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Returning (exiting with) negative exit codes isn't user friendly, because the user must output the exit code with the shell, convert it from its unsigned 8-bit value back to the negative value, and then look up where that comes from in the code (which may be multiple places). Use the kselftests TAP interface, instead. Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20230918131518.56803-13-ajones@ventanamicro.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>