Raspberry Pi 3B plus cpuinfo

[Terrance]

[Impact]

Missing model name, hardware revision etc. from /proc/cpuinfo.

[Test Case]

'cat /proc/cpuinfo' should show something like:

Hardware : BCM2835
Revision : a02082
Serial : 00000000f13010a2

[Fix]

Backport commit 935eb6f9a319 ("arch/arm64: Add Revision, Serial, Model to cpuinfo") from raspberry/linux rpi-4.19.y.

[Regression Potential]

Low. Isolated and simple fix.

[Original Description]

# OS

```
$ uname -a
Linux host-name 4.15.0-1033-raspi2 #35-Ubuntu SMP PREEMPT Fri Mar 15 15:53:58 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic

```

# expected cpuinfo

with "model name", "Hardware", "Revision" etc.

some example from raspbian armhf

```
processor : 0
model name : ARMv7 Processor rev 4 (v7l)
BogoMIPS : 38.40
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
.
.
.
Hardware : BCM2835
Revision : a02082
Serial : 00000000f13010a2

```

# actual cpuinfo

This causes golang unable to detect platform.

```
$ cat /proc/cpuinfo
processor : 0
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 1
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 2
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 3
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
```

[Maximilian Haverkamp (haver007)]

Still affected on Ubuntu Mate 18.04.02 64-bit.
Any fix or workaround out their?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-raspi2 - 4.15.0-1053.57

---------------
linux-raspi2 (4.15.0-1053.57) bionic; urgency=medium

  * bionic/linux-raspi2: 4.15.0-1053.57 -proposed tracker (LP: #1854793)

  * Bionic update: upstream stable patchset 2019-11-21 (LP: #1853519)
    - raspi2: [Config] CONFIG_SGL_ALLOC=y

  * update ENA driver for DIMLIB dynamic interrupt moderation (LP: #1853180)
    - raspi2: [Config] disable CONFIG_DIMLIB

  * bcm2835-sdhost: Lots of Compile warnings (LP: #1847432)
    - mmc: bcm2835-sdhost: Fix warnings on arm64

  * Raspberry Pi 3B plus cpuinfo (LP: #1823151)
    - arch/arm64: Add Revision, Serial, Model to cpuinfo

  * Conflicting mmc modules built in (LP: #1762835)
    - [Config] raspi2: Remove upstream mmc modules

  [ Ubuntu: 4.15.0-73.82 ]

  * bionic/linux: 4.15.0-73.82 -proposed tracker (LP: #1854819)
  * CVE-2019-14901
    - SAUCE: mwifiex: Fix heap overflow in mmwifiex_process_tdls_action_frame()
  * CVE-2019-14896 // CVE-2019-14897
    - SAUCE: libertas: Fix two buffer overflows at parsing bss descriptor
  * CVE-2019-14895
    - SAUCE: mwifiex: fix possible heap overflow in mwifiex_process_country_ie()
  * CVE-2019-18660: patches for Ubuntu (LP: #1853142) // CVE-2019-18660
    - powerpc/64s: support nospectre_v2 cmdline option
    - powerpc/book3s64: Fix link stack flush on context switch
    - KVM: PPC: Book3S HV: Flush link stack on guest exit to host kernel
  * Please add patch fixing RK818 ID detection (LP: #1853192)
    - SAUCE: mfd: rk808: Fix RK818 ID template
  * [SRU][B/OEM-B/OEM-OSP1/D] Enable new Elan touchpads which are not in current
    whitelist (LP: #1853246)
    - HID: quirks: Fix keyboard + touchpad on Lenovo Miix 630
    - Input: elan_i2c - export the device id whitelist
    - HID: quirks: Refactor ELAN 400 and 401 handling
  * Lenovo dock MAC Address pass through doesn't work in Ubuntu (LP: #1827961)
    - r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2
  * s390/dasd: reduce the default queue depth and nr of hardware queues
    (LP: #1852257)
    - s390/dasd: reduce the default queue depth and nr of hardware queues
  * External microphone can't work on some dell machines with the codec alc256
    or alc236 (LP: #1853791)
    - SAUCE: ALSA: hda/realtek - Move some alc256 pintbls to fallback table
    - SAUCE: ALSA: hda/realtek - Move some alc236 pintbls to fallback table
  * Memory leak in net/xfrm/xfrm_state.c - 8 pages per ipsec connection
    (LP: #1853197)
    - xfrm: Fix memleak on xfrm state destroy
  * CVE-2019-19083
    - drm/amd/display: memory leak
  * update ENA driver for DIMLIB dynamic interrupt moderation (LP: #1853180)
    - net: ena: add intr_moder_rx_interval to struct ena_com_dev and use it
    - net: ena: switch to dim algorithm for rx adaptive interrupt moderation
    - net: ena: reimplement set/get_coalesce()
    - net: ena: enable the interrupt_moderation in driver_supported_features
    - net: ena: remove code duplication in
      ena_com_update_nonadaptive_moderation_interval _*()
    - net: ena: remove old adaptive interrupt moderation code from ena_netdev
    - net: ena: remove ena_restore_ethtool_params() and relevant fields
    ...