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

/* * 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.