[RFC] arm64: mm: use pgprot_device for device in phys_mem_access_prot

[Jisheng Zhang]

On Thu, 21 Jul 2016 17:03:00 +0100 Catalin Marinas wrote:

> On Thu, Jul 21, 2016 at 03:13:44PM +0800, Jisheng Zhang wrote:
> > Normally, in arm64, kernel driver maps register space as device nGnRE. But
> > if we access the register space via. /dev/mem, then the mapping is
> > device nGnRnE, is there a mismatch here?  
> 
> Possibly, but the behaviour is not undefined. The nGnRnE may lose the nE
> behaviour (which is a hint anyway, it may not be honoured).

Got it. Thanks for confirmation.