kernel/linux.git/tools/testing/selftests/cpu-hotplug, branch master

selftests/cpu-hotplug: Fix check for cpu hotplug not supported

2026-03-31T22:07:19+00:00

If CONFIG_HOTPLUG_CPU is disabled, /sys/devices/system/cpu/cpu* directories are still populated, so the test fails to correctly detect that CPU hotplug is not supported. Fix this by checking for the presence of 'online' files in those directories instead. The 'online' node is created for the given CPU if and only if this CPU supports hotplug. So if none of the CPUs have 'online' nodes, it means CPU hotplug is not supported. Signed-off-by: Dmytro Maluka Link: https://lore.kernel.org/r/20260319153825.2813576-1-dmaluka@chromium.org Signed-off-by: Shuah Khan

selftests/cpu-hotplug: fix typo in hotplaggable_offline_cpus function name

2025-06-17T20:12:16+00:00

Fix spelling error replacing "hotplaggable" by "hotpluggable" Fixed change log: Shuah Khan Link: https://lore.kernel.org/r/20250523202239.276760-1-jihed.chaibi.dev@gmail.com Signed-off-by: Jihed Chaibi Signed-off-by: Shuah Khan

selftests/cpu-hotplug: Add log info when test success

2022-10-05T17:05:18+00:00

Add log information when run full test successfully. Signed-off-by: Zhao Gongyi Signed-off-by: Shuah Khan

selftests/cpu-hotplug: Reserve one cpu online at least

2022-10-05T17:05:18+00:00

Considering that we can not offline all cpus in any cases, we need to reserve one cpu online when the test offline all hotpluggable online cpus, otherwise the test will fail forever. Fixes: d89dffa976bc ("fault-injection: add selftests for cpu and memory hotplug") Signed-off-by: Zhao Gongyi Signed-off-by: Shuah Khan

selftests/cpu-hotplug: Delete fault injection related code

2022-10-05T17:05:18+00:00

Delete fault injection related code since the module has been deleted. Signed-off-by: Zhao Gongyi Signed-off-by: Shuah Khan

selftests/cpu-hotplug: Use return instead of exit

2022-10-05T17:05:18+00:00

Some cpus will be left in offline state when online function exits in some error conditions. Use return instead of exit to fix it. Signed-off-by: Zhao Gongyi Signed-off-by: Shuah Khan

selftests/cpu-hotplug: Correct log info

2022-10-05T17:05:18+00:00

Correct the log info to match the test. Signed-off-by: Zhao Gongyi Signed-off-by: Shuah Khan

selftests: cpu-hotplug: fix case where CPUs offline > CPUs present

2019-01-25T21:57:45+00:00

The cpu-hotplug test assumes that we can offline the maximum CPU as described by /sys/devices/system/cpu/offline. However, in the case where the number of CPUs exceeds like kernel configuration then the offline count can be greater than the present count and we end up trying to test the offlining of a CPU that is not available to offline. Fix this by testing the maximum present CPU instead. Also, the test currently offlines the CPU and does not online it, so fix this by onlining the CPU after the test. Fixes: d89dffa976bc ("fault-injection: add selftests for cpu and memory hotplug") Signed-off-by: Colin Ian King Signed-off-by: Shuah Khan

selftests: cpu-hotplug: return Kselftest Skip code for skipped tests

2018-05-30T21:21:52+00:00

When cpu-on-off-test is skipped because of unmet dependencies and/or unsupported configuration, it returns 0 which is treated as a pass by the Kselftest framework. This leads to false positive result even when the test could not be run. Change it to return kselftest skip code when a test gets skipped to clearly report that the test could not be run. Kselftest framework SKIP code is 4 and the framework prints appropriate messages to indicate that the test is skipped. Signed-off-by: Shuah Khan (Samsung OSG)

selftests: remove obsolete kconfig fragment for cpu-hotplug

2017-11-15T15:01:43+00:00

Kconfig CONFIG_CPU_NOTIFIER_ERROR_INJECT has been removed since kernel 4.10 check commit: commit 530e9b76ae8f863dfdef4a6ad0b38613d32e8c3f Author: Thomas Gleixner Date: Wed Dec 21 20:19:53 2016 +0100 cpu/hotplug: Remove obsolete cpu hotplug register/unregister functions hotcpu_notifier(), cpu_notifier(), __hotcpu_notifier(), __cpu_notifier(), register_hotcpu_notifier(), register_cpu_notifier(), __register_hotcpu_notifier(), __register_cpu_notifier(), unregister_hotcpu_notifier(), unregister_cpu_notifier(), __unregister_hotcpu_notifier(), __unregister_cpu_notifier() Signed-off-by: Lei Yang Signed-off-by: Shuah Khan