powerpc/64s: __find_linux_pte() synchronization vs pmdp_invalidate()
The change to pmdp_invalidate() to mark the pmd with _PAGE_INVALID broke the synchronisation against lock free lookups, __find_linux_pte()'s pmd_none() check no longer returns true for such cases. Fix this by adding a check for this condition as well. Fixes: da7ad366 ("powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit") Cc: stable@vger.kernel.org # v4.20+ Suggested-by:Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Reviewed-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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