[tip:perf/urgent] perf pmu: Fix pmu events parsing rule

[tip-bot for Jiri Olsa]

Commit-ID:  9a4a931ce847f4aaa12edf11b2e050e18bf45910
Gitweb:     https://git.kernel.org/tip/9a4a931ce847f4aaa12edf11b2e050e18bf45910
Author:     Jiri Olsa <jo...@kernel.org>
AuthorDate: Mon, 23 Apr 2018 11:08:18 +0200
Committer:  Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Mon, 23 Apr 2018 11:17:27 -0300

perf pmu: Fix pmu events parsing rule

Currently all the event parsing fails end up in the event_pmu rule, and
display misleading help like:

  $ perf stat -e inst kill
  event syntax error: 'inst'
                       \___ Cannot find PMU `inst'. Missing kernel support?
  ...

The reason is that the event_pmu is too strong and match also single
string. Changing it to force the '/' separators to be part of the rule,
and getting the proper error now:

  $ perf stat -e inst kill
  event syntax error: 'inst'
                       \___ parser error
  Run 'perf list' for a list of valid events
  ...

Signed-off-by: Jiri Olsa <jo...@kernel.org>
Reported-by: Ingo Molnar <mi...@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Link: http://lkml.kernel.org/r/20180423090823.32309-5-jo...@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/util/parse-events.y | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 7afeb80cc39e..d14464c42714 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -224,15 +224,15 @@ event_def: event_pmu |
           event_bpf_file
 
 event_pmu:
-PE_NAME opt_event_config
+PE_NAME '/' event_config '/'
 {
        struct list_head *list, *orig_terms, *terms;
 
-       if (parse_events_copy_term_list($2, &orig_terms))
+       if (parse_events_copy_term_list($3, &orig_terms))
                YYABORT;
 
        ALLOC_LIST(list);
-       if (parse_events_add_pmu(_parse_state, list, $1, $2, false)) {
+       if (parse_events_add_pmu(_parse_state, list, $1, $3, false)) {
                struct perf_pmu *pmu = NULL;
                int ok = 0;
                char *pattern;
@@ -262,7 +262,7 @@ PE_NAME opt_event_config
                if (!ok)
                        YYABORT;
        }
-       parse_events_terms__delete($2);
+       parse_events_terms__delete($3);
        parse_events_terms__delete(orig_terms);
        $$ = list;
 }