linux-kernel - Re: [PATCH v2 11/16] perf parse-events: Improve error message for bad numbers

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Date: Fri, 26 Apr 2024 22:35:59 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	James Clark <james.clark@....com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	Atish Patra <atishp@...osinc.com>, linux-riscv@...ts.infradead.org,
	Beeman Strong <beeman@...osinc.com>
Subject: Re: [PATCH v2 11/16] perf parse-events: Improve error message for
 bad numbers

On Mon, Apr 15, 2024 at 11:15:27PM -0700, Ian Rogers wrote:
> Use the error handler from the parse_state to give a more informative
> error message.
> 
> Before:
> ```
> $ perf stat -e 'cycles/period=99999999999999999999/' true
> event syntax error: 'cycles/period=99999999999999999999/'
>                                   \___ parser error
> Run 'perf list' for a list of valid events
> 
>  Usage: perf stat [<options>] [<command>]
> 
>     -e, --event <event>   event selector. use 'perf list' to list available events
> ```
> 
> After:
> ```
> $ perf stat -e 'cycles/period=99999999999999999999/' true
> event syntax error: 'cycles/period=99999999999999999999/'
>                                   \___ parser error
> 

This ended up in perf-tools-next, will have to look at what this problem
is:

   9    11.46 amazonlinux:2                 : FAIL gcc version 7.3.1 20180712 (Red Hat 7.3.1-17) (GCC) 
     yy_size_t parse_events_get_leng (yyscan_t yyscanner );
               ^~~~~~~~~~~~~~~~~~~~~
    util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
     int parse_events_get_leng(yyscan_t yyscanner);
         ^~~~~~~~~~~~~~~~~~~~~
     yy_size_t parse_events_get_leng  (yyscan_t yyscanner)
               ^~~~~~~~~~~~~~~~~~~~~
    util/parse-events.l:22:5: note: previous declaration of 'parse_events_get_leng' was here
     int parse_events_get_leng(yyscan_t yyscanner);
         ^~~~~~~~~~~~~~~~~~~~~
    make[3]: *** [util] Error 2


Unsure if this will appear on the radar on other distros, maybe this is
just something that pops up with older distros...

Ran out of time today...

- Arnaldo