hi all So Im (always) hacking on dynamic-debug.. Ive added a 'T' flag, which causes dyndbg to send its message to /sys/kernel/tracing/trace instead of syslog (p does that). trouble is, pr_debug() calls almost always have a trailing newline, and ftrace adds its own, so the tracefile has empty lines after each pr_debug's message. I would like to fix this in the format-string, with a macro, and add the newline explicitly, when given originally, for the 'p'/syslog case. While still needing an add-newline? decision, it avoids scanning format or sprint-d bufs for the trailing newline. ie #define strip_trailing_newline(str) ..... #define has_trailing_newline(str) ... theyd get used in: #define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \ ... .format = strip_trailing_newline(fmt), \ .add_nl = has_trailing_newline(fmt), \ that new .add_nl bit-field might be difficult - the other flags in _ddebug are not individual bit-fields, but I think this would have to be separate to be initializable in the macro. maybe no big deal. and how to fix the 'fmt expanded 2x' problem ?