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    SubjectRe: [PATCH mm-unstable v1 12/20] RDMA/siw: remove FOLL_FORCE usage
    On Wed, Nov 16, 2022 at 11:26:51AM +0100, David Hildenbrand wrote:
    > GUP now supports reliable R/O long-term pinning in COW mappings, such
    > that we break COW early. MAP_SHARED VMAs only use the shared zeropage so
    > far in one corner case (DAXFS file with holes), which can be ignored
    > because GUP does not support long-term pinning in fsdax (see
    > check_vma_flags()).
    >
    > Consequently, FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM is no longer required
    > for reliable R/O long-term pinning: FOLL_LONGTERM is sufficient. So stop
    > using FOLL_FORCE, which is really only for ptrace access.
    >
    > Cc: Bernard Metzler <bmt@zurich.ibm.com>
    > Cc: Jason Gunthorpe <jgg@ziepe.ca>
    > Cc: Leon Romanovsky <leon@kernel.org>
    > Signed-off-by: David Hildenbrand <david@redhat.com>
    > ---
    > drivers/infiniband/sw/siw/siw_mem.c | 9 ++++-----
    > 1 file changed, 4 insertions(+), 5 deletions(-)

    Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

    Jason

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