linux-kernel - [PATCH v1 5/5] perf jevents.py: Ensure event names aren't duplicated

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Message-Id: <20240805194424.597244-5-irogers@google.com>
Date: Mon,  5 Aug 2024 12:44:24 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, James Clark <james.clark@...aro.org>, 
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Samuel Holland <samuel.holland@...ive.com>, 
	Charles Ci-Jyun Wu <dminus@...estech.com>, Locus Wei-Han Chen <locus84@...estech.com>, 
	Atish Patra <atishp@...osinc.com>, Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>, 
	Inochi Amaoto <inochiama@...look.com>, Jing Zhang <renyu.zj@...ux.alibaba.com>, 
	Xu Yang <xu.yang_2@....com>, Sandipan Das <sandipan.das@....com>, 
	Guilherme Amadio <amadio@...too.org>, Changbin Du <changbin.du@...wei.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-riscv@...ts.infradead.org, 
	vincent.chen@...ive.com, greentime.hu@...ive.com, 
	Eric Lin <eric.lin@...ive.com>
Subject: [PATCH v1 5/5] perf jevents.py: Ensure event names aren't duplicated

Duplicate event names break invariants in perf list. Assert that an
event name isn't duplicated so that broken json won't build.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/pmu-events/jevents.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index fcf0158438b5..1d96b2204e52 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -503,8 +503,11 @@ def print_pending_events() -> None:
 
   first = True
   last_pmu = None
+  last_name = None
   pmus = set()
   for event in sorted(_pending_events, key=event_cmp_key):
+    if last_pmu and last_pmu == event.pmu:
+      assert event.name != last_name, f"Duplicate event: {last_pmu}/{last_name}/ in {_pending_events_tblname}"
     if event.pmu != last_pmu:
       if not first:
         _args.output_file.write('};\n')
@@ -516,6 +519,7 @@ def print_pending_events() -> None:
       pmus.add((event.pmu, pmu_name))
 
     _args.output_file.write(event.to_c_string(metric=False))
+    last_name = event.name
   _pending_events = []
 
   _args.output_file.write(f"""
-- 
2.46.0.rc2.264.g509ed76dc8-goog