For v3 of the patchset, I was also considering to add a note to the
kernel-doc comments for dma_pool_create() to use dma_alloc_coherent()
directly instead of a dma pool if the driver intends to allow userspace
to mmap() the returned pages, due to the new use of the _mapcount union
in struct page. Would you consider that useful information or pointless
trivia?
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