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[PATCH 00/15] libnvdimm: ->rw_bytes(), BLK-mode, unit tests, and misc features

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  [PATCH 00/15] libnvdimm: ->rw_bytes(), BLK-mode, unit tests,  and misc features Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
    [PATCH 12/15] libnvdimm: enable iostat Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
      Re: [PATCH 12/15] libnvdimm: enable iostat Christoph Hellwig <hch@lst.de> - 2015-06-19 10:40 +0200
        Re: [PATCH 12/15] libnvdimm: enable iostat Dan Williams <dan.j.williams@intel.com> - 2015-06-19 11:10 +0200
          Re: [PATCH 12/15] libnvdimm: enable iostat Christoph Hellwig <hch@lst.de> - 2015-06-21 12:20 +0200
    [PATCH 07/15] fs/block_dev.c: skip rw_page if bdev has integrity Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
    [PATCH 13/15] libnvdimm: flag libnvdimm block devices as  non-rotational Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
    [PATCH 01/15] block: introduce an ->rw_bytes() block device  operation Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
      Re: [PATCH 01/15] block: introduce an ->rw_bytes() block device operation Dan Williams <dan.j.williams@intel.com> - 2015-06-18 21:30 +0200
    [PATCH 09/15] libnvdimm, blk: add support for blk integrity Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
    [PATCH 15/15] libnvdimm, nfit: handle acpi_nfit_memory_map flags Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:00 +0200
    [PATCH 11/15] libnvdimm: pmem, blk, and btt make_request cleanups Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:10 +0200
      Re: [PATCH 11/15] libnvdimm: pmem, blk, and btt make_request  cleanups Christoph Hellwig <hch@lst.de> - 2015-06-21 12:20 +0200
    [PATCH 08/15] libnvdimm, btt: add support for blk integrity Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:10 +0200
    [PATCH 02/15] libnvdimm: infrastructure for btt devices Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:10 +0200
    [PATCH 10/15] libnvdimm: fix up max_hw_sectors Dan Williams <dan.j.williams@intel.com> - 2015-06-18 02:10 +0200
      Re: [PATCH 10/15] libnvdimm: fix up max_hw_sectors Christoph Hellwig <hch@lst.de> - 2015-06-21 12:10 +0200
    Re: [PATCH 03/15] nd_btt: atomic sector updates Christoph Hellwig <hch@lst.de> - 2015-06-21 12:10 +0200
      Re: [PATCH 03/15] nd_btt: atomic sector updates Dan Williams <dan.j.williams@intel.com> - 2015-06-21 18:40 +0200
    Re: [PATCH 04/15] libnvdimm, nfit, nd_blk: driver for BLK-mode  access persistent memory Christoph Hellwig <hch@lst.de> - 2015-06-21 12:10 +0200
      Re: [PATCH 04/15] libnvdimm, nfit, nd_blk: driver for BLK-mode access  persistent memory Dan Williams <dan.j.williams@intel.com> - 2015-06-21 16:50 +0200

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#1169599 — Re: [PATCH 04/15] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory

On Sun, Jun 21, 2015 at 6:56 AM, Christoph Hellwig <hch@lst.de> wrote:
> On Sun, Jun 21, 2015 at 06:31:38AM -0700, Dan Williams wrote:
>> > As mentioned last time only arch asm/ headers may include asm-generic
>> > headers.
>>
>> No, not in this case, there's no other way to define readq()/writeq()
>> on 32-bit builds.  See:
>
> Oh my god.  I think we're both right: no driver should use asm-generic,
> but because someone totally messed this abstraction up you have no choice.
>
> We really should have a linux/*.h header for these that just does the
> right thing.
>
> Btw, what's the reason you're using the hi-lo ordering unlikely everyone
> else?  IMHO that should be an arch and not a driver choice.

If the hardware latches the register on writing the hi or lo bits
first then it matters, otherwise it's arbitrary like it is in this
case.  It's hard to have an arch default because different devices
care about different orderings, so it must be a driver choice afaics.
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