Rather than directly checking VMA flags, use the newly introduced
vma_is_kernel_owned() and vma_is_persistent() helpers in userfaultfd when
assessing VMA suitability for userfaultfd and UFFDIO_MOVE.
Update vma_move_compatible() so it's expressed in terms of VMA
characteristics rather than arbitrary flags.
Additionally, update the use of the deprecated VMA flag API when checking
VMA_SHADOW_STACK_BIT.
A VMA_IO_BIT check is no longer required but that is fine as a hard
invariant has been established that only kernel-owned mappings may set
VMA_IO_BIT so the check is now redundant.
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great!
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Sashiko AI review · https://sashiko.dev/#/patchset/20260908-b4-mmap-prepare-vma-flag-sanify-v1-0-dacf19cce22b@kernel.org?part=31