Re: [PATCH v5 05/21] libnvdimm: control (ioctl) messages for libnvdimm bus and dimm devices

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On Mon, Jun 08, 2015 at 11:57:42PM -0700, Dan Williams wrote:
> Data payload size for one, these commands transfer more than a page
> worth of data at a time.
> 
> Even if we killed the ioctl interface to userspace we still need all
> the ugly data marshaling code in the kernel to craft properly
> formatted ACPI _DSM messages.  I try to share as much common
> infrastructure from the ACPI _DSM implementation to the ioctl
> interface (nd_cmd_dimm_desc() + nd_cmd_bus_desc()).

Ok.  Not a fan of these dual interfaces but in this case they might be
justified.
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