[PATCH for-4.8 V2 03/10] powerpc/mm/radix: Add radix_set_pte to use in early init

[Nicholas Piggin]

On Mon, 25 Jul 2016 18:36:09 +1000
Michael Ellerman <mpe at ellerman.id.au> wrote:

> "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com> writes:
> 
> > We want to use the static key based feature check in set_pte_at.
> > Since we call radix__map_kernel_page early in boot before jump
> > label is initialized we can't call set_pte_at there. Add
> > radix__set_pte for the same.  
> 
> Although this is an OK solution to this problem, I think it
> highlights a bigger problem, which is that we're still doing the
> feature patching too late.
> 
> If we can move the feature patching prior to MMU init, then all (or
> more of) these problems with pre vs post patching go away.
> 
> I'll see if I can come up with something tomorrow.

Agreed, that would be much nicer if you can make it work.

Thanks,
Nick