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Date: Fri, 31 Mar 2017 00:09:50 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
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        linux-nvdimm@ml01.01.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io
 memory.
Message-ID: <20170331070950.GA9059@infradead.org>
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 <1490911959-5146-6-git-send-email-logang@deltatee.com>
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You're calling memcpy_{to,from}_iomem on non-__iomem pointers.  This
is a fundamental no-go as we keep I/O memory separate from kernel
pointers.