powerpc/mm/books3s: Add new pte bit to mark pte temporarily invalid.

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When splitting a huge pmd pte, we need to mark the pmd entry invalid. We
can do that by clearing _PAGE_PRESENT bit. But then that will be taken as a
swap pte. In order to differentiate between the two use a software pte bit
when invalidating.

For regular pte, due to bd5050e38a ("powerpc/mm/radix: Change pte relax
sequence to handle nest MMU hang") we need to mark the pte entry invalid when
relaxing access permission. Instead of marking pte_none which can result in
different page table walk routines possibly skipping this pte entry, invalidate
it but still keep it marked present.

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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Aneesh Kumar K.V 2018-08-22 22:46:04 +05:30 • committed by Michael Ellerman

parent 810e9f86f3

commit bd0dbb73e0

1 changed files with 17 additions and 1 deletions

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arch/powerpc/include/asm/book3s/64/pgtable.h

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