NVMe: Use PRP2 for the nvme_identify ioctl
DMA the result straight to userspace instead of bounce-buffering in the
kernel.
Signed-off-by: 
Matthew Wilcox <matthew.r.wilcox@intel.com>
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DMA the result straight to userspace instead of bounce-buffering in the
kernel.
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>