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

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Date:   Wed, 3 May 2023 20:12:20 -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 8:00 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> 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.

Side note: its' not even about testing.

The error message makes it clear that this is garbage and should never
be merged even if it were to compile.

There is not a way in hell that it is correct that a 'perf' tool build
should ever even look at the vmlinux binary to build.

The fact that it does shows that something is seriously wrong in
perf-tool land, and I will not be touching any pulls until that
fundamental mistake is entirely gone.

The vmlinux image that is present in my tree (ie
/home/torvalds/v2.6/linux/vmlinux) is a test build with an insane
config. And the fact that the perf tool even looks at it is seriously
broken.

Whatever you are doing - stop it right now.

               Linus