linux-kernel - Re: [PATCH 1/1] kbuild: recursive build of external kernel modules

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Date:   Mon, 12 Aug 2019 12:34:30 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Shaun Tancheff <stancheff@...y.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        Jonathan Corbet <corbet@....net>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Renninger <trenn@...e.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM mailing list <linux-pm@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/1] kbuild: recursive build of external kernel modules

On Mon, Aug 12, 2019 at 10:24 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> On Fri, Aug 9, 2019 at 9:21 AM Shaun Tancheff <shaun@...cheff.com> wrote:
> >
> > When building a tree of external modules stage 2 fails
> > silently as the root modules.order is empty.
> >
> > Modify the modules.order location to be fixed to the
> > root when KBUILD_EXTMOD is specified and write all
> > module paths to the single modules.order file.
>
> Could you try v5.3-rc4 please?

So it seems we are using 'subdir-m' but that is now gone?

Is there a recommend pattern for backward compatibility?

Thanks!
>
> > Signed-off-by: Shaun Tancheff <stancheff@...y.com>
> > ---
> >  Makefile               | 1 +
> >  scripts/Makefile.build | 8 +++++++-
> >  2 files changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 23cdf1f41364..a9964492f47e 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -1622,6 +1622,7 @@ $(module-dirs): prepare $(objtree)/Module.symvers
> >
> >  modules: $(module-dirs)
> >         @$(kecho) '  Building modules, stage 2.';
> > +       $(Q)$rm -f $(KBUILD_EXTMOD)/modules.order
> >         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
> >
> >  PHONY += modules_install
> > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > index 0d434d0afc0b..f9908b3d59e0 100644
> > --- a/scripts/Makefile.build
> > +++ b/scripts/Makefile.build
> > @@ -64,7 +64,13 @@ builtin-target := $(obj)/built-in.a
> >  endif
> >
> >  ifeq ($(CONFIG_MODULES)$(need-modorder),y1)
> > +ifneq ($(KBUILD_EXTMOD),)
> > +modorder-target := $(KBUILD_EXTMOD)/modules.order
> > +modorder-add := >>
> > +else
> >  modorder-target := $(obj)/modules.order
> > +modorder-add := >
> > +endif
> >  endif
> >
> >  mod-targets := $(patsubst %.o, %.mod, $(obj-m))
> > @@ -423,7 +429,7 @@ endif # builtin-target
> >  $(modorder-target): $(subdir-ym) FORCE
> >         $(Q){ $(foreach m, $(modorder), \
> >         $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
> > -       | $(AWK) '!x[$$0]++' - > $@
> > +       | $(AWK) '!x[$$0]++' - $(modorder-add) $@
> >
> >  #
> >  # Rule to compile a set of .o files into one .a file (with symbol table)
> > --
> > 2.20.1
> >
>
>
> --
> Best Regards
> Masahiro Yamada