netdev - Re: [PATCH bpf-next 8/8] samples/bpf: remove compiler warnings

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Date:   Tue, 12 May 2020 15:30:40 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 8/8] samples/bpf: remove compiler warnings

On Tue, May 12, 2020 at 8:54 AM Yonghong Song <yhs@...com> wrote:
>
> Commit 5fbc220862fc ("tools/libpf: Add offsetof/container_of macro
> in bpf_helpers.h") added macros offsetof/container_of to
> bpf_helpers.h. Unfortunately, it caused compilation warnings
> below for a few samples/bpf programs:
>   In file included from /data/users/yhs/work/net-next/samples/bpf/sockex2_kern.c:4:
>   In file included from /data/users/yhs/work/net-next/include/uapi/linux/in.h:24:
>   In file included from /data/users/yhs/work/net-next/include/linux/socket.h:8:
>   In file included from /data/users/yhs/work/net-next/include/linux/uio.h:8:
>   /data/users/yhs/work/net-next/include/linux/kernel.h:992:9: warning: 'container_of' macro redefined [-Wmacro-redefined]
>           ^
>   /data/users/yhs/work/net-next/tools/lib/bpf/bpf_helpers.h:46:9: note: previous definition is here
>           ^
>   1 warning generated.
>     CLANG-bpf  samples/bpf/sockex3_kern.o
>
> In all these cases, bpf_helpers.h is included first, followed by other
> standard headers. The macro container_of is defined unconditionally
> in kernel.h, causing the compiler warning.
>
> The fix is to move bpf_helpers.h after standard headers.
>
> Signed-off-by: Yonghong Song <yhs@...com>
> ---

LGTM.

Acked-by: Andrii Nakryiko <andriin@...com>

>  samples/bpf/offwaketime_kern.c | 4 ++--
>  samples/bpf/sockex2_kern.c     | 4 ++--
>  samples/bpf/sockex3_kern.c     | 4 ++--
>  3 files changed, 6 insertions(+), 6 deletions(-)
>

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