linux-kernel - [PATCH v2 11/13] selftests/resctrl: Convert ctrlgrp & mongrp to pointers

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Date: Mon, 11 Mar 2024 15:52:28 +0200
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-kselftest@...r.kernel.org,
	Reinette Chatre <reinette.chatre@...el.com>,
	Shuah Khan <shuah@...nel.org>,
	Babu Moger <babu.moger@....com>,
	Maciej Wieczór-Retman <maciej.wieczor-retman@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>,
	linux-kernel@...r.kernel.org,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 11/13] selftests/resctrl: Convert ctrlgrp & mongrp to pointers

The struct resctrl_val_param has control and monitor groups as char
arrays but they are not supposed to be mutated within resctrl_val().

Convert the ctrlgrp and mongrp char array within resctrl_val_param to
plain const char pointers and adjust the strlen() based checks to
check NULL instead.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 tools/testing/selftests/resctrl/resctrl.h   | 4 ++--
 tools/testing/selftests/resctrl/resctrlfs.c | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 52769b075233..54e5bce4c698 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -89,8 +89,8 @@ struct resctrl_test {
  */
 struct resctrl_val_param {
 	char		*resctrl_val;
-	char		ctrlgrp[64];
-	char		mongrp[64];
+	const char	*ctrlgrp;
+	const char	*mongrp;
 	char		filename[64];
 	unsigned long	mask;
 	int		num_of_runs;
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 79cf1c593106..dbe0cc6d74fa 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -469,7 +469,7 @@ static int create_grp(const char *grp_name, char *grp, const char *parent_grp)
 	 * length of grp_name == 0, it means, user wants to use root con_mon
 	 * grp, so do nothing
 	 */
-	if (strlen(grp_name) == 0)
+	if (!grp_name)
 		return 0;
 
 	/* Check if requested grp exists or not */
@@ -541,7 +541,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, const char *ctrlgrp,
 	char tasks[1024];
 	int ret = 0;
 
-	if (strlen(ctrlgrp))
+	if (ctrlgrp)
 		sprintf(controlgroup, "%s/%s", RESCTRL_PATH, ctrlgrp);
 	else
 		sprintf(controlgroup, "%s", RESCTRL_PATH);
@@ -558,7 +558,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, const char *ctrlgrp,
 	/* Create mon grp and write pid into it for "mbm" and "cmt" test */
 	if (!strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)) ||
 	    !strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) {
-		if (strlen(mongrp)) {
+		if (mongrp) {
 			sprintf(monitorgroup_p, "%s/mon_groups", controlgroup);
 			sprintf(monitorgroup, "%s/%s", monitorgroup_p, mongrp);
 			ret = create_grp(mongrp, monitorgroup, monitorgroup_p);
@@ -612,7 +612,7 @@ int write_schemata(const char *ctrlgrp, char *schemata, int cpu_no,
 		goto out;
 	}
 
-	if (strlen(ctrlgrp) != 0)
+	if (ctrlgrp)
 		sprintf(controlgroup, "%s/%s/schemata", RESCTRL_PATH, ctrlgrp);
 	else
 		sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
-- 
2.39.2