• Jason Gunthorpe's avatar
    RDMA/umem: Use umem->owning_mm inside ODP · f27a0d50
    Jason Gunthorpe authored
    Since ODP had a single struct mmu_notifier located in the ucontext it
    could only handle a single MM at a time, and this prevented it from using
    the new owning_mm system.
    
    With the prior rework it is now simple to let ODP track multiple MMs per
    ucontext, finish the job so that the per_mm is allocated on a mm by mm
    basis, and freed when the last umem is dropped from the ucontext.
    
    As a side effect the new saner locking removes the lockdep splat about
    nesting the umem_rwsem between mmu_notifier_unregister and
    ib_umem_odp_release.
    
    It also makes ODP work with multiple processes, across, fork, etc.
    Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
    Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
    Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
    f27a0d50
ib_umem_odp.h 5.92 KB