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Not the first time! not the last time? There is a possibility to use gcc 5's -Wbool-compare to try and compare (reg) in those macros to a constant and gcc will warn that the comparison between a boolean expression and a constant is always either true or false. Maybe. Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Reviewed-by: Imre Deak <imre.deak@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com>