Allow block device drivers to opt-in to receiving bio(s) where the
bio_vec(s) point to memory that is not backed by struct page entries.
When a driver opts in it asserts that it will use the __pfn_t versions of the
dma_map/kmap/scatterlist apis in its bio submission path.
Cc: Tejun Heo
Cc: Jens
Allow block device drivers to opt-in to receiving bio(s) where the
bio_vec(s) point to memory that is not backed by struct page entries.
When a driver opts in it asserts that it will use the __pfn_t versions of the
dma_map/kmap/scatterlist apis in its bio submission path.
Cc: Tejun Heo
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