linux-kernel - [PATCH -next 3/5] perf: Remove duplicate errbuf

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Date:   Mon, 26 Sep 2022 11:14:38 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <john.garry@...wei.com>, <adrian.hunter@...el.com>,
        <ak@...ux.intel.com>, <florian.fischer@...q.space>,
        <chenzhongjin@...wei.com>
Subject: [PATCH -next 3/5] perf: Remove duplicate errbuf

char errbuf[BUFSIZ] is defined twice in trace__run.

However out_error_open is not cross to other out_error path, they can
share one errbuf together.

Define the errbuf[BUFSIZ] at the beginning of function, and remove the
redefinations of them for code cleaning.

Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 tools/perf/builtin-trace.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 7ecd76428440..5660c0ee3507 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3937,6 +3937,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 	unsigned long before;
 	const bool forks = argc > 0;
 	bool draining = false;
+	char errbuf[BUFSIZ];
 
 	trace->live = true;
 
@@ -4027,8 +4028,6 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 
 	err = bpf__apply_obj_config();
 	if (err) {
-		char errbuf[BUFSIZ];
-
 		bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
 		pr_err("ERROR: Apply config to BPF failed: %s\n",
 			 errbuf);
@@ -4185,8 +4184,6 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 	trace->evlist = NULL;
 	trace->live = false;
 	return err;
-{
-	char errbuf[BUFSIZ];
 
 out_error_sched_stat_runtime:
 	tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
@@ -4213,7 +4210,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 		evsel->filter, evsel__name(evsel), errno,
 		str_error_r(errno, errbuf, sizeof(errbuf)));
 	goto out_delete_evlist;
-}
+
 out_error_mem:
 	fprintf(trace->output, "Not enough memory to run!\n");
 	goto out_delete_evlist;
-- 
2.17.1