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 AA46ECCFA13 for ; Sat, 8 Nov 2025 20:03:13 +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=z1mUJqgslv16M+tfXM8XyUEotZBdEAoMyYYZaLsYGsc=; b=woz+BR7eVE1BpsAJ9tk3ZWe0j3 62fUMvw5TlVExFH2E2wiMfNI9mD9tlQkUQ5LvBFhARqX8FR5LhkZOka5t9NBTydd+fDJfOMGxABsk CnivFHbwgSktVK/1l3jj/ZQQTSf6bbyWJS5y0n55hcuQ0FBY4Oek0ovW+ZG8EwFxQq9e8HI4xJB4x Y5u5uhriZ0sP+O2W/gQQnAehJnvAYFFGzCFF8B98wqEYO1uZyTUvPZeopAqfurr0hsg6B7Dly/jrg Z7NQR/wQ6L+gVSffcoP1GkZBCeL9YJ3b5HuirQbgJ2MP5/4ifdsmJ802ndYj2hRacswAGlo9JQrSh kK9yUVbA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vHp9M-00000003QaD-1tRo; Sat, 08 Nov 2025 20:03:04 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vHp9K-00000003QZp-1OE8 for linux-arm-kernel@lists.infradead.org; Sat, 08 Nov 2025 20:03:03 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 7F52543C09; Sat, 8 Nov 2025 20:03:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 97DD7C19422; Sat, 8 Nov 2025 20:02:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762632180; bh=mZx3reTRacDiFfpeRs79kIi23F+uPMRdn0mb7yCb4lA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=lNKbxfnKqppFyjDbgVviqAKjzuqyrl142Vll5JtXbXhMZx9ScsfOQGWSjhVrVnTF/ W46Amq2iHTbMWiCV73eSF5dNnu4nOzVILXSQ0LwZNmPAfs5De8lf7RP8n0+ocYLUNm Y0VB9/W4SBQYKN1XLrr7dsoUZ4XsZynyKqAhxqqge6RicKHf/c+V+JYIipWSV0NVV8 Lheh82/DHzO8neWxDIm+NArCVP+u2Y2PHaLtEcwgjDMqVCKMgomUWZB9H7QUMJRnik NCFaIIMPr9Rrq/TqyVfDXSRrfIjwbI19FqZ5vVSIzcx/P5X6qOHcwJMWBACW0al3Fw 9iOlOfua0KiDQ== Date: Sat, 8 Nov 2025 20:02:52 +0000 From: Conor Dooley To: Jonathan Cameron , arnd@arndb.de Cc: Catalin Marinas , linux-cxl@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, Dan Williams , "H . Peter Anvin" , Peter Zijlstra , Andrew Morton , Arnd Bergmann , Drew Fustini , Linus Walleij , Alexandre Belloni , Krzysztof Kozlowski , james.morse@arm.com, Will Deacon , Davidlohr Bueso , linuxarm@huawei.com, Yushan Wang , Lorenzo Pieralisi , Mark Rutland , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Andy Lutomirski , Dave Jiang Subject: Re: [PATCH v5 0/6] Cache coherency management subsystem Message-ID: <20251108-spearmint-contend-aa3dd8a0220e@spud> References: <20251031111709.1783347-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="BnXojPaReIke2Qi9" Content-Disposition: inline In-Reply-To: <20251031111709.1783347-1-Jonathan.Cameron@huawei.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251108_120302_450379_82B0B8FD X-CRM114-Status: GOOD ( 19.89 ) 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 --BnXojPaReIke2Qi9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Arnd, On Fri, Oct 31, 2025 at 11:17:03AM +0000, Jonathan Cameron wrote: > Support system level interfaces for cache maintenance as found on some > ARM64 systems. It is expected that systems using other CPU architectures > (such as RiscV) that support CXL memory and allow for native OS flows > will also use this. This is needed for correct functionality during > various forms of memory hotplug (e.g. CXL). Typical hardware has MMIO > interface found via ACPI DSDT. A system will often contain multiple > hardware instances. >=20 > Includes parameter changes to cpu_cache_invalidate_memregion() but no > functional changes for architectures that already support this call. >=20 > How to merge? > - Current suggestion would be via Conor's drivers/cache tree which routes > through the SoC tree. I was gonna put this in linux-next, but I'm not really sure that Arnd was satisfied with the discussion on the previous version about suitability of the directory: https://lore.kernel.org/all/20251028114348.00= 0006ed@huawei.com/ Arnd, did that response satisfy you, or nah? Cheers, Conor. > * Andrew Morton has expressed he is fine with the MM related changes > going via another appropriate tree. > * CXL maintainers expressed that they don't consider it appropriate > to go through theit tree. > * The tiny touching of Arm specific code has an ack from Catalin. --BnXojPaReIke2Qi9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCaQ+h7AAKCRB4tDGHoIJi 0mbmAPoDNoN5c++N+FdbOde62VPsuE/nQLuJqXMbpVYRgssj5gD9HgGSIr/5NCGC GU4C//DABkFlJ0fo45ADpizmnDu8JQ8= =3UFm -----END PGP SIGNATURE----- --BnXojPaReIke2Qi9--