linux-kernel - Re: [PATCH bpf-next 09/11] samples: bpf: fix include order for non-Glibc environments

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Date:   Fri, 15 Apr 2022 16:55:27 -0700
From:   Song Liu <song@...nel.org>
To:     Alexander Lobakin <alobakin@...me>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Quentin Monnet <quentin@...valent.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Chenbo Feng <fengc@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Daniel Wagner <daniel.wagner@...-carit.de>,
        Thomas Graf <tgraf@...g.ch>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        linux-perf-users@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH bpf-next 09/11] samples: bpf: fix include order for
 non-Glibc environments

On Thu, Apr 14, 2022 at 3:47 PM Alexander Lobakin <alobakin@...me> wrote:
>
> Some standard C library implementations, e.g. Musl, ship the UAPI
> definitions themselves to not be dependent on the UAPI headers and
> their versions. Their kernel UAPI counterparts are usually guarded
> with some definitions which the formers set in order to avoid
> duplicate definitions.
> In such cases, include order matters. Change it in two samples: in
> the first, kernel UAPI ioctl definitions should go before the libc
> ones, and the opposite story with the second, where the kernel
> includes should go later to avoid struct redefinitions.
>
> Fixes: b4b8faa1ded7 ("samples/bpf: sample application and documentation for AF_XDP sockets")
> Fixes: e55190f26f92 ("samples/bpf: Fix build for task_fd_query_user.c")
> Signed-off-by: Alexander Lobakin <alobakin@...me>

Acked-by: Song Liu <songliubraving@...com>

> ---
>  samples/bpf/task_fd_query_user.c | 2 +-
>  samples/bpf/xdpsock_user.c       | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/samples/bpf/task_fd_query_user.c b/samples/bpf/task_fd_query_user.c
> index 424718c0872c..5d3a60547f9f 100644
> --- a/samples/bpf/task_fd_query_user.c
> +++ b/samples/bpf/task_fd_query_user.c
> @@ -9,10 +9,10 @@
>  #include <stdint.h>
>  #include <fcntl.h>
>  #include <linux/bpf.h>
> +#include <linux/perf_event.h>
>  #include <sys/ioctl.h>
>  #include <sys/types.h>
>  #include <sys/stat.h>
> -#include <linux/perf_event.h>
>
>  #include <bpf/bpf.h>
>  #include <bpf/libbpf.h>
> diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
> index be7d2572e3e6..399b999fcec2 100644
> --- a/samples/bpf/xdpsock_user.c
> +++ b/samples/bpf/xdpsock_user.c
> @@ -7,14 +7,15 @@
>  #include <linux/bpf.h>
>  #include <linux/if_link.h>
>  #include <linux/if_xdp.h>
> -#include <linux/if_ether.h>
>  #include <linux/ip.h>
>  #include <linux/limits.h>
> +#include <linux/net.h>
>  #include <linux/udp.h>
>  #include <arpa/inet.h>
>  #include <locale.h>
>  #include <net/ethernet.h>
>  #include <netinet/ether.h>
> +#include <linux/if_ether.h>
>  #include <net/if.h>
>  #include <poll.h>
>  #include <pthread.h>
> --
> 2.35.2
>
>