[Bug 2019856] Re: Add missing ARM-cores to support Grace-based systems

[Mauricio Faria de Oliveira]

The autopkgtests failures in lunar seem to be a kernel issue during the
initialization of the virtio rng driver, when the mutex for
(generic/core) hw rng is acquired (apparently something else is holding
it indefinitely, thus the blocked task warnings show up, and it seems
the VM doesn't proceed to the point of being detected, and the test
fails/times out).

I haven't seen related commits listed in the later linux package
changelogs for lunar (this is with 6.2.0-25-generic), nor could
reproduce this in a LXD VM with the same version (it uses a virtio rng
device too).

Let's try again when another openstack image for lunar is available
(current/failing is 2023-07-17).

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https://bugs.launchpad.net/bugs/2019856

Title:
  Add missing ARM-cores to support Grace-based systems

Status in util-linux package in Ubuntu:
  Fix Released
Status in util-linux source package in Jammy:
  Fix Committed
Status in util-linux source package in Kinetic:
  Won't Fix
Status in util-linux source package in Lunar:
  Fix Committed
Status in util-linux source package in Mantic:
  Fix Released

Bug description:
  [Impact]

  When running "lscpu" on a Grace-based system + Ubuntu 22.04, it
  doesn't report a model name:

  Vendor ID: ARM
  Model: 0

  [Fix]

  Adding the additional arm_part to sys-utils/lscpu-arm.c solves the
  problem. The commit below adds the specific codes missing from Jammy's
  version.

  https://github.com/util-linux/util-
  linux/commit/6857cccbb4157d5da34ca98f77a0ac9d68e1e740

  [Test Steps]

  * Verify whether output of lscpu is correct on new CPUs; eg:
  Vendor ID: ARM
  Model name: Neoverse-V2

  * Verify whether output of lscpu doesn't change on old CPUs; eg:
  Vendor ID: ARM
  Model name: Neoverse-N1

  [What Could Go Wrong]

  The fix only introduces additional model identifiers to match
  against and print a model name string, thus regression impact
  should be contained within lscpu and printing cpus model name
  on ARM systems. 

  Output doesn't change on systems with non-affected CPU models.

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