linux-kernel - Re: Building perf with BUILD_BPF

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Date:   Fri, 3 Dec 2021 19:40:54 +0000
From:   Song Liu <songliubraving@...com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>
Subject: Re: Building perf with BUILD_BPF_SKEL=1 by default



> On Dec 3, 2021, at 6:23 AM, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> Em Fri, Dec 03, 2021 at 10:28:00AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Fri, Dec 03, 2021 at 10:10:42AM -0300, Arnaldo Carvalho de Melo escreve

[...]

>  CLANG   /tmp/build/perf/util/bpf_skel/.tmp/bperf_cgroup.bpf.o
>  CLANG   /tmp/build/perf/util/bpf_skel/.tmp/bperf_follower.bpf.o
> util/bpf_skel/bpf_prog_profiler.bpf.c:18:21: error: invalid application of 'sizeof' to an incomplete type 'struct bpf_perf_event_value'
>        __uint(value_size, sizeof(struct bpf_perf_event_value));
>                           ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /tmp/build/perf/libbpf/include/bpf/bpf_helpers.h:13:39: note: expanded from macro '__uint'
> #define __uint(name, val) int (*name)[val]
>                                      ^~~
> /tmp/build/perf/libbpf/include/bpf/bpf_helper_defs.h:7:8: note: forward declaration of 'struct bpf_perf_event_value'
> struct bpf_perf_event_value;
>       ^
> util/bpf_skel/bpf_prog_profiler.bpf.c:26:21: error: invalid application of 'sizeof' to an incomplete type 'struct bpf_perf_event_value'
>        __uint(value_size, sizeof(struct bpf_perf_event_value));
>                           ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I guess the vmlinux.h fix should also resolve this one?

Thanks,
Song