[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 #28 from Alan Stern (stern@xxxxxxxxxxxxxxxxxxx) ---
Yes, that one.

The issue of "which mapping is the problematic one" is more or less irrelevant.
The warning is issued when the second mapping is created.  The order of the two
mappings doesn't matter, just the fact that they refer to the same cache line.

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