Re: [PATCH v3 01/10] selftests/mm: Report errno when things fail in gup_longterm

[David Hildenbrand]

>   
>   		/*
>   		 * TODO: if the kernel ever supports long-term R/W pinning on
> @@ -202,7 +204,8 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
>   		/* Skip on errors, as we might just lack kernel support. */
>   		ret = io_uring_queue_init(1, &ring, 0);
>   		if (ret < 0) {
> -			ksft_test_result_skip("io_uring_queue_init() failed\n");
> +			ksft_test_result_skip("io_uring_queue_init() failed (%s)\n",
> +					      strerror(errno));

This function is documented to return -errno. I'm not sure if errno is 
guaranteed to be left unmodified (not clearly documented in the man 
page). So you might just want to use strerror(-ret) here.

Same applies to the other io_uring functions.

--
Cheers,

David / dhildenb