linux-kernel - Re: [PATCH 26/27] kbuild: stop generating *.symversions

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Date:   Thu, 28 Apr 2022 13:46:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nicolas Schier <nicolas@...sle.eu>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH 26/27] kbuild: stop generating *.symversions

On Thu, Apr 28, 2022 at 12:15 PM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Mon 25 Apr 2022 04:08:10 GMT Masahiro Yamada wrote:
> > Now *.symversions is unneeded. Clean up the Makefile and script.
> >
> > I will keep *.symversions in .gitignore and 'make clean' for a while
> > to avoid flooding the output from 'git status'.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/Makefile.build  | 28 ++++------------------------
> >  scripts/link-vmlinux.sh | 19 -------------------
> >  2 files changed, 4 insertions(+), 43 deletions(-)
> >
> > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > index aadc16e04632..7f199b0a5170 100644
> > --- a/scripts/Makefile.build
> > +++ b/scripts/Makefile.build
> > @@ -170,12 +170,9 @@ ifdef CONFIG_MODVERSIONS
> >  # to the kernel and/or modules at the end.
> >  gen_symversions =                                                            \
> >       if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then                       \
> > -             $(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
> > -                 > $@...mversions;                                           \
> >               echo >> $(dot-target).cmd ;                                     \
> > -             sed 's/\(.*\) = \(.*\);/$(pound)\1=\2/' $@...mversions >> $(dot-target).cmd ; \
> > -     else                                                                    \
> > -             rm -f $@...mversions;                                           \
> > +             $(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) | \
> > +             sed 's/\(.*\) = \(.*\);/$(pound)\1=\2/' >> $(dot-target).cmd ; \
>
> I was wondering, whether we should integrate the 'sed' part into
> genksyms and make it output the lines as we need them.
> If genksyms fails, we now don't see any error code and make will
> silently continue as the pipe hides genksyms' exit code, right?


You are right.
I was also thinking of doing this directly in genksyms.
I will do it in v2.

bash supports 'set -o pipefail', but I do not know how
to do it in other shells.

I am also thinking of switching over to SHELL=/bin/bash,
but we cannot rely on bash'ism here yet.

-- 
Best Regards
Masahiro Yamada