linux-kernel - Re: [PATCH 22/27] kbuild: generate a list of objects in vmlinux

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Date:   Thu, 28 Apr 2022 13:49:06 +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 22/27] kbuild: generate a list of objects in vmlinux

On Thu, Apr 28, 2022 at 11:56 AM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Mon 25 Apr 2022 04:08:06 GMT Masahiro Yamada wrote:
> > A *.mod file lists the member objects of a module, but vmlinux does
> > not have such a file to list out all the member objects.
> >
> > Generate this list to allow modpost to know all the member objects.
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/link-vmlinux.sh | 15 ++++++++++++++-
> >  1 file changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> > index 20f44504a644..d2c193f82004 100755
> > --- a/scripts/link-vmlinux.sh
> > +++ b/scripts/link-vmlinux.sh
> > @@ -310,7 +310,7 @@ cleanup()
> >       rm -f vmlinux
> >       rm -f vmlinux.map
> >       rm -f vmlinux.o
> > -     rm -f .vmlinux.d
> > +     rm -f .vmlinux*
>
> Wouldn't it be safer to keep the removal of .vmlinux.d for some time
> and just add .vmlinux.objs?  Somehow I do not like the wildcard here.

OK, will change in v2.


> >  }
> >
> >  # Use "make V=1" to debug this script
> > @@ -342,6 +342,19 @@ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
> >  modpost_link vmlinux.o
> >  objtool_link vmlinux.o
> >
> > +# Generate the list of objects in vmlinux
> > +rm -f .vmlinux.objs
> > +for f in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
> > +     case ${f} in
> > +     *.a)
> > +             ${AR} t ${f} >> .vmlinux.objs
> > +             ;;
> > +     *)
> > +             echo ${f} >> .vmlinux.objs
> > +             ;;
> > +     esac
> > +done
>
> just some bike shedding comment:  I would have left out the 'rm -f
> .vmlinux.objs' and moved the redirection to the end of the for loop:
>
> for f in ...
>     ...
>     ${AR}
>     echo
> done > .vmlinux.objs

OK, that would shorten the code a little.
Will do in v2.



>
> but it probably not worth.
>
> Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
>
> > +
> >  # modpost vmlinux.o to check for section mismatches
> >  ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
> >
> > --
> > 2.32.0
>
> --
> epost|xmpp: nicolas@...sle.eu          irc://oftc.net/nsc
> ↳ gpg: 18ed 52db e34f 860e e9fb  c82b 7d97 0932 55a0 ce7f
>      -- frykten for herren er opphav til kunnskap --



-- 
Best Regards
Masahiro Yamada