linux-kernel - [PATCH 7/7] selftests/resctrl: Cleanup benchmark argument parsing

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Date:   Tue,  8 Aug 2023 12:16:25 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-kernel@...r.kernel.org
Cc:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 7/7] selftests/resctrl: Cleanup benchmark argument parsing

Benchmark argument is handled by custom argument parsing code which is
more complicated than it needs to be.

Process benchmark argument within the normal getopt() handling and drop
entirely unnecessary ben_ind and has_ben variables. If -b is not given,
setup the default benchmark command right after the switch statement
and make -b to goto over it while it terminates the getopt() loop.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 .../testing/selftests/resctrl/resctrl_tests.c | 56 +++++++++----------
 1 file changed, 25 insertions(+), 31 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 81c2ed299e6f..a437aaa69cc5 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -173,25 +173,27 @@ static void run_cat_test(int cpu_no, int no_of_bits)
 
 int main(int argc, char **argv)
 {
-	bool has_ben = false, mbm_test = true, mba_test = true, cmt_test = true;
-	int c, cpu_no = 1, argc_new = argc, i, no_of_bits = 0;
+	bool mbm_test = true, mba_test = true, cmt_test = true;
+	int c, cpu_no = 1, i, no_of_bits = 0;
 	const char *benchmark_cmd[BENCHMARK_ARGS];
-	int ben_ind, tests = 0;
 	bool cat_test = true;
+	int tests = 0;
 
-	for (i = 0; i < argc; i++) {
-		if (strcmp(argv[i], "-b") == 0) {
-			ben_ind = i + 1;
-			argc_new = ben_ind - 1;
-			has_ben = true;
-			break;
-		}
-	}
-
-	while ((c = getopt(argc_new, argv, "ht:b:n:p:")) != -1) {
+	while ((c = getopt(argc, argv, "ht:b:n:p:")) != -1) {
 		char *token;
 
 		switch (c) {
+		case 'b':
+			optind--;			/* Back to optarg */
+			if (argc - optind >= BENCHMARK_ARGS - 1)
+				ksft_exit_fail_msg("Too long benchmark command");
+
+			/* Extract benchmark command from command line. */
+			for (i = 0; i < argc - optind; i++)
+				benchmark_cmd[i] = argv[i + optind];
+			benchmark_cmd[i] = NULL;
+
+			goto last_arg;
 		case 't':
 			token = strtok(optarg, ",");
 
@@ -241,6 +243,16 @@ int main(int argc, char **argv)
 		}
 	}
 
+	/* If no benchmark is given by "-b" argument, use fill_buf. */
+	benchmark_cmd[0] = "fill_buf";
+	benchmark_cmd[1] = DEFAULT_SPAN_STR;
+	benchmark_cmd[2] = "1";
+	benchmark_cmd[3] = "0";
+	benchmark_cmd[4] = "false";
+	benchmark_cmd[5] = NULL;
+
+last_arg:
+
 	ksft_print_header();
 
 	/*
@@ -251,24 +263,6 @@ int main(int argc, char **argv)
 	if (geteuid() != 0)
 		return ksft_exit_skip("Not running as root. Skipping...\n");
 
-	if (has_ben) {
-		if (argc - ben_ind >= BENCHMARK_ARGS - 1)
-			ksft_exit_fail_msg("Too long benchmark command");
-
-		/* Extract benchmark command from command line. */
-		for (i = 0; i < argc - ben_ind; i++)
-			benchmark_cmd[i] = argv[i + ben_ind];
-		benchmark_cmd[i] = NULL;
-	} else {
-		/* If no benchmark is given by "-b" argument, use fill_buf. */
-		benchmark_cmd[0] = "fill_buf";
-		benchmark_cmd[1] = DEFAULT_SPAN_STR;
-		benchmark_cmd[2] = "1";
-		benchmark_cmd[3] = "0";
-		benchmark_cmd[4] = "false";
-		benchmark_cmd[5] = NULL;
-	}
-
 	if (!check_resctrlfs_support())
 		return ksft_exit_skip("resctrl FS does not exist. Enable X86_CPU_RESCTRL config option.\n");
 
-- 
2.30.2