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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 927EFC2BD0C for ; Tue, 13 Oct 2020 23:51:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 658C122203 for ; Tue, 13 Oct 2020 23:51:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602633081; bh=cLD0EoT1as7UWU9dvHeFnQBMl2LIji4Fn+A6+nPEf1o=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=ELZEYnbetd0jMR32kcPfuEDb7Q60O2mPRtihscK6yHJ1rsEGSUvQrTIX4TRWiPozy hKiKrpnJAMsWRktxnbtGXmgd7TkKZEsYROPVlTLrs38x5j88uHcV0mWguRf1kvW76e +cUGWUqkzzn1dK+C8rMUciULxwxMhiw89gwKooC4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387772AbgJMXvV (ORCPT ); Tue, 13 Oct 2020 19:51:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:35744 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730401AbgJMXvF (ORCPT ); Tue, 13 Oct 2020 19:51:05 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 75CE1221FF; Tue, 13 Oct 2020 23:51:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602633063; bh=cLD0EoT1as7UWU9dvHeFnQBMl2LIji4Fn+A6+nPEf1o=; h=Date:From:To:Subject:In-Reply-To:From; b=HbMifo9asykF0mB3iSW6n/40BDW+UWtLNo3iigh/VHi6W7tdTAYI+tw/uDeoW7XvZ M2WxiOvhkQgN9AbJQUcNMR5S/gDqbgv4noMbryEWjGIF3pdpcUwMzFL9HK+GGE0PCc JHL2DbM42gGq6DVs2X6V6sJRO+aDHc3UpMh3S/pc= Date: Tue, 13 Oct 2020 16:51:00 -0700 From: Andrew Morton To: airlied@linux.ie, akpm@linux-foundation.org, ard.biesheuvel@linaro.org, ardb@kernel.org, benh@kernel.crashing.org, bhelgaas@google.com, boris.ostrovsky@oracle.com, bp@alien8.de, Brice.Goglin@inria.fr, bskeggs@redhat.com, catalin.marinas@arm.com, dan.j.williams@intel.com, daniel@ffwll.ch, dave.hansen@linux.intel.com, dave.jiang@intel.com, david@redhat.com, gregkh@linuxfoundation.org, hpa@zytor.com, hulkci@huawei.com, ira.weiny@intel.com, jgg@mellanox.com, jglisse@redhat.com, jgross@suse.com, jmoyer@redhat.com, joao.m.martins@oracle.com, Jonathan.Cameron@huawei.com, justin.he@arm.com, linux-mm@kvack.org, lkp@intel.com, luto@kernel.org, mingo@redhat.com, mm-commits@vger.kernel.org, mpe@ellerman.id.au, pasha.tatashin@soleen.com, paulus@ozlabs.org, peterz@infradead.org, rafael.j.wysocki@intel.com, rdunlap@infradead.org, richard.weiyang@linux.alibaba.com, rppt@linux.ibm.com, sstabellini@kernel.org, tglx@linutronix.de, thomas.lendacky@amd.com, torvalds@linux-foundation.org, vgoyal@redhat.com, vishal.l.verma@intel.com, will@kernel.org, yanaijie@huawei.com Subject: [patch 050/181] dax/hmem: introduce dax_hmem.region_idle parameter Message-ID: <20201013235100.MoD9dDoUH%akpm@linux-foundation.org> In-Reply-To: <20201013164658.3bfd96cc224d8923e66a9f4e@linux-foundation.org> User-Agent: s-nail v14.8.16 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org =46rom: Joao Martins Subject: dax/hmem: introduce dax_hmem.region_idle parameter Introduce a new module parameter for dax_hmem which initializes all region devices as free, rather than allocating a pagemap for the region by default. All hmem devices created with dax_hmem.region_idle=3D1 will have full available size for creating dynamic dax devices. Link: https://lkml.kernel.org/r/159643106460.4062302.5868522341307530091.st= git@dwillia2-desk3.amr.corp.intel.com Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracl= e.com Link: https://lkml.kernel.org/r/160106119033.30709.11249962152222193448.stg= it@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Joao Martins Signed-off-by: Dan Williams Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Ard Biesheuvel Cc: Benjamin Herrenschmidt Cc: Ben Skeggs Cc: Bjorn Helgaas Cc: Borislav Petkov Cc: Boris Ostrovsky Cc: Brice Goglin Cc: Catalin Marinas Cc: Daniel Vetter Cc: Dave Hansen Cc: Dave Jiang Cc: David Airlie Cc: David Hildenbrand Cc: Greg Kroah-Hartman Cc: "H. Peter Anvin" Cc: Hulk Robot Cc: Ingo Molnar Cc: Ira Weiny Cc: Jason Gunthorpe Cc: Jason Yan Cc: Jeff Moyer Cc: "J=C3=A9r=C3=B4me Glisse" Cc: Jia He Cc: Jonathan Cameron Cc: Juergen Gross Cc: kernel test robot Cc: Michael Ellerman Cc: Mike Rapoport Cc: Paul Mackerras Cc: Pavel Tatashin Cc: Peter Zijlstra Cc: "Rafael J. Wysocki" Cc: Randy Dunlap Cc: Stefano Stabellini Cc: Thomas Gleixner Cc: Tom Lendacky Cc: Vishal Verma Cc: Vivek Goyal Cc: Wei Yang Cc: Will Deacon Signed-off-by: Andrew Morton --- drivers/dax/hmem/hmem.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/dax/hmem/hmem.c~dax-hmem-introduce-dax_hmemregion_idle-parame= ter +++ a/drivers/dax/hmem/hmem.c @@ -5,6 +5,9 @@ #include #include "../bus.h" =20 +static bool region_idle; +module_param_named(region_idle, region_idle, bool, 0644); + static int dax_hmem_probe(struct platform_device *pdev) { struct device *dev =3D &pdev->dev; @@ -30,7 +33,7 @@ static int dax_hmem_probe(struct platfor data =3D (struct dev_dax_data) { .dax_region =3D dax_region, .id =3D -1, - .size =3D resource_size(res), + .size =3D region_idle ? 0 : resource_size(res), }; dev_dax =3D devm_create_dev_dax(&data); if (IS_ERR(dev_dax)) _