linux-kernel - [PATCH 1/4] selftests/resctrl: Change initialize_llc

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Date:   Wed,  8 Feb 2023 11:40:23 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/4] selftests/resctrl: Change initialize_llc_perf() return type to void

initialize_llc_perf() unconditionally does return 0 so no point in
having it's return type as int. Hence, change it's return type from int
to void.

Co-developed-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 tools/testing/selftests/resctrl/cache.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 68ff856d36f0..4b8ee81aedae 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -48,7 +48,7 @@ static int perf_event_open_llc_miss(pid_t pid, int cpu_no)
 	return 0;
 }
 
-static int initialize_llc_perf(void)
+static void initialize_llc_perf(void)
 {
 	memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr));
 	memset(&rf_cqm, 0, sizeof(struct read_format));
@@ -59,8 +59,6 @@ static int initialize_llc_perf(void)
 	pea_llc_miss.config = PERF_COUNT_HW_CACHE_MISSES;
 
 	rf_cqm.nr = 1;
-
-	return 0;
 }
 
 static int reset_enable_llc_perf(pid_t pid, int cpu_no)
@@ -234,11 +232,8 @@ int cat_val(struct resctrl_val_param *param)
 	if (ret)
 		return ret;
 
-	if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) {
-		ret = initialize_llc_perf();
-		if (ret)
-			return ret;
-	}
+	if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)))
+		initialize_llc_perf();
 
 	/* Test runs until the callback setup() tells the test to stop. */
 	while (1) {
-- 
2.30.2