linux-kernel - Re: [PATCH 3/3] tools lib traceevent: Introduce pevent

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Date:	Sat, 16 Jun 2012 07:51:36 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 3/3] tools lib traceevent: Introduce pevent_strerror

Steven Rostedt <rostedt@...dmis.org> writes:
> On Sat, 2012-06-16 at 07:25 +0900, Namhyung Kim wrote:
>> Steven Rostedt <rostedt@...dmis.org> writes:
>> > Here's a little macro trick to keep the strings and enums always in
>> > sync:
>> >
>> > #define __PEVENT_ERRNO_CODES \
>> >  _C(PEVENT_ERRNO__MEM_ALLOC_FAILED,	"failed to allocate memory"),	\
>> >  _C(PEVENT_ERRNO__PARSE_EVENT_FAILED,	"failed to parse event"),	\
>> >  _C(PEVENT_ERRNO__READ_ID_FAILED,	"failed to read event id"),	\
>> >  _C(PEVENT_ERRNO__READ_FORMAT_FAILED,	"failed to read event format"),	\
>> >  _C(PEVENT_ERRNO__READ_PRINT_FAILED,	"failed to read event print fmt"),\
>> >  _C(PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED,"failed to allocate field name for ftrace"),
>> >
>> > #undef _C
>> > #define _C(a,b) b
>> > static const char * const pevent_error_str[] = { __PEVENT_ERROR_CODES };
>> >
>> 
>> Cool. Maybe even shorter:
>> 
>> #define __PEVENT_ERRNO_CODES \
>>  _C(MEM_ALLOC_FAILED,	"failed to allocate memory"),	\
>>  _C(PARSE_EVENT_FAILED,	"failed to parse event"),	\
>>  _C(READ_ID_FAILED,	"failed to read event id"),	\
>>  _C(READ_FORMAT_FAILED,	"failed to read event format"),	\
>>  _C(READ_PRINT_FAILED,	"failed to read event print fmt"), \
>>  _C(OLD_FTRACE_ARG_FAILED, "failed to allocate field name for ftrace"),
>> 
>> #undef _C
>> #define _C(a,b) PEVENT_ERRNO__ ## a
>
> I think you wanted b on this one. ;-)
>

Oops, right. :)


>> static const char * const pevent_error_str[] = { __PEVENT_ERROR_CODES };
>> 
>> But it make them less grep-able?
>
> Yeah, that is a problem, although we could perhaps teach ctags and etags
> how to find them.
>

Ok, then I'll go with yours.

Thanks,
Namhyung
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