[RFC][PATCH 1/1] drm/msm: require python3 and xml.parsers.expat module

[Petr Vorel]

> On Wed, Nov 20, 2024 at 7:49 AM Petr Vorel <pvorel at suse.cz> wrote:

> > 0fddd045f88e introduced python3 dependency, require it to quick early.

> > Signed-off-by: Petr Vorel <pvorel at suse.cz>
> > ---
> > Hi all,

> > RFC because I'm not sure if previous failed build wasn't better:

> >         GENHDR  drivers/gpu/drm/msm/generated/a2xx.xml.h
> >         /bin/sh: python3: not found

> > This way it's documented, but CONFIG_DRM_MSM just silently disappears
> > from .config. Also because depends on $(success ..) is not evaluated
> > (understand, some expressions can be really long) one see only:
> > Depends on: n [=n].

> > I was thinking about testing via $(PYTHON3) -m "xml.parsers.expat",
> > but because expat parser (and other modules) should be part the official
> > python3 and are installed even on minimal python3 installations (e.g.
> > python3-minimal on Debian). Therefore depending on "$(PYTHON3) -V"
> > should be enough.


> Would it be more clear to do something like:

> config HAS_PYTHON3
>       dev_bool $(success ...)

> (in init/Kconfig or somewhere central) and then use 'depends on
> HAS_PYTHON3'?  That might make the dependency easier to see in
> menuconfig/etc

Thanks a lot, good idea, there are already few config HAVE_* in it. I'll send
v2. Before I already noticed various variables in the top level Makefile (PERL,
BASH, RUSTC, ...), but didn't find any check. Just now I noticed HAVE_RUST in
arch/Kconfig. I suppose HAVE_PYTHON3 should be in init/Kconfig.

Kind regards,
Petr

> BR,
> -R

> > Kind regards,
> > Petr

> >  drivers/gpu/drm/msm/Kconfig | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)

> > diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> > index 90c68106b63b..2cf4573a2ff1 100644
> > --- a/drivers/gpu/drm/msm/Kconfig
> > +++ b/drivers/gpu/drm/msm/Kconfig
> > @@ -11,6 +11,7 @@ config DRM_MSM
> >         depends on QCOM_LLCC || QCOM_LLCC=n
> >         depends on QCOM_COMMAND_DB || QCOM_COMMAND_DB=n
> >         depends on PM
> > +       depends on $(success,$(PYTHON3) -V)
> >         select IOMMU_IO_PGTABLE
> >         select QCOM_MDT_LOADER if ARCH_QCOM
> >         select REGULATOR
> > @@ -36,7 +37,7 @@ config DRM_MSM
> >         select PM_GENERIC_DOMAINS
> >         select TRACE_GPU_MEM
> >         help
> > -         DRM/KMS driver for MSM/snapdragon.
> > +         DRM/KMS driver for MSM/snapdragon.  Requires python3.

> >  config DRM_MSM_GPU_STATE
> >         bool
> > --
> > 2.47.0