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

[bugzilla-daemon@kernel.org]

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

--- Comment #38 from Ferry Toth (ferry.toth@elsinga.info) ---
With Catalin Marinas's suggestion "force the kmalloc() min align to
cache_line_size()" + attachment 305473

root@yuna:~# journalctl -k | grep hub  
kernel: usbcore: registered new interface driver hub
kernel: hub 1-0:1.0: USB hub found
kernel: usb usb1: hub buffer at 71c7180, status at 71c71c0
kernel: hub 1-0:1.0: 1 port detected
kernel: hub 2-0:1.0: USB hub found
kernel: usb usb2: hub buffer at 71c79c0, status at 71c7a00
kernel: hub 2-0:1.0: 1 port detected
kernel: hub 1-1:1.0: USB hub found
kernel: usb 1-1: hub buffer at 65b36c0, status at 6639340
kernel: hub 1-1:1.0: 7 ports detected

and stack trace goes away.
IOW the 2 root hub kmalloc() are now also aligned to the cache line size, even
though these never triggered the stack trace. Strange: hub's status is aligned
far away from hub buffer.

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