Re: [PATCH] kselftest/arm64: Use ksft_perror() to log MTE failures

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

On Tue, Oct 29, 2024 at 12:34:21PM +0000, Mark Brown wrote:
> The logging in the allocation helpers variously uses ksft_print_msg() with
> very intermittent logging of errno and perror() (which won't produce KTAP
> conformant output) when logging the result of API calls that set errno.
> Standardise on using the ksft_perror() helper in these cases so that more
> information is available should the tests fail.
>
> Signed-off-by: Mark Brown <broonie@kernel.org>

Thanks very much for this! LGTM!

Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>

> ---
>  tools/testing/selftests/arm64/mte/mte_common_util.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/tools/testing/selftests/arm64/mte/mte_common_util.c b/tools/testing/selftests/arm64/mte/mte_common_util.c
> index 00ffd34c66d301ee7d5c99e6b8d9d5d944520b7f..46958b58801e90ceb79be76f57c7f72b50d43b3c 100644
> --- a/tools/testing/selftests/arm64/mte/mte_common_util.c
> +++ b/tools/testing/selftests/arm64/mte/mte_common_util.c
> @@ -150,13 +150,13 @@ static void *__mte_allocate_memory_range(size_t size, int mem_type, int mapping,
>  		map_flag |= MAP_PRIVATE;
>  	ptr = mmap(NULL, entire_size, prot_flag, map_flag, fd, 0);
>  	if (ptr == MAP_FAILED) {
> -		ksft_print_msg("FAIL: mmap allocation\n");
> +		ksft_perror("mmap()");
>  		return NULL;
>  	}
>  	if (mem_type == USE_MPROTECT) {
>  		if (mprotect(ptr, entire_size, prot_flag | PROT_MTE)) {
> +			ksft_perror("mprotect(PROT_MTE)");
>  			munmap(ptr, size);
> -			ksft_print_msg("FAIL: mprotect PROT_MTE property\n");
>  			return NULL;
>  		}
>  	}
> @@ -190,13 +190,13 @@ void *mte_allocate_file_memory(size_t size, int mem_type, int mapping, bool tags
>  	lseek(fd, 0, SEEK_SET);
>  	for (index = INIT_BUFFER_SIZE; index < size; index += INIT_BUFFER_SIZE) {
>  		if (write(fd, buffer, INIT_BUFFER_SIZE) != INIT_BUFFER_SIZE) {
> -			perror("initialising buffer");
> +			ksft_perror("initialising buffer");
>  			return NULL;
>  		}
>  	}
>  	index -= INIT_BUFFER_SIZE;
>  	if (write(fd, buffer, size - index) != size - index) {
> -		perror("initialising buffer");
> +		ksft_perror("initialising buffer");
>  		return NULL;
>  	}
>  	return __mte_allocate_memory_range(size, mem_type, mapping, 0, 0, tags, fd);
> @@ -217,12 +217,12 @@ void *mte_allocate_file_memory_tag_range(size_t size, int mem_type, int mapping,
>  	lseek(fd, 0, SEEK_SET);
>  	for (index = INIT_BUFFER_SIZE; index < map_size; index += INIT_BUFFER_SIZE)
>  		if (write(fd, buffer, INIT_BUFFER_SIZE) != INIT_BUFFER_SIZE) {
> -			perror("initialising buffer");
> +			ksft_perror("initialising buffer");
>  			return NULL;
>  		}
>  	index -= INIT_BUFFER_SIZE;
>  	if (write(fd, buffer, map_size - index) != map_size - index) {
> -		perror("initialising buffer");
> +		ksft_perror("initialising buffer");
>  		return NULL;
>  	}
>  	return __mte_allocate_memory_range(size, mem_type, mapping, range_before,
> @@ -359,7 +359,7 @@ int create_temp_file(void)
>  	/* Create a file in the tmpfs filesystem */
>  	fd = mkstemp(&filename[0]);
>  	if (fd == -1) {
> -		perror(filename);
> +		ksft_perror(filename);
>  		ksft_print_msg("FAIL: Unable to open temporary file\n");
>  		return 0;
>  	}
>
> ---
> base-commit: 8e929cb546ee42c9a61d24fae60605e9e3192354
> change-id: 20241028-arm64-mte-test-logging-6c6e737b1c62
>
> Best regards,
> --
> Mark Brown <broonie@kernel.org>
>