Subject: Re: [PATCH v5 1/7] powerpc/mm: update ptep_set_access_flag to not do full mm tlb flush

From: Benjamin Herrenschmidt <[email-masked]>
Date: Fri, 25 Nov 2016 19:22:47 +1100

On Fri, 2016-11-25 at 12:35 +0530, Aneesh Kumar K.V wrote:
> Now the question will be how will we support _PAGE_DEVMAP (for
> nvidmm).
> We don't have free software pte bits after we make the above change.
> 
> NOTE: We do have 3 reserved bits(ppc bit 4-6 ) can we use that ?

Yes, I think we can, at least as long as it's a DD1 thing only, future
processors might re-use these.

Cheers,
Ben.