linux-kernel - Re: [PATCH v2 07/10] kbuild: get rid of duplication in the first line of *.mod files

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Date:   Wed, 6 Apr 2022 23:49:15 +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 v2 07/10] kbuild: get rid of duplication in the first line
 of *.mod files

On Wed, Apr 6, 2022 at 2:28 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Wed, Apr 6, 2022 at 5:16 AM Nicolas Schier <nicolas@...sle.eu> wrote:
> >
> > On Tue, Apr 05, 2022 at 08:33:55PM +0900 Masahiro Yamada wrote:
> > > The first line of *.mod lists the member objects of the module.
> > > This list may contain duplication if the same object is added multiple
> > > times, like this:
> > >
> > >   obj-m := foo.o
> > >   foo-$(CONFIG_FOO1_X) += foo1.o
> > >   foo-$(CONFIG_FOO1_Y) += foo1.o
> > >   foo-$(CONFIG_FOO2_X) += foo2.o
> > >   foo-$(CONFIG_FOO2_Y) += foo2.o
> > >
> > > This is probably not a big deal. As far as I know, the only small
> > > problem is scripts/mod/sumversion.c parses the same file over again.
> > > This can be avoided by adding $(sort ...). It has a side-effect that
> > > sorts the objects alphabetically, but it is not a big deal, either.
> > >
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> > >
> > > Changes in v2:
> > >   - new
> > >
> > >  scripts/Makefile.build | 4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > > index 3ef2373f0a57..63625877aeae 100644
> > > --- a/scripts/Makefile.build
> > > +++ b/scripts/Makefile.build
> > > @@ -307,8 +307,10 @@ $(obj)/%.prelink.o: $(obj)/%.o FORCE
> > >       $(call if_changed,cc_prelink_modules)
> > >  endif
> > >
> > > +multi-m-prereqs = $(sort $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)))
> > > +
> > >  cmd_mod = { \
> > > -     echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
> > > +     echo $(if $(multi-m-prereqs), $(multi-m-prereqs), $(@:.mod=.o)); \
> >
> > I'd rather expected to see $(or) here, too, as in commit 5c8166419acf ("kbuild:
> > replace $(if A,A,B) with $(or A,B)").
>
> Ah, good catch.
>
> I fixed it up locally.


I changed my mind.
I will throw away 07 and 08.

I will send different patches later.




>
> Thanks for the review.


-- 
Best Regards
Masahiro Yamada