linux-kernel - Re: [PATCH 3/5] kselftest: run tests by fixture

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Date:   Fri, 13 Mar 2020 16:27:54 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     shuah@...nel.org, luto@...capital.net, wad@...omium.org,
        linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 3/5] kselftest: run tests by fixture

On Thu, Mar 12, 2020 at 08:17:50PM -0700, Jakub Kicinski wrote:
> Now that all tests have a fixture object move from a global
> list of tests to a list of tests per fixture.
> 
> Order of tests may change as we will now group and run test
> fixture by fixture, rather than in declaration order.

I'm not convinced about this change. Declaration order is a pretty
intuitive result that I'd like to keep for the harness.

Can this change be avoided and still keep the final results of a
"mutable" fixture?

-Kees

> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  tools/testing/selftests/kselftest_harness.h | 42 ++++++++++++---------
>  1 file changed, 25 insertions(+), 17 deletions(-)
> 
> diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> index a396afe4a579..7a3392941a5b 100644
> --- a/tools/testing/selftests/kselftest_harness.h
> +++ b/tools/testing/selftests/kselftest_harness.h
> @@ -637,8 +637,11 @@
>  } while (0); OPTIONAL_HANDLER(_assert)
>  
>  /* Contains all the information about a fixture */
> +struct __test_metadata;
> +
>  struct __fixture_metadata {
>  	const char *name;
> +	struct __test_metadata *tests;
>  	struct __fixture_metadata *prev, *next;
>  } _fixture_global __attribute__((unused)) = {
>  	.name = "global",
> @@ -684,7 +687,6 @@ struct __test_metadata {
>  };
>  
>  /* Storage for the (global) tests to be run. */
> -static struct __test_metadata *__test_list;
>  static unsigned int __test_count;
>  
>  /*
> @@ -698,24 +700,26 @@ static unsigned int __test_count;
>   */
>  static inline void __register_test(struct __test_metadata *t)
>  {
> +	struct __fixture_metadata *f = t->fixture;
> +
>  	__test_count++;
>  	/* Circular linked list where only prev is circular. */
> -	if (__test_list == NULL) {
> -		__test_list = t;
> +	if (f->tests == NULL) {
> +		f->tests = t;
>  		t->next = NULL;
>  		t->prev = t;
>  		return;
>  	}
>  	if (__constructor_order == _CONSTRUCTOR_ORDER_FORWARD) {
>  		t->next = NULL;
> -		t->prev = __test_list->prev;
> +		t->prev = f->tests->prev;
>  		t->prev->next = t;
> -		__test_list->prev = t;
> +		f->tests->prev = t;
>  	} else {
> -		t->next = __test_list;
> +		t->next = f->tests;
>  		t->next->prev = t;
>  		t->prev = t;
> -		__test_list = t;
> +		f->tests = t;
>  	}
>  }
>  
> @@ -729,14 +733,15 @@ static inline int __bail(int for_realz, bool no_print, __u8 step)
>  	return 0;
>  }
>  
> -void __run_test(struct __test_metadata *t)
> +void __run_test(struct __fixture_metadata *f,
> +		struct __test_metadata *t)
>  {
>  	pid_t child_pid;
>  	int status;
>  
>  	t->passed = 1;
>  	t->trigger = 0;
> -	printf("[ RUN      ] %s.%s\n", t->fixture->name, t->name);
> +	printf("[ RUN      ] %s.%s\n", f->name, t->name);
>  	alarm(t->timeout);
>  	child_pid = fork();
>  	if (child_pid < 0) {
> @@ -786,13 +791,14 @@ void __run_test(struct __test_metadata *t)
>  		}
>  	}
>  	printf("[     %4s ] %s.%s\n", (t->passed ? "OK" : "FAIL"),
> -	       t->fixture->name, t->name);
> +	       f->name, t->name);
>  	alarm(0);
>  }
>  
>  static int test_harness_run(int __attribute__((unused)) argc,
>  			    char __attribute__((unused)) **argv)
>  {
> +	struct __fixture_metadata *f;
>  	struct __test_metadata *t;
>  	int ret = 0;
>  	unsigned int count = 0;
> @@ -801,13 +807,15 @@ static int test_harness_run(int __attribute__((unused)) argc,
>  	/* TODO(wad) add optional arguments similar to gtest. */
>  	printf("[==========] Running %u tests from %u test cases.\n",
>  	       __test_count, __fixture_count + 1);
> -	for (t = __test_list; t; t = t->next) {
> -		count++;
> -		__run_test(t);
> -		if (t->passed)
> -			pass_count++;
> -		else
> -			ret = 1;
> +	for (f = __fixture_list; f; f = f->next) {
> +		for (t = f->tests; t; t = t->next) {
> +			count++;
> +			__run_test(f, t);
> +			if (t->passed)
> +				pass_count++;
> +			else
> +				ret = 1;
> +		}
>  	}
>  	printf("[==========] %u / %u tests passed.\n", pass_count, count);
>  	printf("[  %s  ]\n", (ret ? "FAILED" : "PASSED"));
> -- 
> 2.24.1
> 

-- 
Kees Cook