Hello Guys,

Turns out host controller's DMA alignment is often too relax, so two DMA
buffers may cross same cache line easily, and trigger the warning of
"cacheline tracking EEXIST, overlapping mappings aren't supported".

The attached test code can trigger the warning immediately with CONFIG_DMA_API_DEBUG
enabled when reading from one scsi disk which queue DMA alignment is 3.

Thanks,
Ming