Re: [V3, 1/6] powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit

On Thu, 2018-09-20 at 18:09:42 UTC, "Aneesh Kumar K.V" wrote:

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 <redacted>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/da7ad366b497f5fc1d4a416f168057

cheers