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Subject: Re: [PATCH 4/4] dax: "Hotplug" persistent memory for use like normal
 RAM
To:     Bjorn Helgaas <bhelgaas@google.com>,
        Dave Hansen <dave.hansen@linux.intel.com>
Cc:     dave@sr71.net, Dan Williams <dan.j.williams@intel.com>,
        Dave Jiang <dave.jiang@intel.com>, zwisler@kernel.org,
        vishal.l.verma@intel.com, thomas.lendacky@amd.com,
        Andrew Morton <akpm@linux-foundation.org>, mhocko@suse.com,
        linux-nvdimm@lists.01.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mm@kvack.org, Huang Ying <ying.huang@intel.com>,
        Wu Fengguang <fengguang.wu@intel.com>,
        Borislav Petkov <bp@suse.de>, baiyaowei@cmss.chinamobile.com,
        Takashi Iwai <tiwai@suse.de>
References: <20190116181859.D1504459@viggo.jf.intel.com>
 <20190116181905.12E102B4@viggo.jf.intel.com>
 <CAErSpo55j7odYf-B-KSoogabD9Qqt605oUGYe6td9wZdYNq_Hg@mail.gmail.com>
From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <f786481c-d38d-5129-318b-cb61b6251c47@intel.com>
Date:   Wed, 16 Jan 2019 13:53:03 -0800
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On 1/16/19 1:16 PM, Bjorn Helgaas wrote:
>> +       /*
>> +        * Set flags appropriate for System RAM.  Leave ..._BUSY clear
>> +        * so that add_memory() can add a child resource.
>> +        */
>> +       new_res->flags = IORESOURCE_SYSTEM_RAM;
> IIUC, new_res->flags was set to "IORESOURCE_MEM | ..." in the
> devm_request_mem_region() path.  I think you should keep at least
> IORESOURCE_MEM so the iomem_resource tree stays consistent.

I went to look at fixing this.  It looks like "IORESOURCE_SYSTEM_RAM"
includes IORESOURCE_MEM:

> #define IORESOURCE_SYSTEM_RAM           (IORESOURCE_MEM|IORESOURCE_SYSRAM)

Did you want the patch to expand this #define, or did you just want to
ensure that IORESORUCE_MEM got in there somehow?