Re: [rfc][patch 2/2] xip: support non-struct page memory

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

Nick Piggin wrote:
> OK, that's good news for my lockless get_user_pages ;)
> 
> And also potentially good news for the whole vm_normal_page scheme...
> though I'd prefer to start simple (ie. don't use the pte bit, rather
> walk the list), and see if it works first.
> 
> But whatever you think I guess, either way it would go in arch specific
> code where your opinion outweighs mine ;)

You clearly overestimate my influence on Martin. I rather keep my 
fingers off the memory management backend there.
But either way, what we'd need is an arch callback that can map to 
pfn_valid() for ARM and maybe others, and that we could map different. 
I'll try to come up with a patch that implements such callback using 
list-walk for s390. Hopefully we can safely grab the list lock 
everywhere we need to check.
Btw: I will also continue to work on this next year, and take two 
weeks christmas vacation.

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