linux-kernel - [PATCH 2/3] selftests/resctrl: Simplify cleanup in ctrl-c handler

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Date: Tue, 20 Feb 2024 14:14:33 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Shuah Khan <shuah@...nel.org>
Cc: ilpo.jarvinen@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 2/3] selftests/resctrl: Simplify cleanup in ctrl-c handler

Ctrl-c handler isn't aware of what test is currently running. Because of
that it executes all cleanups even if they aren't necessary. Since the
ctrl-c handler uses the sigaction system no parameters can be passed
to it as function arguments.

Add a global variable to make ctrl-c handler aware of the currently run
test and only execute the correct cleanup callback.

Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
---
 tools/testing/selftests/resctrl/resctrl.h     |  2 ++
 .../testing/selftests/resctrl/resctrl_tests.c | 20 +++++++++----------
 tools/testing/selftests/resctrl/resctrl_val.c |  2 +-
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 0f49df4961ea..79b45cbeb628 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -128,6 +128,8 @@ extern pid_t bm_pid, ppid;
 
 extern char llc_occup_path[1024];
 
+extern struct resctrl_test current_test;
+
 int get_vendor(void);
 bool check_resctrlfs_support(void);
 int filter_dmesg(void);
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 75fc49ba3efb..b17f7401892c 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -14,6 +14,12 @@
 static volatile int sink_target;
 volatile int *value_sink = &sink_target;
 
+/*
+ * Set during test preparation for the cleanup function pointer used in
+ * ctrl-c sa_sigaction
+ */
+struct resctrl_test current_test;
+
 static struct resctrl_test *resctrl_tests[] = {
 	&mbm_test,
 	&mba_test,
@@ -75,18 +81,12 @@ static void cmd_help(void)
 	printf("\t-h: help\n");
 }
 
-void tests_cleanup(void)
-{
-	mbm_test_cleanup();
-	mba_test_cleanup();
-	cmt_test_cleanup();
-	cat_test_cleanup();
-}
-
-static int test_prepare(void)
+static int test_prepare(const struct resctrl_test *test)
 {
 	int res;
 
+	current_test = *test;
+
 	res = signal_handler_register();
 	if (res) {
 		ksft_print_msg("Failed to register signal handler\n");
@@ -130,7 +130,7 @@ static void run_single_test(const struct resctrl_test *test, const struct user_p
 
 	ksft_print_msg("Starting %s test ...\n", test->name);
 
-	if (test_prepare()) {
+	if (test_prepare(test)) {
 		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
 		return;
 	}
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 5a49f07a6c85..db6aac33ced1 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -472,7 +472,7 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
 	if (bm_pid)
 		kill(bm_pid, SIGKILL);
 	umount_resctrlfs();
-	tests_cleanup();
+	current_test.cleanup();
 	ksft_print_msg("Ending\n\n");
 
 	exit(EXIT_SUCCESS);
-- 
2.43.2