8E; Mon, 8 Jul 2024 11:35:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id ACDD9C116B1; Mon, 8 Jul 2024 11:35:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720438534; bh=0q5Ds8WIeOv5Y3nTVZNg0tKqv7bBejypl3Rg0QFJqmI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XsDoAPbDuJawip0mO7VPHOcAtC8umkEX+3mruYsdiHMQTMSnCjk6khCQQhBFOVU2q szsII3oJXeXPXn/TD1fBgYjrRriwN7ffC0ijh8PvFS/JWshQeFdlZKBesvFDDo5JNp ebFxkePURnK0zM1B3jsYHT4MNNEkTpuSUbDOJ0wqE7eJfaQfSWxRo0vWoC5QTabCIW I9ZALOcwRGl2VBpOZP15lKg6qpE8NWgViVA291vGz6q0ajZOlvg0o3swDvw0f3PyCc eOMz086l52tHH0De4Ngoa9ZI+DYKXoJrjaUifAz9HtEFirAu5kGY4AnRE4k3HNrj2S wF50L1Ci27E9g== Date: Mon, 8 Jul 2024 12:35:25 +0100 From: Will Deacon To: Alistair Popple Cc: dan.j.williams@intel.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, david@redhat.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com Subject: Re: [PATCH 13/13] mm: Remove devmap related functions and page table bits Message-ID: <20240708113524.GD11567@willie-the-truck> References: <47c26640cd85f3db2e0a2796047199bb984d1b3f.1719386613.git-series.apopple@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47c26640cd85f3db2e0a2796047199bb984d1b3f.1719386613.git-series.apopple@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240708_043535_344991_65D87191 X-CRM114-Status: UNSURE ( 9.37 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jun 27, 2024 at 10:54:28AM +1000, Alistair Popple wrote: > Now that DAX and all other reference counts to ZONE_DEVICE pages are > managed normally there is no need for the special devmap PTE/PMD/PUD > page table bits. So drop all references to these, freeing up a > software defined page table bit on architectures supporting it. > > Signed-off-by: Alistair Popple > --- > Documentation/mm/arch_pgtable_helpers.rst | 6 +-- > arch/arm64/Kconfig | 1 +- > arch/arm64/include/asm/pgtable-prot.h | 1 +- > arch/arm64/include/asm/pgtable.h | 24 +-------- Not only do you exclusively remove code, but you also give us back a pte bit! What's not to like? Acked-by: Will Deacon # arm64 Will