cpuhotplug.py fails on x86_64 due to incorrect access to cpu0/online (non-hotpluggable CPU)

[kumarmuthu]

• cpuhotplug.py fails on x86_64 architecture

Base Exception:
avocado.core.exceptions.TestCancel: Processor is not powerpc

• This exception is expected and correctly raised because the system is not a PowerPC (ppc) architecture.

Additional Error:
[Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu0/online'

• This occurred because the script starts iterating CPU indices from cpu0
(see: Line 301 in cpuhotplug.py).

On AMD (x86_64) systems, cpu0 is not hotpluggable and does not have an online file, unlike higher-numbered CPUs (cpu1, cpu2, etc.). Accessing cpu0/online therefore leads to a FileNotFoundError.

Suggestion:

• There is already an architecture check in setUp():

if 'ppc' not in distro.detect().arch:
    self.cancel("Processor is not powerpc")

• To prevent similar errors during cleanup, we recommend applying the same condition inside tearDown() as well:
Relevant section in tearDown

if 'ppc' not in distro.detect().arch:
    return

Execution Log:

Running avocado run: /root/avocado-misc-tests/cpu/cpuhotplug.py
/root/.local/share/pipx/venvs/avocado-framework/lib/python3.12/site-packages/avocado/core/__init__.py:18: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
  import pkg_resources
JOB ID     : 973e308f67951dae13f409a019a37dd3f2b222d8
JOB LOG    : /root/avocado/job-results/job-2025-06-29T13.51-973e308/job.log
 (1/1) /root/avocado-misc-tests/cpu/cpuhotplug.py:cpuHotplug.test: STARTED
 (1/1) /root/avocado-misc-tests/cpu/cpuhotplug.py:cpuHotplug.test:  ERROR: [Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu0/online' (0.06 s)
RESULTS    : PASS 0 | ERROR 1 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB HTML   : /root/avocado/job-results/job-2025-06-29T13.51-973e308/results.html
JOB TIME   : 1.54 s

Test summary:
1-/root/avocado-misc-tests/cpu/cpuhotplug.py:cpuHotplug.test: ERROR

/root/avocado-misc-tests/cpu/cpuhotplug.py : RESULTS    : PASS 0 | ERROR 1 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0