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    SubjectRe: [RFC PATCH 19/26] hugetlb: add HGM support for copy_hugetlb_page_range
    On 06/24/22 17:36, James Houghton wrote:
    > This allows fork() to work with high-granularity mappings. The page
    > table structure is copied such that partially mapped regions will remain
    > partially mapped in the same way for the new process.
    >
    > Signed-off-by: James Houghton <jthoughton@google.com>
    > ---
    > mm/hugetlb.c | 74 +++++++++++++++++++++++++++++++++++++++++-----------
    > 1 file changed, 59 insertions(+), 15 deletions(-)

    FYI -
    With https://lore.kernel.org/linux-mm/20220621235620.291305-5-mike.kravetz@oracle.com/
    copy_hugetlb_page_range() should never be called for shared mappings.
    Since HGM only works on shared mappings, code in this patch will never
    be executed.

    I have a TODO to remove shared mapping support from copy_hugetlb_page_range.
    --
    Mike Kravetz

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