IB/{core,hw}: Have ib_umem_get extract the ib_ucontext from ib_udata
ib_umem_get() can only be called in a method callback, which always has a udata parameter. This allows ib_umem_get() to derive the ucontext pointer directly from the udata without requiring the drivers to find it in some way or another. Signed-off-by: NJason Gunthorpe <jgg@mellanox.com> Signed-off-by: NShamir Rabinovitch <shamir.rabinovitch@oracle.com>
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