linux-kernel - Re: [PATCH rebased] kbuild: rpm-pkg: Fix build with non-default MODLIB

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Message-ID: <20231009085208.GT6241@kitsune.suse.cz>
Date:   Mon, 9 Oct 2023 10:52:08 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-modules@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Jiri Slaby <jslaby@...e.com>, Jan Engelhardt <jengelh@...i.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH rebased] kbuild: rpm-pkg: Fix build with non-default
 MODLIB

Hello,

On Mon, Oct 09, 2023 at 05:31:02PM +0900, Masahiro Yamada wrote:
> On Fri, Oct 6, 2023 at 12:49 AM Michal Suchanek <msuchanek@...e.de> wrote:
> >
> > The default MODLIB value is composed of two variables and the hardcoded
> > string '/lib/modules/'.
> >
> > MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
> >
> > Defining this middle part as a variable was rejected on the basis that
> > users can pass the whole MODLIB to make, such as
> 
> 
> In other words, do you want to say
> 
> "If defining this middle part as a variable had been accepted,
> this patch would have been unneeded." ?

If it were accepted I would not have to guess what the middle part is,
and could use the variable that unambiguosly defines it instead.

Thanks

Michal

> 
> 
> If your original patch were accepted, how would this patch look like?
> 
> kernel.spec needs to know the module directory somehow.
> 
> 
> Would you add the following in scripts/package/mkspec ?
> 
> %define MODLIB $(pkg-config --print-variables kmod 2>/dev/null | grep
> '^module_directory$' >/dev/null && pkg-config
> --variable=module_directory kmod || echo /lib/modules)
> 
> 
> 
> 
> 
> 
> 
> 
> >
> > make 'MODLIB=$(INSTALL_MOD_PATH)/usr/lib/modules/$(KERNELRELEASE)'
> >
> > However, this middle part of MODLIB is independently hardcoded by
> > rpm-pkg, and when the user alters MODLIB this is not reflected when
> > building the package.
> >
> > Given that $(INSTALL_MOD_PATH) is overridden during the rpm package build
> > it is likely going to be empty. Then MODLIB can be passed to the rpm
> > package, and used in place of the whole
> > /usr/lib/modules/$(KERNELRELEASE) part.
> >
> > Signed-off-by: Michal Suchanek <msuchanek@...e.de>
> > ---
> >  scripts/package/kernel.spec | 8 ++++----
> >  scripts/package/mkspec      | 1 +
> >  2 files changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/scripts/package/kernel.spec b/scripts/package/kernel.spec
> > index 3eee0143e0c5..15f49c5077db 100644
> > --- a/scripts/package/kernel.spec
> > +++ b/scripts/package/kernel.spec
> > @@ -67,7 +67,7 @@ cp $(%{make} %{makeflags} -s image_name) %{buildroot}/boot/vmlinuz-%{KERNELRELEA
> >  %{make} %{makeflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
> >  cp System.map %{buildroot}/boot/System.map-%{KERNELRELEASE}
> >  cp .config %{buildroot}/boot/config-%{KERNELRELEASE}
> > -ln -fns /usr/src/kernels/%{KERNELRELEASE} %{buildroot}/lib/modules/%{KERNELRELEASE}/build
> > +ln -fns /usr/src/kernels/%{KERNELRELEASE} %{buildroot}%{MODLIB}/build
> >  %if %{with_devel}
> >  %{make} %{makeflags} run-command KBUILD_RUN_COMMAND='${srctree}/scripts/package/install-extmod-build %{buildroot}/usr/src/kernels/%{KERNELRELEASE}'
> >  %endif
> > @@ -98,8 +98,8 @@ fi
> >
> >  %files
> >  %defattr (-, root, root)
> > -/lib/modules/%{KERNELRELEASE}
> > -%exclude /lib/modules/%{KERNELRELEASE}/build
> > +%{MODLIB}
> > +%exclude %{MODLIB}/build
> >  /boot/*
> >
> >  %files headers
> > @@ -110,5 +110,5 @@ fi
> >  %files devel
> >  %defattr (-, root, root)
> >  /usr/src/kernels/%{KERNELRELEASE}
> > -/lib/modules/%{KERNELRELEASE}/build
> > +%{MODLIB}/build
> >  %endif
> > diff --git a/scripts/package/mkspec b/scripts/package/mkspec
> > index d41608efb747..d41b2e5304ac 100755
> > --- a/scripts/package/mkspec
> > +++ b/scripts/package/mkspec
> > @@ -18,6 +18,7 @@ fi
> >  cat<<EOF
> >  %define ARCH ${ARCH}
> >  %define KERNELRELEASE ${KERNELRELEASE}
> > +%define MODLIB ${MODLIB}
> >  %define pkg_release $("${srctree}/init/build-version")
> >  EOF
> >
> > --
> > 2.42.0
> >
> 
> 
> --
> Best Regards
> Masahiro Yamada