Re: [rfc][patch 1/4] include: add callbacks to toggle reference counting for VM_MIXEDMAP pages

[Carsten Otte <cotte@de.ibm.com>]

Nick Piggin wrote:
> Hmm, I had it in my mind that this would be entirely hidden in the s390's
> mixedmap_refcount_pfn, but of course you actually need to set the pte too....
I did'nt think about that upfront too.

> In that case, I would rather prefer to go along the lines of my pte_special
> patch, which would replace all of vm_normal_page (on a per-arch basis), and
> you wouldn't need this mixedmap_refcount_* stuff (it can stay pfn_valid for
> those architectures that don't implement pte_special).
I am going to play with PTE_SPECIAL next.  I tend to agree with you 
that the
PTE_SPECIAL path looks more promising than the one implemented in this 
patch
series because it offers a more generic meaning for our valuable pte 
bit which
can be used for various purposes by core-vm.
Let's just implement them all, and figure the best one after that ;-).

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