re: Unaligned access in kernel on ARMv6+ (Re: CVS commit: src/sys/dev/usb)

[matthew green <mrg%eterna.com.au@localhost>]

> http://netbsd.org/~kamil/kubsan/0007-boot-real-hardware.txt

for xhci, all of these seem to be the same issue and it
appears to be a "high level allocator doesn't know what
it is allocating and does not align properly".  the
problem is likely:

#define XHCI_TRB_ALIGN 16
struct xhci_trb {
...
} __packed __aligned(XHCI_TRB_ALIGN);   

which is included in:

struct xhci_softc {
...
        struct xhci_trb sc_result_trb;


... how do we convey the structure alignment needed for
softc, or do we fix it by moving it into its own separate
aligned allocation?


.mrg.