linux-kernel - Re: [PATCH v2] selftests/bpf: Fix bind{4,6} tcp/socket header type conflict

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Message-ID: <20220826230455.b5dcrvlmollglhx3@kafai-mbp.dhcp.thefacebook.com>
Date:   Fri, 26 Aug 2022 16:04:55 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     James Hilliard <james.hilliard1@...il.com>
Cc:     bpf@...r.kernel.org, Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests/bpf: Fix bind{4,6} tcp/socket header type
 conflict

On Thu, Aug 25, 2022 at 11:29:22PM -0600, James Hilliard wrote:
> There is a potential for us to hit a type conflict when including
> netinet/tcp.h with sys/socket.h, we can remove these as they are not
> actually needed.
> 
> Fixes errors like:
> In file included from /usr/include/netinet/tcp.h:91,
>                  from progs/bind4_prog.c:10:
> /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:34:23: error: conflicting types for 'int8_t'; have 'char'
>    34 | typedef __INT8_TYPE__ int8_t;
>       |                       ^~~~~~
> In file included from /usr/include/x86_64-linux-gnu/sys/types.h:155,
>                  from /usr/include/x86_64-linux-gnu/bits/socket.h:29,
>                  from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
>                  from progs/bind4_prog.c:9:
> /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:24:18: note: previous declaration of 'int8_t' with type 'int8_t' {aka 'signed char'}
>    24 | typedef __int8_t int8_t;
>       |                  ^~~~~~
> /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:43:24: error: conflicting types for 'int64_t'; have 'long int'
>    43 | typedef __INT64_TYPE__ int64_t;
>       |                        ^~~~~~~
> /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: note: previous declaration of 'int64_t' with type 'int64_t' {aka 'long long int'}
>    27 | typedef __int64_t int64_t;
>       |                   ^~~~~~~
> make: *** [Makefile:537: /home/buildroot/bpf-next/tools/testing/selftests/bpf/bpf_gcc/bind4_prog.o] Error 1
> 
> Signed-off-by: James Hilliard <james.hilliard1@...il.com>
> ---
> Changes v1 -> v2:
>   - just remove netinet/tcp.h and sys/socket.h
> ---
>  tools/testing/selftests/bpf/progs/bind4_prog.c | 2 --
>  tools/testing/selftests/bpf/progs/bind6_prog.c | 2 --
>  2 files changed, 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/bind4_prog.c b/tools/testing/selftests/bpf/progs/bind4_prog.c
> index 474c6a62078a..a487f60b73ac 100644
> --- a/tools/testing/selftests/bpf/progs/bind4_prog.c
> +++ b/tools/testing/selftests/bpf/progs/bind4_prog.c
> @@ -6,8 +6,6 @@
>  #include <linux/bpf.h>
>  #include <linux/in.h>
>  #include <linux/in6.h>
> -#include <sys/socket.h>
> -#include <netinet/tcp.h>
>  #include <linux/if.h>
Are the AF_INET and SOCK_STREAM coming from linux/if.h somehow
and they are not from indirectly including sys/socket.h ?

If the program does not need if.h, what should it use ?
There are other progs in selftest/bpf that include sys/socket.h
and they have no issue ?