I just looked up these two commits in the disco master tree and found that both 
commits are already tagged with 4.19 - hence they are in disco's latest kernel 
5.0:
$ git show bf399c2cadfa66d399d01d5a92a7bb0a112f1568 | head -n 6
commit bf399c2cadfa66d399d01d5a92a7bb0a112f1568
Author: Parav Pandit <pa...@mellanox.com>
Date:   Tue Jun 5 08:40:17 2018 +0300

    IB/core: Introduce GID attribute get, put and hold APIs
    
$ git describe --tags --contains bf399c2cadfa66d399d01d5a92a7bb0a112f1568
v4.19~309^2~312
$ git show b4c296f9c96420b8e7e92466ea5960f10ee20aae | head -n 6
commit b4c296f9c96420b8e7e92466ea5960f10ee20aae
Author: Jason Gunthorpe <j...@mellanox.com>
Date:   Fri Aug 17 16:45:51 2018 -0600

    RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr
    
$ git describe --tags --contains b4c296f9c96420b8e7e92466ea5960f10ee20aae
v4.19~309^2~2
fheimes@T570:~/ubuntu-disco/disco$
Hence closing the ticket as Fix Released.

** Changed in: linux (Ubuntu)
       Status: New => Fix Released

** Changed in: ubuntu-z-systems
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1824101

Title:
  [Ubuntu] RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  If commit bf399c2cadfa66d399d01d5a92a7bb0a112f1568 (RDMA) is applied, 
  the corresponding SMC patch also have to be applied.

  
  Problem Description:
  RDMA/smc: Replace ib_query_gid with rdma_get_gid_attr 

  Symptom: 
  An SMC-R connection cannot be established. The GID value transferred in the 
confirm_link message is empty (i.e. binary zero).

  Problem:
  A change in the RDMA subsystem requires to update the way  to retrieve the 
GID of an RDMA device.

  Upstream-ID:   b4c296f9c96420b8e7e92466ea5960f10ee20aae
  Component  :  kernel

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