| Message ID | 20220625050838.1618469-2-davidgow@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Rework KUnit test execution in modules | expand |
On Sat, Jun 25, 2022 at 1:10 AM David Gow <davidgow@google.com> wrote: > > From: Jeremy Kerr <jk@codeconstruct.com.au> > > Currently, KUnit runs built-in tests and tests loaded from modules > differently. For built-in tests, the kunit_test_suite{,s}() macro adds a > list of suites in the .kunit_test_suites linker section. However, for > kernel modules, a module_init() function is used to run the test suites. > > This causes problems if tests are included in a module which already > defines module_init/exit_module functions, as they'll conflict with the > kunit-provided ones. > > This change removes the kunit-defined module inits, and instead parses > the kunit tests from their own section in the module. After module init, > we call __kunit_test_suites_init() on the contents of that section, > which prepares and runs the suite. > > This essentially unifies the module- and non-module kunit init formats. > > Tested-by: Maíra Canal <maira.canal@usp.br> > Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> > Signed-off-by: Daniel Latypov <dlatypov@google.com> > Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
On Fri, Jun 24, 2022 at 10:10 PM David Gow <davidgow@google.com> wrote: > diff --git a/include/kunit/test.h b/include/kunit/test.h > index 8ffcd7de9607..54306271cfbf 100644 > --- a/include/kunit/test.h > +++ b/include/kunit/test.h > @@ -250,41 +250,8 @@ static inline int kunit_run_all_tests(void) > } > #endif /* IS_BUILTIN(CONFIG_KUNIT) */ > > -#ifdef MODULE > -/** > - * kunit_test_suites_for_module() - used to register one or more > - * &struct kunit_suite with KUnit. > - * > - * @__suites: a statically allocated list of &struct kunit_suite. > - * > - * Registers @__suites with the test framework. See &struct kunit_suite for > - * more information. > - * > - * If a test suite is built-in, module_init() gets translated into > - * an initcall which we don't want as the idea is that for builtins > - * the executor will manage execution. So ensure we do not define > - * module_{init|exit} functions for the builtin case when registering > - * suites via kunit_test_suites() below. > - */ > -#define kunit_test_suites_for_module(__suites) \ Deleting this bit now causes merge conflicts with Shuah's kunit branch, due to https://patchwork.kernel.org/project/linux-kselftest/patch/20220702040959.3232874-3-davidgow@google.com/ I.e. We added in a MODULE_INFO(test, "Y") in this to-be-deleted section. Perhaps something like this would be a fix? #ifdef MODULE #define _kunit_mark_test_module MODULE_INFO(test, "Y") #else #define _kunit_mark_test_module #endif /* MODULE */ #define __kunit_test_suites(unique_array, unique_suites, ...) \ _kunit_mark_test_module; \ static struct kunit_suite *unique_array[] = { __VA_ARGS__, NULL }; \ static struct kunit_suite **unique_suites \ __used __section(".kunit_test_suites") = unique_array > - static int __init kunit_test_suites_init(void) \ > - { \ > - return __kunit_test_suites_init(__suites); \ > - } \ > - module_init(kunit_test_suites_init); \ > - \ > - static void __exit kunit_test_suites_exit(void) \ > - { \ > - return __kunit_test_suites_exit(__suites); \ > - } \ > - module_exit(kunit_test_suites_exit) > -#else > -#define kunit_test_suites_for_module(__suites) > -#endif /* MODULE */ > - > #define __kunit_test_suites(unique_array, unique_suites, ...) \ > static struct kunit_suite *unique_array[] = { __VA_ARGS__, NULL }; \ > - kunit_test_suites_for_module(unique_array); \ > static struct kunit_suite **unique_suites \ > __used __section(".kunit_test_suites") = unique_array >
On Sat, Jul 9, 2022 at 2:23 AM Daniel Latypov <dlatypov@google.com> wrote: > > On Fri, Jun 24, 2022 at 10:10 PM David Gow <davidgow@google.com> wrote: > > diff --git a/include/kunit/test.h b/include/kunit/test.h > > index 8ffcd7de9607..54306271cfbf 100644 > > --- a/include/kunit/test.h > > +++ b/include/kunit/test.h > > @@ -250,41 +250,8 @@ static inline int kunit_run_all_tests(void) > > } > > #endif /* IS_BUILTIN(CONFIG_KUNIT) */ > > > > -#ifdef MODULE > > -/** > > - * kunit_test_suites_for_module() - used to register one or more > > - * &struct kunit_suite with KUnit. > > - * > > - * @__suites: a statically allocated list of &struct kunit_suite. > > - * > > - * Registers @__suites with the test framework. See &struct kunit_suite for > > - * more information. > > - * > > - * If a test suite is built-in, module_init() gets translated into > > - * an initcall which we don't want as the idea is that for builtins > > - * the executor will manage execution. So ensure we do not define > > - * module_{init|exit} functions for the builtin case when registering > > - * suites via kunit_test_suites() below. > > - */ > > -#define kunit_test_suites_for_module(__suites) \ > > Deleting this bit now causes merge conflicts with Shuah's kunit > branch, due to https://patchwork.kernel.org/project/linux-kselftest/patch/20220702040959.3232874-3-davidgow@google.com/ > I.e. We added in a MODULE_INFO(test, "Y") in this to-be-deleted section. Nice catch. I've rebased this series on top of the taint stuff: https://lore.kernel.org/linux-kselftest/20220709032001.819487-2-davidgow@google.com/T/#u > Perhaps something like this would be a fix? Thanks.The rebased version is basically this, but without the #ifdef MODULE indirection, as MODULE_INFO() will decay to nothing if MODULE is not defined, anyway. > #ifdef MODULE > #define _kunit_mark_test_module MODULE_INFO(test, "Y") > #else > #define _kunit_mark_test_module > #endif /* MODULE */ > > #define __kunit_test_suites(unique_array, unique_suites, ...) > \ > _kunit_mark_test_module; > \ > static struct kunit_suite *unique_array[] = { __VA_ARGS__, > NULL }; \ > static struct kunit_suite **unique_suites > \ > __used __section(".kunit_test_suites") = unique_array > > > > - static int __init kunit_test_suites_init(void) \ > > - { \ > > - return __kunit_test_suites_init(__suites); \ > > - } \ > > - module_init(kunit_test_suites_init); \ > > - \ > > - static void __exit kunit_test_suites_exit(void) \ > > - { \ > > - return __kunit_test_suites_exit(__suites); \ > > - } \ > > - module_exit(kunit_test_suites_exit) > > -#else > > -#define kunit_test_suites_for_module(__suites) > > -#endif /* MODULE */ > > - > > #define __kunit_test_suites(unique_array, unique_suites, ...) \ > > static struct kunit_suite *unique_array[] = { __VA_ARGS__, NULL }; \ > > - kunit_test_suites_for_module(unique_array); \ > > static struct kunit_suite **unique_suites \ > > __used __section(".kunit_test_suites") = unique_array > >
diff --git a/include/kunit/test.h b/include/kunit/test.h index 8ffcd7de9607..54306271cfbf 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -250,41 +250,8 @@ static inline int kunit_run_all_tests(void) } #endif /* IS_BUILTIN(CONFIG_KUNIT) */ -#ifdef MODULE -/** - * kunit_test_suites_for_module() - used to register one or more - * &struct kunit_suite with KUnit. - * - * @__suites: a statically allocated list of &struct kunit_suite. - * - * Registers @__suites with the test framework. See &struct kunit_suite for - * more information. - * - * If a test suite is built-in, module_init() gets translated into - * an initcall which we don't want as the idea is that for builtins - * the executor will manage execution. So ensure we do not define - * module_{init|exit} functions for the builtin case when registering - * suites via kunit_test_suites() below. - */ -#define kunit_test_suites_for_module(__suites) \ - static int __init kunit_test_suites_init(void) \ - { \ - return __kunit_test_suites_init(__suites); \ - } \ - module_init(kunit_test_suites_init); \ - \ - static void __exit kunit_test_suites_exit(void) \ - { \ - return __kunit_test_suites_exit(__suites); \ - } \ - module_exit(kunit_test_suites_exit) -#else -#define kunit_test_suites_for_module(__suites) -#endif /* MODULE */ - #define __kunit_test_suites(unique_array, unique_suites, ...) \ static struct kunit_suite *unique_array[] = { __VA_ARGS__, NULL }; \ - kunit_test_suites_for_module(unique_array); \ static struct kunit_suite **unique_suites \ __used __section(".kunit_test_suites") = unique_array @@ -294,16 +261,12 @@ static inline int kunit_run_all_tests(void) * * @__suites: a statically allocated list of &struct kunit_suite. * - * Registers @suites with the test framework. See &struct kunit_suite for - * more information. - * - * When builtin, KUnit tests are all run via executor; this is done - * by placing the array of struct kunit_suite * in the .kunit_test_suites - * ELF section. + * Registers @suites with the test framework. + * This is done by placing the array of struct kunit_suite * in the + * .kunit_test_suites ELF section. * - * An alternative is to build the tests as a module. Because modules do not - * support multiple initcall()s, we need to initialize an array of suites for a - * module. + * When builtin, KUnit tests are all run via the executor at boot, and when + * built as a module, they run on module load. * */ #define kunit_test_suites(__suites...) \ diff --git a/include/linux/module.h b/include/linux/module.h index abd9fa916b7d..2490223c975d 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -505,6 +505,11 @@ struct module { int num_static_call_sites; struct static_call_site *static_call_sites; #endif +#if IS_ENABLED(CONFIG_KUNIT) + int num_kunit_suites; + struct kunit_suite ***kunit_suites; +#endif + #ifdef CONFIG_LIVEPATCH bool klp; /* Is this a livepatch module? */ diff --git a/kernel/module/main.c b/kernel/module/main.c index fed58d30725d..4542db7cdf54 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -2087,6 +2087,12 @@ static int find_module_sections(struct module *mod, struct load_info *info) sizeof(*mod->static_call_sites), &mod->num_static_call_sites); #endif +#ifdef CONFIG_KUNIT + mod->kunit_suites = section_objs(info, ".kunit_test_suites", + sizeof(*mod->kunit_suites), + &mod->num_kunit_suites); +#endif + mod->extable = section_objs(info, "__ex_table", sizeof(*mod->extable), &mod->num_exentries); diff --git a/lib/kunit/test.c b/lib/kunit/test.c index a5053a07409f..3052526b9b89 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -10,6 +10,7 @@ #include <kunit/test.h> #include <kunit/test-bug.h> #include <linux/kernel.h> +#include <linux/module.h> #include <linux/moduleparam.h> #include <linux/sched/debug.h> #include <linux/sched.h> @@ -609,6 +610,49 @@ void __kunit_test_suites_exit(struct kunit_suite **suites) } EXPORT_SYMBOL_GPL(__kunit_test_suites_exit); +#ifdef CONFIG_MODULES +static void kunit_module_init(struct module *mod) +{ + unsigned int i; + + for (i = 0; i < mod->num_kunit_suites; i++) + __kunit_test_suites_init(mod->kunit_suites[i]); +} + +static void kunit_module_exit(struct module *mod) +{ + unsigned int i; + + for (i = 0; i < mod->num_kunit_suites; i++) + __kunit_test_suites_exit(mod->kunit_suites[i]); +} + +static int kunit_module_notify(struct notifier_block *nb, unsigned long val, + void *data) +{ + struct module *mod = data; + + switch (val) { + case MODULE_STATE_LIVE: + kunit_module_init(mod); + break; + case MODULE_STATE_GOING: + kunit_module_exit(mod); + break; + case MODULE_STATE_COMING: + case MODULE_STATE_UNFORMED: + break; + } + + return 0; +} + +static struct notifier_block kunit_mod_nb = { + .notifier_call = kunit_module_notify, + .priority = 0, +}; +#endif + struct kunit_kmalloc_array_params { size_t n; size_t size; @@ -703,13 +747,19 @@ EXPORT_SYMBOL_GPL(kunit_cleanup); static int __init kunit_init(void) { kunit_debugfs_init(); - +#ifdef CONFIG_MODULES + return register_module_notifier(&kunit_mod_nb); +#else return 0; +#endif } late_initcall(kunit_init); static void __exit kunit_exit(void) { +#ifdef CONFIG_MODULES + unregister_module_notifier(&kunit_mod_nb); +#endif kunit_debugfs_cleanup(); } module_exit(kunit_exit);