[LTP] [PATCH] kcmp03: Add check for KCMP_SYSVSEM before running test

[Cyril Hrubis]

Hi!
> This commit introduces a new function
> `is_kcmp_supported()` to check if the kernel supports the
> `KCMP_SYSVSEM` operation. In the `verify_kcmp()` function,
> we add logic to detect when the kernel does not support
> `KCMP_SYSVSEM` and skip the test for that case with a TCONF
> result. This ensures that the test does not fail when the
> Kconfig that supports `KCMP_SYSVSEM` is unavailable.

First of all the coding style is inconsistent, have you run 'make check'
in the test directory and fixed all the problems?

> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
> ---
>  testcases/kernel/syscalls/kcmp/kcmp03.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/testcases/kernel/syscalls/kcmp/kcmp03.c b/testcases/kernel/syscalls/kcmp/kcmp03.c
> index 37d5118d5..255171d98 100644
> --- a/testcases/kernel/syscalls/kcmp/kcmp03.c
> +++ b/testcases/kernel/syscalls/kcmp/kcmp03.c
> @@ -52,6 +52,12 @@ static void cleanup(void)
>  	free(stack);
>  }
>  
> +static int is_kcmp_supported(void)
> +{
> +	int result = syscall(__NR_kcmp, getpid(), getpid(), KCMP_SYSVSEM, 0, 0);

Why syscall() instead of kcmp() that is used in the rest of the test?

> +	return result == 0 || errno != EOPNOTSUPP;
> +}
> +
>  static int do_child(void *arg)
>  {
>  	pid2 = getpid();
> @@ -64,6 +70,13 @@ static void verify_kcmp(unsigned int n)
>  	int res;
>  	struct tcase *tc = &tcases[n];
>  
> +    // Handle the case for KCMP_SYSVSEM specifically
> +    if (tc->kcmp_type == KCMP_SYSVSEM) {
> +        if (!is_kcmp_supported()) {

This function should be called once from the test setup and the results
should be cached.

> +            tst_brk(TCONF, "Kernel does not support KCMP_SYSVSEM, skipping test.");

This should be just tst_res(TCONF, "..."); followed by return 0;

We do not want to abort subseqent test iterations (e.g. -i 2 on command
line) just because one operation is not supported.

> +	    }
> +	}


>  	pid1 = getpid();
>  	tst_res(TINFO, "Testing %s", tc->desc);
>  
> -- 
> 2.48.1
> 

-- 
Cyril Hrubis
chrubis@suse.cz