linux-kernel - Re: [PATCH 2/2] perf build: Add Debian/Ubuntu python-is-python3

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Message-ID: <CAMuHMdXEBX2CK8iE-Mc0dPR5gV5dBM6QU9LsEWnWgO-d=o6xVg@mail.gmail.com>
Date: Mon, 20 Oct 2025 12:15:22 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Leo Yan <leo.yan@....com>
Cc: Namhyung Kim <namhyung@...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>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf build: Add Debian/Ubuntu python-is-python3

Hi Leo,

On Mon, 20 Oct 2025 at 11:31, Leo Yan <leo.yan@....com> wrote:
> On Sun, Oct 19, 2025 at 11:49:56AM +0900, Namhyung Kim wrote:
> > > Aha, I found it.  After uninstalling python3-dev, I got into the same
> > > state as yesterday:
> > >
> > >     $ make tools/perf
> > >     [...]
> > >     Makefile.config:875: No python interpreter was found: disables
> > > Python support - please install python-devel/python-dev
> > >     Makefile.config:918: *** ERROR: No python interpreter needed for
> > > jevents generation. Install python or build with NO_JEVENTS=1..  Stop.
> > >
> > > So these error messages sound like python is missing. And "python"
> > > is indeed missing, but "python3" is available.
> > > Hence I installed python-is-python3, but that turned out not to be
> > > sufficient.
> > > Hence I also installed python-dev-is-python3, and that fixed the issue,
> > > as python-dev-is-python3 depends on python3-dev, so the latter was
> > > installed, too.
> > >
> > > After removing python-is-python3 and python-dev-is-python3, everything
> > > keeps on working.  But if you never installed python3-dev manually,
> > > and run "sudo apt autoremove", python3-dev is uninstalled, reintroducing
> > > the issue.
> > >
> > > So just recomming to install python-dev-is-python3 in the error
> > > message should be sufficient?
> > >
> > > What do you think?
>
> Can we explicitly suggest that developers install python3-devel or
> python3-dev instead?  Two reasons:
>
> - python-dev-is-python3 is specific to Ubuntu/Debian; some distros do
>   not provide this package and even advocate against using unversioned
>   "/usr/bin/python" shebangs [1].
>
> - As Namhyung mentioned, perf has removed Python 2 support (at least
>   this is claimed), it is straightforward to install only the Python3
>   packages.

Suggesting python3-dev sounds good to me.
None of the two checks:

    ifndef PYTHON
      $(call disable-python,No python interpreter was found: disables
Python support - please install python-devel/python-dev)

    ifndef PYTHON
      $(error ERROR: No python interpreter found for jevents
generation. Install python or build with NO_JEVENTS=1.)

seem to be about the python interpreter anyway, but about the python
development environment.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds