I built a test kernel with commit e4b79900222b8cccd4da4a7a89581f from 
linux-next.  The test kernel can be downloaded from:

Can you test this kernel and see if it resolves this bug?

Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.

Thanks in advance!

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  AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  ---Problem Description---
  AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10
  ---Additional Hardware Info---
  Architecture:        ppc64le
  Byte Order:          Little Endian
  CPU(s):              176
  On-line CPU(s) list: 0-175
  Thread(s) per core:  4
  Core(s) per socket:  22
  Socket(s):           2
  NUMA node(s):        8
  Model:               2.2 (pvr 004e 1202)
  Model name:          POWER9, altivec supported
  CPU max MHz:         2800.0000
  CPU min MHz:         2300.0000
  L1d cache:           32K
  L1i cache:           32K
  L2 cache:            512K
  L3 cache:            10240K
  NUMA node0 CPU(s):   0-87
  NUMA node8 CPU(s):   88-175
  NUMA node250 CPU(s): 
  NUMA node251 CPU(s): 
  NUMA node252 CPU(s): 
  NUMA node253 CPU(s): 
  NUMA node254 CPU(s): 
  NUMA node255 CPU(s): 
  Machine Type = P9, DD2.2, Witherspoon, baremetal 
  ---Steps to Reproduce---
   AT_BASE_PLATFORM in AIXV is not exported to userspace on P9 baremetal 
machines causing trouble to userspace tools and software that relie on that 
information, notably operf and opreport (from oprofile 1.2.0+) will refuse to 
run without that information show a error message like:

  gromero@ltc-wspoon3:/boot$ operf
  NULL returned for one or both of AT_PLATFORM/AT_BASE_PLATFORM
  AT_PLATFORM: power9;  AT_BASE_PLATFORM: (null)
  Unable to obtain cpu_type
  Verify that a pre-1.0 version of OProfile is not in use.
  If the /dev/oprofile/cpu_type file exists, locate the pre-1.0 OProfile
  installation, and use its 'opcontrol' command, passing the --deinit option.
  Unable to ascertain cpu type.  Exiting.
  ---uname output---
  linux-image-4.13.0-36-generic          4.13.0-36.40
  Userspace tool common name: operf, opreport 

  Dear maintainer. please consider applying the following fix that's
  already available upstream:


  Thank you.

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