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References: <20231213010201.1802507-1-rmoar@google.com> <20231213010201.1802507-2-rmoar@google.com>
In-Reply-To: <20231213010201.1802507-2-rmoar@google.com>
From:   David Gow <davidgow@google.com>
Date:   Wed, 13 Dec 2023 15:13:19 +0800
Message-ID: <CABVgOSm564viRs+CsKc8uyEZ71CU-+qH_R8E5hJrQiPTaSBiGg@mail.gmail.com>
Subject: Re: [PATCH v4 2/6] kunit: add KUNIT_INIT_TABLE to init linker section
To:     Rae Moar <rmoar@google.com>
Cc:     shuah@kernel.org, dlatypov@google.com, brendan.higgins@linux.dev,
        sadiyakazi@google.com, keescook@chromium.org, arnd@arndb.de,
        linux-kselftest@vger.kernel.org, linux-arch@vger.kernel.org,
        kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org
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On Wed, 13 Dec 2023 at 09:02, Rae Moar <rmoar@google.com> wrote:
>
> Add KUNIT_INIT_TABLE to the INIT_DATA linker section.
>
> Alter the KUnit macros to create init tests:
> kunit_test_init_section_suites
>
> Update lib/kunit/executor.c to run both the suites in KUNIT_TABLE and
> KUNIT_INIT_TABLE.
>
> Signed-off-by: Rae Moar <rmoar@google.com>
> ---
> Changes since v3:
> - Add to comments in test.h for kunit_test_init_section_suites macro to
>   note init tests cannot be run after boot and the structs cannot be
>   marked with __initdata
>

Thanks -- this is looking good.

Reviewed-by: David Gow <davidgow@google.com>

Cheers,
-- David


>  include/asm-generic/vmlinux.lds.h |  9 ++++-
>  include/kunit/test.h              | 30 +++++++++------
>  include/linux/module.h            |  2 +
>  kernel/module/main.c              |  3 ++
>  lib/kunit/executor.c              | 64 ++++++++++++++++++++++++++++---
>  lib/kunit/test.c                  | 26 +++++++++----
>  6 files changed, 109 insertions(+), 25 deletions(-)
>
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 1107905d37fc..5dd3a61d673d 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -700,7 +700,8 @@
>         THERMAL_TABLE(governor)                                         \
>         EARLYCON_TABLE()                                                \
>         LSM_TABLE()                                                     \
> -       EARLY_LSM_TABLE()
> +       EARLY_LSM_TABLE()                                               \
> +       KUNIT_INIT_TABLE()
>
>  #define INIT_TEXT                                                      \
>         *(.init.text .init.text.*)                                      \
> @@ -926,6 +927,12 @@
>                 . = ALIGN(8);                                           \
>                 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
>
> +/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
> +#define KUNIT_INIT_TABLE()                                             \
> +               . = ALIGN(8);                                           \
> +               BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \
> +                               __kunit_init_suites, _start, _end)
> +
>  #ifdef CONFIG_BLK_DEV_INITRD
>  #define INIT_RAM_FS                                                    \
>         . = ALIGN(4);                                                   \
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 20ed9f9275c9..fe79cd736e94 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -337,6 +337,9 @@ void __kunit_test_suites_exit(struct kunit_suite **suites, int num_suites);
>  void kunit_exec_run_tests(struct kunit_suite_set *suite_set, bool builtin);
>  void kunit_exec_list_tests(struct kunit_suite_set *suite_set, bool include_attr);
>
> +struct kunit_suite_set kunit_merge_suite_sets(struct kunit_suite_set init_suite_set,
> +               struct kunit_suite_set suite_set);
> +
>  #if IS_BUILTIN(CONFIG_KUNIT)
>  int kunit_run_all_tests(void);
>  #else
> @@ -371,6 +374,11 @@ static inline int kunit_run_all_tests(void)
>
>  #define kunit_test_suite(suite)        kunit_test_suites(&suite)
>
> +#define __kunit_init_test_suites(unique_array, ...)                           \
> +       static struct kunit_suite *unique_array[]                              \
> +       __aligned(sizeof(struct kunit_suite *))                                \
> +       __used __section(".kunit_init_test_suites") = { __VA_ARGS__ }
> +
>  /**
>   * kunit_test_init_section_suites() - used to register one or more &struct
>   *                                   kunit_suite containing init functions or
> @@ -378,21 +386,21 @@ static inline int kunit_run_all_tests(void)
>   *
>   * @__suites: a statically allocated list of &struct kunit_suite.
>   *
> - * This functions identically as kunit_test_suites() except that it suppresses
> - * modpost warnings for referencing functions marked __init or data marked
> - * __initdata; this is OK because currently KUnit only runs tests upon boot
> - * during the init phase or upon loading a module during the init phase.
> + * This functions similar to kunit_test_suites() except that it compiles the
> + * list of suites during init phase.
> + *
> + * This macro also suffixes the array and suite declarations it makes with
> + * _probe; so that modpost suppresses warnings about referencing init data
> + * for symbols named in this manner.
>   *
> - * NOTE TO KUNIT DEVS: If we ever allow KUnit tests to be run after boot, these
> - * tests must be excluded.
> + * Note: these init tests are not able to be run after boot so there is no
> + * "run" debugfs file generated for these tests.
>   *
> - * The only thing this macro does that's different from kunit_test_suites is
> - * that it suffixes the array and suite declarations it makes with _probe;
> - * modpost suppresses warnings about referencing init data for symbols named in
> - * this manner.
> + * Also, do not mark the suite or test case structs with __initdata because
> + * they will be used after the init phase with debugfs.
>   */
>  #define kunit_test_init_section_suites(__suites...)                    \
> -       __kunit_test_suites(CONCATENATE(__UNIQUE_ID(array), _probe),    \
> +       __kunit_init_test_suites(CONCATENATE(__UNIQUE_ID(array), _probe), \
>                             ##__suites)
>
>  #define kunit_test_init_section_suite(suite)   \
> diff --git a/include/linux/module.h b/include/linux/module.h
> index a98e188cf37b..9cd0009bd050 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -540,6 +540,8 @@ struct module {
>         struct static_call_site *static_call_sites;
>  #endif
>  #if IS_ENABLED(CONFIG_KUNIT)
> +       int num_kunit_init_suites;
> +       struct kunit_suite **kunit_init_suites;
>         int num_kunit_suites;
>         struct kunit_suite **kunit_suites;
>  #endif
> diff --git a/kernel/module/main.c b/kernel/module/main.c
> index 98fedfdb8db5..36681911c05a 100644
> --- a/kernel/module/main.c
> +++ b/kernel/module/main.c
> @@ -2199,6 +2199,9 @@ static int find_module_sections(struct module *mod, struct load_info *info)
>         mod->kunit_suites = section_objs(info, ".kunit_test_suites",
>                                               sizeof(*mod->kunit_suites),
>                                               &mod->num_kunit_suites);
> +       mod->kunit_init_suites = section_objs(info, ".kunit_init_test_suites",
> +                                             sizeof(*mod->kunit_init_suites),
> +                                             &mod->num_kunit_init_suites);
>  #endif
>
>         mod->extable = section_objs(info, "__ex_table",
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> index 1236b3cd2fbb..847329c51e91 100644
> --- a/lib/kunit/executor.c
> +++ b/lib/kunit/executor.c
> @@ -12,6 +12,8 @@
>   */
>  extern struct kunit_suite * const __kunit_suites_start[];
>  extern struct kunit_suite * const __kunit_suites_end[];
> +extern struct kunit_suite * const __kunit_init_suites_start[];
> +extern struct kunit_suite * const __kunit_init_suites_end[];
>
>  static char *action_param;
>
> @@ -292,6 +294,33 @@ void kunit_exec_list_tests(struct kunit_suite_set *suite_set, bool include_attr)
>         }
>  }
>
> +struct kunit_suite_set kunit_merge_suite_sets(struct kunit_suite_set init_suite_set,
> +               struct kunit_suite_set suite_set)
> +{
> +       struct kunit_suite_set total_suite_set = {NULL, NULL};
> +       struct kunit_suite **total_suite_start = NULL;
> +       size_t init_num_suites, num_suites, suite_size;
> +
> +       init_num_suites = init_suite_set.end - init_suite_set.start;
> +       num_suites = suite_set.end - suite_set.start;
> +       suite_size = sizeof(suite_set.start);
> +
> +       /* Allocate memory for array of all kunit suites */
> +       total_suite_start = kmalloc_array(init_num_suites + num_suites, suite_size, GFP_KERNEL);
> +       if (!total_suite_start)
> +               return total_suite_set;
> +
> +       /* Append init suites and then all other kunit suites */
> +       memcpy(total_suite_start, init_suite_set.start, init_num_suites * suite_size);
> +       memcpy(total_suite_start + init_num_suites, suite_set.start, num_suites * suite_size);
> +
> +       /* Set kunit suite set start and end */
> +       total_suite_set.start = total_suite_start;
> +       total_suite_set.end = total_suite_start + (init_num_suites + num_suites);
> +
> +       return total_suite_set;
> +}
> +
>  #if IS_BUILTIN(CONFIG_KUNIT)
>
>  static char *kunit_shutdown;
> @@ -313,21 +342,41 @@ static void kunit_handle_shutdown(void)
>
>  int kunit_run_all_tests(void)
>  {
> -       struct kunit_suite_set suite_set = {
> +       struct kunit_suite_set suite_set = {NULL, NULL};
> +       struct kunit_suite_set filtered_suite_set = {NULL, NULL};
> +       struct kunit_suite_set init_suite_set = {
> +               __kunit_init_suites_start, __kunit_init_suites_end,
> +       };
> +       struct kunit_suite_set normal_suite_set = {
>                 __kunit_suites_start, __kunit_suites_end,
>         };
> +       size_t init_num_suites = init_suite_set.end - init_suite_set.start;
>         int err = 0;
> +
> +       if (init_num_suites > 0) {
> +               suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
> +               if (!suite_set.start)
> +                       goto out;
> +       } else
> +               suite_set = normal_suite_set;
> +
>         if (!kunit_enabled()) {
>                 pr_info("kunit: disabled\n");
> -               goto out;
> +               goto free_out;
>         }
>
>         if (filter_glob_param || filter_param) {
> -               suite_set = kunit_filter_suites(&suite_set, filter_glob_param,
> +               filtered_suite_set = kunit_filter_suites(&suite_set, filter_glob_param,
>                                 filter_param, filter_action_param, &err);
> +
> +               /* Free original suite set before using filtered suite set */
> +               if (init_num_suites > 0)
> +                       kfree(suite_set.start);
> +               suite_set = filtered_suite_set;
> +
>                 if (err) {
>                         pr_err("kunit executor: error filtering suites: %d\n", err);
> -                       goto out;
> +                       goto free_out;
>                 }
>         }
>
> @@ -340,9 +389,12 @@ int kunit_run_all_tests(void)
>         else
>                 pr_err("kunit executor: unknown action '%s'\n", action_param);
>
> -       if (filter_glob_param || filter_param) { /* a copy was made of each suite */
> +free_out:
> +       if (filter_glob_param || filter_param)
>                 kunit_free_suite_set(suite_set);
> -       }
> +       else if (init_num_suites > 0)
> +               /* Don't use kunit_free_suite_set because suites aren't individually allocated */
> +               kfree(suite_set.start);
>
>  out:
>         kunit_handle_shutdown();
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 0308865194bb..6c082911a85f 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -704,28 +704,40 @@ EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
>  #ifdef CONFIG_MODULES
>  static void kunit_module_init(struct module *mod)
>  {
> -       struct kunit_suite_set suite_set = {
> +       struct kunit_suite_set suite_set, filtered_set;
> +       struct kunit_suite_set normal_suite_set = {
>                 mod->kunit_suites, mod->kunit_suites + mod->num_kunit_suites,
>         };
> +       struct kunit_suite_set init_suite_set = {
> +               mod->kunit_init_suites, mod->kunit_init_suites + mod->num_kunit_init_suites,
> +       };
>         const char *action = kunit_action();
>         int err = 0;
>
> -       suite_set = kunit_filter_suites(&suite_set,
> +       if (mod->num_kunit_init_suites > 0)
> +               suite_set = kunit_merge_suite_sets(init_suite_set, normal_suite_set);
> +       else
> +               suite_set = normal_suite_set;
> +
> +       filtered_set = kunit_filter_suites(&suite_set,
>                                         kunit_filter_glob() ?: "*.*",
>                                         kunit_filter(), kunit_filter_action(),
>                                         &err);
>         if (err)
>                 pr_err("kunit module: error filtering suites: %d\n", err);
>
> -       mod->kunit_suites = (struct kunit_suite **)suite_set.start;
> -       mod->num_kunit_suites = suite_set.end - suite_set.start;
> +       mod->kunit_suites = (struct kunit_suite **)filtered_set.start;
> +       mod->num_kunit_suites = filtered_set.end - filtered_set.start;
> +
> +       if (mod->num_kunit_init_suites > 0)
> +               kfree(suite_set.start);
>
>         if (!action)
> -               kunit_exec_run_tests(&suite_set, false);
> +               kunit_exec_run_tests(&filtered_set, false);
>         else if (!strcmp(action, "list"))
> -               kunit_exec_list_tests(&suite_set, false);
> +               kunit_exec_list_tests(&filtered_set, false);
>         else if (!strcmp(action, "list_attr"))
> -               kunit_exec_list_tests(&suite_set, true);
> +               kunit_exec_list_tests(&filtered_set, true);
>         else
>                 pr_err("kunit: unknown action '%s'\n", action);
>  }
> --
> 2.43.0.472.g3155946c3a-goog
>

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