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powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit
With this patch we use 0x8000000000000000UL (_PAGE_PRESENT) to indicate a valid pgd/pud/pmd entry. We also switch the p**_present() to look at this bit. With pmd_present, we have a special case. We need to make sure we consider a pmd marked invalid during THP split as present. Right now we clear the _PAGE_PRESENT bit during a pmdp_invalidate. Inorder to consider this special case we add a new pte bit _PAGE_INVALID (mapped to _RPAGE_SW0). This bit is only used with _PAGE_PRESENT cleared. Hence we are not really losing a pte bit for this special case. pmd_present is also updated to look at _PAGE_INVALID. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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