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Add a parallel test for the SPMC Lev-Chase workstealing queue. The queue is built to be wait-free even when there are multiple consumers, and the parallel selftest provides a signal on whether the queue behaves correctly when stress tested. To support the test, this patch includes a test harness for parallel selftests. The spmc selftest acts as an example of the naming and other conventions expected by the harness. Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com> Link: https://lore.kernel.org/r/20260605222020.5231-4-emil@etsalapatis.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>