linux-kernel - Re: [PATCH v2 1/4] kselftests: vdso: vdso_test_clock

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Date: Tue, 11 Jun 2024 14:32:45 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Shuah Khan <shuah@...nel.org>, Vincenzo Frascino
 <vincenzo.frascino@....com>, Tiezhu Yang <yangtiezhu@...ngson.cn>,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: kernel@...labora.com, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2 1/4] kselftests: vdso: vdso_test_clock_getres: conform
 test to TAP output

On 6/9/24 23:41, Muhammad Usama Anjum wrote:
> Conform the layout, informational and status messages to TAP. No
> functional change is intended other than the layout of output messages.
> Use kselftest_harness.h to conform to TAP as the number of tests depend
> on the available options at build time. The kselftest_harness makes the


How does converting to kselftest_harness help with available options ay
build time? Can you explain?

I am not seeing any value in converting this test to the harness? I want
to see a better justification.

> test easy to convert and presents better maintainability.
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> Changes since v1:
> - Update commit message to include that kselftest_harness has been used
>    to conform to TAP and why
> ---
>   .../selftests/vDSO/vdso_test_clock_getres.c   | 68 +++++++++----------
>   1 file changed, 33 insertions(+), 35 deletions(-)
> 
> diff --git a/tools/testing/selftests/vDSO/vdso_test_clock_getres.c b/tools/testing/selftests/vDSO/vdso_test_clock_getres.c
> index 38d46a8bf7cba..c1ede40521f05 100644
> --- a/tools/testing/selftests/vDSO/vdso_test_clock_getres.c
> +++ b/tools/testing/selftests/vDSO/vdso_test_clock_getres.c
> @@ -25,7 +25,7 @@
>   #include <unistd.h>
>   #include <sys/syscall.h>
>   
> -#include "../kselftest.h"
> +#include "../kselftest_harness.h"
>   
>   static long syscall_clock_getres(clockid_t _clkid, struct timespec *_ts)
>   {
> @@ -54,18 +54,8 @@ const char *vdso_clock_name[12] = {
>   /*
>    * This function calls clock_getres in vdso and by system call
>    * with different values for clock_id.
> - *
> - * Example of output:
> - *
> - * clock_id: CLOCK_REALTIME [PASS]
> - * clock_id: CLOCK_BOOTTIME [PASS]
> - * clock_id: CLOCK_TAI [PASS]
> - * clock_id: CLOCK_REALTIME_COARSE [PASS]
> - * clock_id: CLOCK_MONOTONIC [PASS]
> - * clock_id: CLOCK_MONOTONIC_RAW [PASS]
> - * clock_id: CLOCK_MONOTONIC_COARSE [PASS]
>    */
> -static inline int vdso_test_clock(unsigned int clock_id)
> +static inline void vdso_test_clock(struct __test_metadata *_metadata, unsigned int clock_id)
>   {
>   	struct timespec x, y;
>   
> @@ -73,52 +63,60 @@ static inline int vdso_test_clock(unsigned int clock_id)
>   	clock_getres(clock_id, &x);
>   	syscall_clock_getres(clock_id, &y);
>   
> -	if ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)) {
> -		printf(" [FAIL]\n");
> -		return KSFT_FAIL;
> -	}
> -
> -	printf(" [PASS]\n");
> -	return KSFT_PASS;
> +	ASSERT_EQ(0, ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)));
>   }
>   
> -int main(int argc, char **argv)
> -{
> -	int ret = 0;
> -
>   #if _POSIX_TIMERS > 0
>   
>   #ifdef CLOCK_REALTIME
> -	ret += vdso_test_clock(CLOCK_REALTIME);
> +TEST(clock_realtime)
> +{
> +	vdso_test_clock(_metadata, CLOCK_REALTIME);
> +}
>   #endif
>   
>   #ifdef CLOCK_BOOTTIME
> -	ret += vdso_test_clock(CLOCK_BOOTTIME);
> +TEST(clock_boottime)
> +{
> +	vdso_test_clock(_metadata, CLOCK_BOOTTIME);
> +}
>   #endif
>   
>   #ifdef CLOCK_TAI
> -	ret += vdso_test_clock(CLOCK_TAI);
> +TEST(clock_tai)
> +{
> +	vdso_test_clock(_metadata, CLOCK_TAI);
> +}
>   #endif
>   
>   #ifdef CLOCK_REALTIME_COARSE
> -	ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
> +TEST(clock_realtime_coarse)
> +{
> +	vdso_test_clock(_metadata, CLOCK_REALTIME_COARSE);
> +}
>   #endif
>   
>   #ifdef CLOCK_MONOTONIC
> -	ret += vdso_test_clock(CLOCK_MONOTONIC);
> +TEST(clock_monotonic)
> +{
> +	vdso_test_clock(_metadata, CLOCK_MONOTONIC);
> +}
>   #endif
>   
>   #ifdef CLOCK_MONOTONIC_RAW
> -	ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
> +TEST(clock_monotonic_raw)
> +{
> +	vdso_test_clock(_metadata, CLOCK_MONOTONIC_RAW);
> +}
>   #endif
>   
>   #ifdef CLOCK_MONOTONIC_COARSE
> -	ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
> +TEST(clock_monotonic_coarse)
> +{
> +	vdso_test_clock(_metadata, CLOCK_MONOTONIC_COARSE);
> +}
>   #endif
>   
> -#endif
> -	if (ret > 0)
> -		return KSFT_FAIL;
> +#endif /* _POSIX_TIMERS > 0 */
>   
> -	return KSFT_PASS;
> -}
> +TEST_HARNESS_MAIN

thanks,
-- Shuah