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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 3 May 2023 20:00:09 -0700
Message-ID: <CAHk-=wjY_3cBELRSLMpqCt6Eb71Qei2agfKSNsrr5KcpdEQCaA@mail.gmail.com>
Subject: Re: [GIT PULL] perf tools changes for v6.4
To:     Arnaldo Carvalho de Melo <acme@kernel.org>
Cc:     Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Clark Williams <williams@redhat.com>,
        Kate Carcia <kcarcia@redhat.com>, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org,
        Adrian Hunter <adrian.hunter@intel.com>,
        Changbin Du <changbin.du@huawei.com>,
        Hao Luo <haoluo@google.com>, Ian Rogers <irogers@google.com>,
        James Clark <james.clark@arm.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Roman Lozko <lozko.roma@gmail.com>,
        Stephane Eranian <eranian@google.com>,
        Thomas Richter <tmricht@linux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
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On Wed, May 3, 2023 at 2:18=E2=80=AFPM Arnaldo Carvalho de Melo <acme@kerne=
l.org> wrote:
>
>         Please consider pulling,

I did consider it, but the end result doesn't even build, so I unpulled aga=
in..

I get some libbpf error, and I'm just not interested in trying to
debug it. This has clearly not been tested well enough to be merged.

  libbpf: failed to find '.BTF' ELF section in /home/torvalds/v2.6/linux/vm=
linux
  Error: failed to load BTF from /home/torvalds/v2.6/linux/vmlinux: No
data available
  Failure to generate vmlinux.h needed for the recommended BPF skeleton sup=
port.
  To disable this use the build option NO_BPF_SKEL=3D1.
  Alternatively point at a pre-generated vmlinux.h with VMLINUX_H=3D<path>.

the build system assumptions are clearly completely broken.

              Linus