Fix bug in pagetable cache cleanup with CONFIG_PPC_SUBPAGE_PROT

[Sachin Sant]

David Gibson wrote:
> Commit a0668cdc154e54bf0c85182e0535eea237d53146 cleans up the handling
> of kmem_caches for allocating various levels of pagetables.
> Unfortunately, it conflicts badly with CONFIG_PPC_SUBPAGE_PROT, due to
> the latter's cleverly hidden technique of adding some extra allocation
> space to the top level page directory to store the extra information
> it needs.
>
> Since that extra allocation really doesn't fit into the cleaned up
> page directory allocating scheme, this patch alters
> CONFIG_PPC_SUBPAGE_PROT to instead allocate its struct
> subpage_prot_table as part of the mm_context_t.
>
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>
Thanks David for the patch. With this patch on top of next-20091123
my test machine boots fine. 

Regards
-Sachin

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Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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