On Wed, 16 Mar 2022 19:50:40 +0800 Guo Zhengkui wrote:
> When I compile tools/testing/selftests/net/ by
> `make -C tools/testing/selftests/net` with gcc (Debian 8.3.0-6) 8.3.0,
> it reports the following warnings:
>
> txtimestamp.c: In function 'validate_timestamp':
> txtimestamp.c:164:29: warning: format '%lu' expects argument of type
> 'long unsigned int', but argument 3 has type 'int64_t'
> {aka 'long long int'} [-Wformat=]
> fprintf(stderr, "ERROR: %lu us expected between %d and %d\n",
> ~~^
> %llu
> cur64 - start64, min_delay, max_delay);
> ~~~~~~~~~~~~~~~
> txtimestamp.c: In function '__print_ts_delta_formatted':
> txtimestamp.c:173:22: warning: format '%lu' expects argument of type
> 'long unsigned int', but argument 3 has type 'int64_t'
> {aka 'long long int'} [-Wformat=]
> fprintf(stderr, "%lu ns", ts_delta);
> ~~^ ~~~~~~~~
> %llu
> txtimestamp.c:175:22: warning: format '%lu' expects argument of type
> 'long unsigned int', but argument 3 has type 'int64_t'
> {aka 'long long int'} [-Wformat=]
> fprintf(stderr, "%lu us", ts_delta / NSEC_PER_USEC);
> ~~^
> %llu
>
> `int64_t` is the alias for `long long int`. '%lld' is more suitable.
That's on 32bit machines, I think what you need to use is PRId64.
Or just cast the result / change variable types to long long.
