linux-kernel - Re: [PATCH 01/22] scatterlist: Introduce sg

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Message-ID: <18f05078-5b2c-2e9b-c8ad-e23c02942b58@deltatee.com>
Date:   Fri, 14 Apr 2017 09:34:28 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Ming Lin <ming.l@....samsung.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, intel-gfx@...ts.freedesktop.org,
        linux-raid@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-nvdimm@...ts.01.org,
        linux-scsi@...r.kernel.org, fcoe-devel@...n-fcoe.org,
        open-iscsi@...glegroups.com, megaraidlinux.pdl@...adcom.com,
        sparmaintainer@...sys.com, devel@...verdev.osuosl.org,
        target-devel@...r.kernel.org, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
        Steve Wise <swise@...ngridcomputing.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH 01/22] scatterlist: Introduce sg_map helper functions



On 14/04/17 02:35 AM, Christoph Hellwig wrote:
>> +
>>  static inline int is_dma_buf_file(struct file *);
>>  
>>  struct dma_buf_list {
> 
> I think the right fix here is to rename the operation to unmap_atomic
> and send out a little patch for that ASAP.

Ok, I can do that next week.

> I'd rather have separate functions for kmap vs kmap_atomic instead of
> the flags parameter.  And while you're at it just always pass the 0
> offset parameter instead of adding a wrapper..
> 
> Otherwise this looks good to me.

I settled on the flags because I thought the interface could be expanded
to do more things like automatically copy iomem to a bounce buffer (with
a flag). It'd also be possible to add things like vmap and
physical_address to the interface which would cover even more sg_page
users. All the implementations would then share the common offset
calculations, and switching between them becomes a matter of changing a
couple flags.

If you're still not convinced by the above arguments  then I'll change
it but I did have reasons for choosing to do it this way.

I am fine with removing the offset versions. I will make that change.

Thanks,

Logan