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Date:   Wed, 17 Nov 2021 10:37:33 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Joao Martins <joao.m.martins@oracle.com>
Cc:     linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Naoya Horiguchi <naoya.horiguchi@nec.com>,
        Matthew Wilcox <willy@infradead.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        John Hubbard <jhubbard@nvidia.com>,
        Jane Chu <jane.chu@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Christoph Hellwig <hch@lst.de>, nvdimm@lists.linux.dev,
        linux-doc@vger.kernel.org
Subject: Re: [PATCH v5 7/8] device-dax: ensure dev_dax->pgmap is valid for
 dynamic devices
Message-ID: <20211117093733.GB8429@lst.de>
References: <20211112150824.11028-1-joao.m.martins@oracle.com> <20211112150824.11028-8-joao.m.martins@oracle.com>
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> +bool static_dev_dax(struct dev_dax *dev_dax)
> +{
> +	return is_static(dev_dax->region);
> +}
> +EXPORT_SYMBOL_GPL(static_dev_dax);

This function would massively benefit from documentic what a static
DAX region is and why someone would want to care.  Because even as
someone occasionally dabbling with the DAX code I have no idea at all
what that means.