You have been subscribed to a public bug: ---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: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=e4b79900222b8cccd4da4a7a89581f Thank you. ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-166086 severity-medium targetmilestone-inin1710 -- AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10 https://bugs.launchpad.net/bugs/1759312 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
