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hugetlb: split PTE markers when doing HGM walks
Fix how UFFDIO_CONTINUE and UFFDIO_WRITEPROTECT interact in these two ways: - UFFDIO_WRITEPROTECT no longer prevents a high-granularity UFFDIO_CONTINUE. - UFFD-WP PTE markers installed with UFFDIO_WRITEPROTECT will be properly propagated when high-granularily UFFDIO_CONTINUEs are performed. Note: UFFDIO_WRITEPROTECT is not yet permitted at PAGE_SIZE granularity. Signed-off-by: James Houghton <jthoughton@google.com>
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