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

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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 <dmaluka@chromium.org>
Link: https://lore.kernel.org/r/20260319153825.2813576-1-dmaluka@chromium.org
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Dmytro Maluka
2026-03-19 16:38:12 +01:00
committed by Shuah Khan
parent 64fac99037
commit 9d2dbd3d59
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh
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@@ -24,7 +24,7 @@ prerequisite()
exit $ksft_skip
fi
if ! ls $SYSFS/devices/system/cpu/cpu* > /dev/null 2>&1; then
if ! ls $SYSFS/devices/system/cpu/cpu*/online > /dev/null 2>&1; then
echo $msg cpu hotplug is not supported >&2
exit $ksft_skip
fi