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

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

On 06/01/2019 15:31, Christos Zoulas wrote:
> On Jan 6,  9:53am, nick.hudson%gmx.co.uk@localhost (Nick Hudson) wrote:
> -- Subject: Re: Unaligned access in kernel on ARMv6+ (Re: CVS commit: src/sys
>
> | I'm pretty sure this is the same as http://gnats.netbsd.org/50038
>
> Yes, this looks like the same issue; we should not be patching individual
> drivers like this. The compiler should be producing correct code that handles
> unaligned access.
>
> | Maybe I should be brave enough to stop using PMAP_NOCACHE in bus_dma.c
> | for armv6+ and fix any missing bus_dmamap_sync calls.
>
> Isn't that orthogonal?

Nope, because normal cached memory allows unaligned access (kernel and 
userland).

Nick