Alan Cox wrote:
That shouldn't be a problem, libata default DMA mask is 32 bits (which
isn't overridden with this controller) and so the block layer will
bounce any data being read/written above that point with IOMMU or
swiotlb. The comment is a bit unnecessarily scary.
Adding a BUG_ON for this would be wise. Its trivial to check and a BUG
rather than corruption if this assumption ever changes would be far
preferable
The default DMA mask -everywhere- is 32 bits.
A lot of code will break if this assumption ever changes, not just libata.
Jeff
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