linux-kernel - [PATCH v1 2/4] perf parse-events: Avoid use uninitialized warning

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Message-Id: <20230724201247.748146-3-irogers@google.com>
Date:   Mon, 24 Jul 2023 13:12:45 -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>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Carsten Haitzler <carsten.haitzler@....com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Cc:     maskray@...gle.com
Subject: [PATCH v1 2/4] perf parse-events: Avoid use uninitialized warning

With GCC LTO a potential use uninitialized is spotted:
```
In function ‘parse_events_config_bpf’,
    inlined from ‘parse_events_load_bpf’ at util/parse-events.c:874:8:
util/parse-events.c:792:37: error: ‘error_pos’ may be used uninitialized [-Werror=maybe-uninitialized]
  792 |                                 idx = term->err_term + error_pos;
      |                                     ^
util/parse-events.c: In function ‘parse_events_load_bpf’:
util/parse-events.c:765:13: note: ‘error_pos’ was declared here
  765 |         int error_pos;
      |             ^
```
So initialize at declaration.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/parse-events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index acde097e327c..da29061ecf49 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -762,7 +762,7 @@ parse_events_config_bpf(struct parse_events_state *parse_state,
 			struct list_head *head_config)
 {
 	struct parse_events_term *term;
-	int error_pos;
+	int error_pos = 0;
 
 	if (!head_config || list_empty(head_config))
 		return 0;
-- 
2.41.0.487.g6d72f3e995-goog