linux-kernel - Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io memory.

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Message-ID: <20170331070950.GA9059@infradead.org>
Date:   Fri, 31 Mar 2017 00:09:50 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        linux-pci@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io
 memory.

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.