linux-kernel - [PATCH v1 08/16] perf daemon: Dynamically allocate path to perf

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Message-Id: <20230525071133.2066610-9-irogers@google.com>
Date:   Thu, 25 May 2023 00:11:25 -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>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Ross Zwisler <zwisler@...omium.org>,
        Leo Yan <leo.yan@...aro.org>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Yang Jihong <yangjihong1@...wei.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v1 08/16] perf daemon: Dynamically allocate path to perf

Avoid a PATH_MAX array in __daemon (the .data section) by dynamically
allocating the memory.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-daemon.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index 34cbe3e959aa..adb5751c3ed0 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -90,7 +90,7 @@ struct daemon {
 	char			*base;
 	struct list_head	 sessions;
 	FILE			*out;
-	char			 perf[PATH_MAX];
+	char			*perf;
 	int			 signal_fd;
 	time_t			 start;
 };
@@ -1490,6 +1490,15 @@ static int __cmd_ping(struct daemon *daemon, struct option parent_options[],
 	return send_cmd(daemon, &cmd);
 }
 
+static char *set_perf_exe(void)
+{
+	char path[PATH_MAX];
+
+	perf_exe(path, sizeof(path));
+	__daemon.perf = strdup(path);
+	return __daemon.perf;
+}
+
 int cmd_daemon(int argc, const char **argv)
 {
 	struct option daemon_options[] = {
@@ -1503,7 +1512,9 @@ int cmd_daemon(int argc, const char **argv)
 		OPT_END()
 	};
 
-	perf_exe(__daemon.perf, sizeof(__daemon.perf));
+	if (!set_perf_exe())
+		return -ENOMEM;
+
 	__daemon.out = stdout;
 
 	argc = parse_options(argc, argv, daemon_options, daemon_usage,
-- 
2.40.1.698.g37aff9b760-goog