mm/memory: ignore dirty/accessed/soft-dirty bits in folio_pte_batch()

Let's always ignore the accessed/young bit: we'll always mark the PTE as
old in our child process during fork, and upcoming users will similarly
not care.

Ignore the dirty bit only if we don't want to duplicate the dirty bit into
the child process during fork.  Maybe, we could just set all PTEs in the
child dirty if any PTE is dirty.  For now, let's keep the behavior
unchanged, this can be optimized later if required.

Ignore the soft-dirty bit only if the bit doesn't have any meaning in the
src vma, and similarly won't have any in the copied dst vma.

For now, we won't bother with the uffd-wp bit.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Ryan Roberts <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Alexandre Ghiti <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Dinh Nguyen <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Naveen N. Rao <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Russell King (Oracle) <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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