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Add test_csd_lock, a module that keeps one CPU from answering an IPI for
as long as its stall_ms parameter says, so that the CSD-lock debug code
has a stall to report. With in_handler=1 the CPU stalls inside a CSD
handler instead, which is the case where the IPI is not re-sent.
The module needs CONFIG_CSD_LOCK_WAIT_DEBUG and csdlock_debug=1. Loading
it runs one stall and then fails the load with -EAGAIN, the way
test_lockup does, so that nothing is left loaded afterwards.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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