Public bug reported:

[Impact]
Releases of Mellanox OFED drivers no longer compile against latest focal 
kernel. While Ubuntu can not necessarily guarantee source compatibility with 
3rd party trees, it seems like the MOFED stack has enough users that we'd want 
to avoid breaking it unnecessarily.

[Fix]
Temporarily reverting the following commits until MOFED can release a new 
version that supports them would do the trick:

f21f647e08bd tools headers UAPI: Sync linux/const.h with the kernel headers
37bbb8ed3e93 uapi: move constants from <linux/kernel.h> to <linux/const.h>

[Test Case]
Install MOFED driver stack:

export DEBIAN_FRONTEND=noninteractive
NVIDIA_DRIVER_VERSION=450-server
MELLANOX_OFED_VERSION=5.1-2.5.8.0

install_mellanox_ofed() {
    local MLNX_REPO="https://linux.mellanox.com/public/repo/mlnx_ofed";
    local mlnx_ofed_ver="$1"
    local ubuntu_ver
    ubuntu_ver="$(lsb_release -rs)"
    
mlnx_url="${MLNX_REPO}/${mlnx_ofed_ver}/ubuntu${ubuntu_ver}/mellanox_mlnx_ofed.list"
    
    wget -qO - https://www.mellanox.com/downloads/ofed/RPM-GPG-KEY-Mellanox | \
        apt-key add -
    wget -q -O /etc/apt/sources.list.d/mellanox_mlnx_ofed.list \
         "$mlnx_url"
    apt update
    apt install mlnx-ofed-kernel-only -y
}

install_mellanox_ofed ${MELLANOX_OFED_VERSION}

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Hirsute)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Groovy)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1919392

Title:
  5.4.0-67.75 breaks compat with 3rd party Mellanox OFED drivers

Status in linux package in Ubuntu:
  New
Status in linux source package in Focal:
  New
Status in linux source package in Groovy:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  [Impact]
  Releases of Mellanox OFED drivers no longer compile against latest focal 
kernel. While Ubuntu can not necessarily guarantee source compatibility with 
3rd party trees, it seems like the MOFED stack has enough users that we'd want 
to avoid breaking it unnecessarily.

  [Fix]
  Temporarily reverting the following commits until MOFED can release a new 
version that supports them would do the trick:

  f21f647e08bd tools headers UAPI: Sync linux/const.h with the kernel headers
  37bbb8ed3e93 uapi: move constants from <linux/kernel.h> to <linux/const.h>

  [Test Case]
  Install MOFED driver stack:

  export DEBIAN_FRONTEND=noninteractive
  NVIDIA_DRIVER_VERSION=450-server
  MELLANOX_OFED_VERSION=5.1-2.5.8.0

  install_mellanox_ofed() {
      local MLNX_REPO="https://linux.mellanox.com/public/repo/mlnx_ofed";
      local mlnx_ofed_ver="$1"
      local ubuntu_ver
      ubuntu_ver="$(lsb_release -rs)"
      
mlnx_url="${MLNX_REPO}/${mlnx_ofed_ver}/ubuntu${ubuntu_ver}/mellanox_mlnx_ofed.list"
      
      wget -qO - https://www.mellanox.com/downloads/ofed/RPM-GPG-KEY-Mellanox | 
\
        apt-key add -
      wget -q -O /etc/apt/sources.list.d/mellanox_mlnx_ofed.list \
         "$mlnx_url"
      apt update
      apt install mlnx-ofed-kernel-only -y
  }

  install_mellanox_ofed ${MELLANOX_OFED_VERSION}

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