linux-kernel - [PATCH v1 2/4] perf script: Remove some large stack allocations

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Message-Id: <20230527034324.2597593-3-irogers@google.com>
Date:   Fri, 26 May 2023 20:43:20 -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>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/4] perf script: Remove some large stack allocations

Some char buffers are stack allocated but in total they come to
24kb. Avoid Wstack-usage warnings by moving the arrays to being
dynamically allocated.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-script.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 029d5a597233..3875c4b72db1 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -3299,14 +3299,21 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
 				  int unset __maybe_unused)
 {
 	struct dirent *script_dirent, *lang_dirent;
-	char scripts_path[MAXPATHLEN];
+	char *buf, *scripts_path, *script_path, *lang_path, *first_half;
 	DIR *scripts_dir, *lang_dir;
-	char script_path[MAXPATHLEN];
-	char lang_path[MAXPATHLEN];
 	struct script_desc *desc;
-	char first_half[BUFSIZ];
 	char *script_root;
 
+	buf = malloc(3 * MAXPATHLEN + BUFSIZ);
+	if (!buf) {
+		pr_err("malloc failed\n");
+		exit(-1);
+	}
+	scripts_path = buf;
+	script_path = buf + MAXPATHLEN;
+	lang_path = buf + 2 * MAXPATHLEN;
+	first_half = buf + 3 * MAXPATHLEN;
+
 	snprintf(scripts_path, MAXPATHLEN, "%s/scripts", get_argv_exec_path());
 
 	scripts_dir = opendir(scripts_path);
@@ -3315,6 +3322,7 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
 			"open(%s) failed.\n"
 			"Check \"PERF_EXEC_PATH\" env to set scripts dir.\n",
 			scripts_path);
+		free(buf);
 		exit(-1);
 	}
 
@@ -3345,6 +3353,7 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
 			desc->half_liner ? desc->half_liner : "");
 	}
 
+	free(buf);
 	exit(0);
 }
 
-- 
2.41.0.rc0.172.g3f132b7071-goog