[Bug 1957126] Re: lscpu not showing number of sockets on arm64

[Andreas Hasenack]

I tried a few different arm64 hosts (aws VM, a bare metal in a Canonical MAAS cluster), and lscpu 
was behaving just fine there. But confirmed it with the pi4 using current util-linux:


util-linux     2.38.1-4ubuntu1

root at l1-lscpu:~# lscpu|grep Socket
Socket(s):                       -

root at l1-lscpu:~# cat /proc/cpuinfo 
processor	: 0
BogoMIPS	: 108.00
Features	: fp asimd evtstrm crc32 cpuid
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0xd08
CPU revision	: 3

processor	: 1
BogoMIPS	: 108.00
Features	: fp asimd evtstrm crc32 cpuid
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0xd08
CPU revision	: 3

processor	: 2
BogoMIPS	: 108.00
Features	: fp asimd evtstrm crc32 cpuid
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0xd08
CPU revision	: 3

processor	: 3
BogoMIPS	: 108.00
Features	: fp asimd evtstrm crc32 cpuid
CPU implementer	: 0x41
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0xd08
CPU revision	: 3

Hardware	: BCM2835
Revision	: c03112
Serial		: 10000000f40b82d7
Model		: Raspberry Pi 4 Model B Rev 1.2

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https://bugs.launchpad.net/bugs/1957126

Title:
  lscpu not showing number of sockets on arm64

Status in util-linux package in Ubuntu:
  New

Bug description:
  When running `lscpu` on arm64, the number of sockets is not populated.
  This is seen on both Raspberry Pi hardware and in the autopkgtest
  environment. Example output:

  Architecture:            aarch64
    CPU op-mode(s):        32-bit, 64-bit
    Byte Order:            Little Endian
  CPU(s):                  4
    On-line CPU(s) list:   0-3
  Vendor ID:               ARM
    Model name:            Cortex-A72
      Model:               3
      Thread(s) per core:  1
      Core(s) per cluster: 4
      Socket(s):           -
      Cluster(s):          1
      Stepping:            r0p3
      CPU max MHz:         1500.0000
      CPU min MHz:         600.0000
      BogoMIPS:            108.00
      Flags:               fp asimd evtstrm crc32 cpuid
  Vulnerabilities:
    Itlb multihit:         Not affected
    L1tf:                  Not affected
    Mds:                   Not affected
    Meltdown:              Not affected
    Spec store bypass:     Vulnerable
    Spectre v1:            Mitigation; __user pointer sanitization
    Spectre v2:            Vulnerable
    Srbds:                 Not affected
    Tsx async abort:       Not affected

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