Re: [PATCH] powerpc: warn on emulation of dcbz instruction

[Benjamin Herrenschmidt]

On Thu, 2021-09-16 at 14:36 +0000, David Laight wrote:
> > Does userspace accesses non-cached memory directly ?
> 
> 
> It probably can if a driver mmaps PCI space directly into user space.
> 
> That certainly works on x86-64.

The posterchild for that is Xorg

Cheers,
Ben.