Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH v6 09/11] mm/memremap_pages: convert to 'struct range'
To:     Dan Williams <dan.j.williams@intel.com>, akpm@linux-foundation.org
Cc:     Paul Mackerras <paulus@ozlabs.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Vivek Goyal <vgoyal@redhat.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Ira Weiny <ira.weiny@intel.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        dave.hansen@linux.intel.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
        david@redhat.com, joao.m.martins@oracle.com
References: <160196728453.2166475.12832711415715687418.stgit@dwillia2-desk3.amr.corp.intel.com>
 <160196733645.2166475.12840692906594512941.stgit@dwillia2-desk3.amr.corp.intel.com>
From:   boris.ostrovsky@oracle.com
Organization: Oracle Corporation
Message-ID: <a2a740e2-424c-69ff-45a6-3d71feac5c50@oracle.com>
Date:   Thu, 8 Oct 2020 15:52:14 -0400
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0)
 Gecko/20100101 Thunderbird/78.3.1
MIME-Version: 1.0
In-Reply-To: <160196733645.2166475.12840692906594512941.stgit@dwillia2-desk3.amr.corp.intel.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Precedence: bulk


On 10/6/20 2:55 AM, Dan Williams wrote:
> The 'struct resource' in 'struct dev_pagemap' is only used for holding
> resource span information.  The other fields, 'name', 'flags', 'desc',
> 'parent', 'sibling', and 'child' are all unused wasted space.
>
> This is in preparation for introducing a multi-range extension of
> devm_memremap_pages().
>
> The bulk of this change is unwinding all the places internal to libnvdimm
> that used 'struct resource' unnecessarily, and replacing instances of
> 'struct dev_pagemap'.res with 'struct dev_pagemap'.range.
>
> P2PDMA had a minor usage of the resource flags field, but only to report
> failures with "%pR".  That is replaced with an open coded print of the
> range.
>
> Link: https://lkml.kernel.org/r/159643103173.4062302.768998885691711532.stgit@dwillia2-desk3.amr.corp.intel.com
> Link: https://lkml.kernel.org/r/20200926121402.GA7467@kadam
> Cc: Paul Mackerras <paulus@ozlabs.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Cc: Vivek Goyal <vgoyal@redhat.com>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Ira Weiny <ira.weiny@intel.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: Juergen Gross <jgross@suse.com>
> Cc: Stefano Stabellini <sstabellini@kernel.org>
> Cc: "Jérôme Glisse" <jglisse@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>


For Xen bits


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>