Re: [PATCH bpf-next] libbpf: Use PRIu64 when printing ulimit value

From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>,
	Naresh Kamboju <naresh.kamboju@linaro.org>
Subject: Re: [PATCH bpf-next] libbpf: Use PRIu64 when printing ulimit value
Date: Wed, 18 Dec 2019 07:37:31 -0800	[thread overview]
Message-ID: <CAADnVQKP3-ebzctUi+7t9YcHkJWt-Y+BToksnhTBgbe2VseUCQ@mail.gmail.com> (raw)
In-Reply-To: <20191218112840.871338-1-toke@redhat.com>

On Wed, Dec 18, 2019 at 3:28 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> Naresh pointed out that libbpf builds fail on 32-bit architectures because
> rlimit.rlim_cur is defined as 'unsigned long long' on those architectures.
> Fix this by using the PRIu64 definition in printf.
>
> Fixes: dc3a2d254782 ("libbpf: Print hint about ulimit when getting permission denied error")
> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
> ---
>  tools/lib/bpf/libbpf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 3fe42d6b0c2f..ba31083998ce 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -117,7 +117,7 @@ static void pr_perm_msg(int err)
>                 return;
>
>         if (limit.rlim_cur < 1024)
> -               snprintf(buf, sizeof(buf), "%lu bytes", limit.rlim_cur);
> +               snprintf(buf, sizeof(buf), "%"PRIu64" bytes", limit.rlim_cur);

please use %zu and (size_t) cast like the rest of libbpf.
Thanks!