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Add KUnit tests covering the reactor register/unregister lifecycle
(including duplicate and name-length rejection) and rv_react() dispatch
(a no-op without a callback, exactly one invocation with one). The
mdelay() callback keeps the CPU busy so a timer interrupt lands inside
rv_react()'s lockdep context, exercising the LD_WAIT_SPIN wait type
from the previous patch; a spurious lockdep splat there would show up
in the test output.
The dispatch tests rely on reacting_on being enabled, since rv_react()
returns early when it is off.
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Wen Yang <wen.yang@linux.dev>
Link: https://lore.kernel.org/r/7d213b110815da45595ad8cd7bcce5641fac3404.1789412799.git.wen.yang@linux.dev
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
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