Re: [PATCH] selftests/mm: hugetlb_madv_vs_map: fix TAP plan mismatches

[Sarthak Sharma]

Hi Jaeyeon!

On 10/5/26 4:30 AM, Jaeyeon Lee wrote:
> The plan was raised from 1 to 3, but the HugeTLB setup check that may
> call ksft_exit_skip() still runs after ksft_set_plan(), so a setup
> failure reports one result against a plan of 3. Move ksft_set_plan()
> below the setup check.
> 
> Also, when the underflow check fails, or munmap() fails,
> test_underflow() jumps to err_cleanup and exits without reporting the
> remaining results. Report the munmap() failure as a test result and
> skip the final HugePages_Rsvd check in err_cleanup, so the output
> always contains the planned 3 results.
> 
> Fixes: 827149aad495 ("selftests/mm: hugetlb_madv_vs_map: add underflow test")
> Assisted-by: LLM
> Signed-off-by: Jaeyeon Lee <jaeyeon.lee.dev@xxxxxxxxx>
> ---
>  tools/testing/selftests/mm/hugetlb_madv_vs_map.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/hugetlb_madv_vs_map.c b/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
> index 1d111f42dd59..5dc44ff0a377 100644
> --- a/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
> +++ b/tools/testing/selftests/mm/hugetlb_madv_vs_map.c
> @@ -169,6 +169,7 @@ void test_underflow(void)
>  	/* First unmap, this will close the vma */
>  	if (munmap(huge_ptr, mmap_size) != 0) {
>  		ksft_perror("munmap failed");
> +		ksft_test_result_fail("munmap failed\n");

This is duplicating the "munmap failed" message. Can we simply put a
ksft_test_result_fail("munmap failed: %s (%d)\n", strerror(errno),
errno) here?

Also, please send your patch in a new thread instead of replying on
another thread from next time onwards :)

>  		goto err_cleanup;
>  	}
>  
> @@ -203,18 +204,20 @@ void test_underflow(void)
>  	if (waitpid(pid, NULL, 0) <= 0)
>  		ksft_exit_fail_perror("waitpid failed");
>  
> +	ksft_test_result_skip("HugePages_Rsvd check after child exit\n");
>  	ksft_exit_fail();
>  }
>  
>  int main(void)
>  {
>  	ksft_print_header();
> -	ksft_set_plan(3);
>  
>  	if (!hugetlb_setup_default_exact(1))
>  		ksft_exit_skip("This test needs one and only one page to execute. Got %lu\n",
>  			       hugetlb_free_default_pages());
>  
> +	ksft_set_plan(3);
> +
>  	test_madv_vs_map();
>  	test_underflow();
>