linux-kernel - Re: [GIT PULL] perf tools changes for v6.4

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Date:   Wed, 3 May 2023 20:00:09 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Kate Carcia <kcarcia@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Changbin Du <changbin.du@...wei.com>,
        Hao Luo <haoluo@...gle.com>, Ian Rogers <irogers@...gle.com>,
        James Clark <james.clark@....com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Roman Lozko <lozko.roma@...il.com>,
        Stephane Eranian <eranian@...gle.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL] perf tools changes for v6.4

On Wed, May 3, 2023 at 2:18 PM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
>         Please consider pulling,

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

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/vmlinux
  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 support.
  To disable this use the build option NO_BPF_SKEL=1.
  Alternatively point at a pre-generated vmlinux.h with VMLINUX_H=<path>.

the build system assumptions are clearly completely broken.

              Linus