Merge tag 'linux_kselftest-kunit-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kunit updates from Shuah Khan:

 - fix struct completion warning

 - introduce autorun option

 - add fallback for os.sched_getaffinity

 - enable hardware acceleration when available

* tag 'linux_kselftest-kunit-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  kunit: Introduce autorun option
  kunit: enable hardware acceleration when available
  kunit: add fallback for os.sched_getaffinity
  kunit: platform: Resolve 'struct completion' warning

Author: torvalds

include/kunit/platform_device.h

@@ -2,6 +2,7 @@
 #ifndef _KUNIT_PLATFORM_DRIVER_H
 #define _KUNIT_PLATFORM_DRIVER_H
 
+struct completion;
 struct kunit;
 struct platform_device;
 struct platform_driver;

include/kunit/test.h

@@ -312,6 +312,7 @@ static inline void kunit_set_failure(struct kunit *test)
 }
 
 bool kunit_enabled(void);
+bool kunit_autorun(void);
 const char *kunit_action(void);
 const char *kunit_filter_glob(void);
 char *kunit_filter(void);
@@ -334,7 +335,8 @@ kunit_filter_suites(const struct kunit_suite_set *suite_set,
 		    int *err);
 void kunit_free_suite_set(struct kunit_suite_set suite_set);
 
-int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites);
+int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites,
+			     bool run_tests);
 
 void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites);
 

lib/kunit/Kconfig

@@ -81,4 +81,16 @@ config KUNIT_DEFAULT_ENABLED
 	  In most cases this should be left as Y. Only if additional opt-in
 	  behavior is needed should this be set to N.
 
+config KUNIT_AUTORUN_ENABLED
+	bool "Default value of kunit.autorun"
+	default y
+	help
+	  Sets the default value of kunit.autorun. If set to N then KUnit
+	  tests will not run after initialization unless kunit.autorun=1 is
+	  passed to the kernel command line. The test can still be run manually
+	  via debugfs interface.
+
+	  In most cases this should be left as Y. Only if additional opt-in
+	  behavior is needed should this be set to N.
+
 endif # KUNIT

lib/kunit/debugfs.c

@@ -145,7 +145,7 @@ static ssize_t debugfs_run(struct file *file,
 	struct inode *f_inode = file->f_inode;
 	struct kunit_suite *suite = (struct kunit_suite *) f_inode->i_private;
 
-	__kunit_test_suites_init(&suite, 1);
+	__kunit_test_suites_init(&suite, 1, true);
 
 	return count;
 }

lib/kunit/executor.c

@@ -29,6 +29,22 @@ const char *kunit_action(void)
 	return action_param;
 }
 
+/*
+ * Run KUnit tests after initialization
+ */
+#ifdef CONFIG_KUNIT_AUTORUN_ENABLED
+static bool autorun_param = true;
+#else
+static bool autorun_param;
+#endif
+module_param_named(autorun, autorun_param, bool, 0);
+MODULE_PARM_DESC(autorun, "Run KUnit tests after initialization");
+
+bool kunit_autorun(void)
+{
+	return autorun_param;
+}
+
 static char *filter_glob_param;
 static char *filter_param;
 static char *filter_action_param;
@@ -260,13 +276,14 @@ kunit_filter_suites(const struct kunit_suite_set *suite_set,
 void kunit_exec_run_tests(struct kunit_suite_set *suite_set, bool builtin)
 {
 	size_t num_suites = suite_set->end - suite_set->start;
+	bool autorun = kunit_autorun();
 
-	if (builtin || num_suites) {
+	if (autorun && (builtin || num_suites)) {
 		pr_info("KTAP version 1\n");
 		pr_info("1..%zu\n", num_suites);
 	}
 
-	__kunit_test_suites_init(suite_set->start, num_suites);
+	__kunit_test_suites_init(suite_set->start, num_suites, autorun);
 }
 
 void kunit_exec_list_tests(struct kunit_suite_set *suite_set, bool include_attr)

lib/kunit/test.c

@@ -708,7 +708,8 @@ bool kunit_enabled(void)
 	return enable_param;
 }
 
-int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites)
+int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_suites,
+			     bool run_tests)
 {
 	unsigned int i;
 
@@ -731,7 +732,8 @@ int __kunit_test_suites_init(struct kunit_suite * const * const suites, int num_
 
 	for (i = 0; i < num_suites; i++) {
 		kunit_init_suite(suites[i]);
-		kunit_run_tests(suites[i]);
+		if (run_tests)
+			kunit_run_tests(suites[i]);
 	}
 
 	static_branch_dec(&kunit_running);

tools/testing/kunit/kunit.py

@@ -312,7 +312,16 @@ def massage_arg(arg: str) -> str:
 	return list(map(massage_arg, argv))
 
 def get_default_jobs() -> int:
-	return len(os.sched_getaffinity(0))
+	if sys.version_info >= (3, 13):
+		if (ncpu := os.process_cpu_count()) is not None:
+			return ncpu
+		raise RuntimeError("os.process_cpu_count() returned None")
+	 # See https://github.com/python/cpython/blob/b61fece/Lib/os.py#L1175-L1186.
+	if sys.platform != "darwin":
+		return len(os.sched_getaffinity(0))
+	if (ncpu := os.cpu_count()) is not None:
+		return ncpu
+	raise RuntimeError("os.cpu_count() returned None")
 
 def add_common_opts(parser: argparse.ArgumentParser) -> None:
 	parser.add_argument('--build_dir',

tools/testing/kunit/kunit_kernel.py

@@ -125,6 +125,9 @@ def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
 				'-append', ' '.join(params + [self._kernel_command_line]),
 				'-no-reboot',
 				'-nographic',
+				'-accel', 'kvm',
+				'-accel', 'hvf',
+				'-accel', 'tcg',
 				'-serial', self._serial] + self._extra_qemu_params
 		# Note: shlex.join() does what we want, but requires python 3.8+.
 		print('Running tests with:\n$', ' '.join(shlex.quote(arg) for arg in qemu_command))

tools/testing/kunit/qemu_configs/arm64.py

@@ -9,4 +9,4 @@
 			   qemu_arch='aarch64',
 			   kernel_path='arch/arm64/boot/Image.gz',
 			   kernel_command_line='console=ttyAMA0',
-			   extra_qemu_params=['-machine', 'virt', '-cpu', 'max,pauth-impdef=on'])
+			   extra_qemu_params=['-machine', 'virt', '-cpu', 'max'])