[Bug 215740] kernel warning: DMA-API: xhci_hcd: cacheline tracking EEXIST, overlapping mappings aren't supported

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https://bugzilla.kernel.org/show_bug.cgi?id=215740

--- Comment #25 from Andy Shevchenko (andy.shevchenko@xxxxxxxxx) ---
I'm not sure I understand 'u8 (*buffer)[8]' in the data struct, sounds like 8
pointers, so the side has to be 32/64 bytes. As for the next field, status,
it's a pointer and again 4/8 bytes. I believe we are talking about x86_64 case,
so I fail to see how 1 and 4 map to the struct usb_hub fields. Is the len in
your debug patches is in "long"s units? Then it makes sense if the status is
mapped first (1 long) followed by 4 (out of 8) URB buffer pointers.

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