linux-kernel - Re: [PATCH] scripts/kconfig/merge_config: don't redefine 'y' to 'm'

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Date:   Tue, 6 Nov 2018 14:57:40 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dvhart@...radead.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] scripts/kconfig/merge_config: don't redefine 'y' to 'm'

On Mon, 5 Nov 2018 at 09:35, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> Hi Anders,
>
> On Fri, Nov 2, 2018 at 8:41 PM Anders Roxell <anders.roxell@...aro.org> wrote:
> >
> > In today's merge_config.sh the order of the config fragment files dictates
> > the output of a config option. With this approach we will get different
> > .config files depending on the order of the config fragment files.
> > Adding a switch to add precedence for builtin over modules, this will
> > make the .config file the same
> >
> > Suggested-by: Arnd Bergmann <arnd@...db.de>
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> > ---
>
> I think this patch makes sense.
>
> Just in case, could you please provide me the context of the discussion?

For instance we don't want to force X86 from DRM=y to DRM=m, when
enabling selftest, that would surely break somebody's setup and you also
don't want to force ARM64 from DRM=m to DRM=y, that seems
unnecessary for a big subsystem like DRM.

>
> Does the real problem exist in the kernel tree,

Not that I'm aware about.

Cheers,
Anders

> or for local fragment files?
>
>
> Thanks.
>
>
>
> >  scripts/kconfig/merge_config.sh | 15 ++++++++++++++-
> >  1 file changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
> > index da66e7742282..902a60b45614 100755
> > --- a/scripts/kconfig/merge_config.sh
> > +++ b/scripts/kconfig/merge_config.sh
> > @@ -32,6 +32,7 @@ usage() {
> >         echo "  -m    only merge the fragments, do not execute the make command"
> >         echo "  -n    use allnoconfig instead of alldefconfig"
> >         echo "  -r    list redundant entries when merging fragments"
> > +       echo "  -y    make builtin have precedence over modules"
> >         echo "  -O    dir to put generated output files.  Consider setting \$KCONFIG_CONFIG instead."
> >         echo
> >         echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
> > @@ -40,6 +41,7 @@ usage() {
> >  RUNMAKE=true
> >  ALLTARGET=alldefconfig
> >  WARNREDUN=false
> > +BUILTIN=false
> >  OUTPUT=.
> >  CONFIG_PREFIX=${CONFIG_-CONFIG_}
> >
> > @@ -64,6 +66,11 @@ while true; do
> >                 shift
> >                 continue
> >                 ;;
> > +       "-y")
> > +               BUILTIN=true
> > +               shift
> > +               continue
> > +               ;;
> >         "-O")
> >                 if [ -d $2 ];then
> >                         OUTPUT=$(echo $2 | sed 's/\/*$//')
> > @@ -122,7 +129,13 @@ for MERGE_FILE in $MERGE_LIST ; do
> >                 grep -q -w $CFG $TMP_FILE || continue
> >                 PREV_VAL=$(grep -w $CFG $TMP_FILE)
> >                 NEW_VAL=$(grep -w $CFG $MERGE_FILE)
> > -               if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
> > +               if test "$BUILTIN" = "true" && echo $PREV_VAL |grep -Eq '^\w+=y' && echo $NEW_VAL |grep -Eq '^\w+=m' ; then
> > +                       echo Value of $CFG is \'y\' and we don\'t want to redefine the fragment $MERGE_FILE:
> > +                       echo Previous  value: $PREV_VAL
> > +                       echo New value:       $NEW_VAL
> > +                       echo Will use previous value.
> > +                       echo
> > +               elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
> >                         echo Value of $CFG is redefined by fragment $MERGE_FILE:
> >                         echo Previous  value: $PREV_VAL
> >                         echo New value:       $NEW_VAL
> > --
> > 2.11.0
> >
>
>
> --
> Best Regards
> Masahiro Yamada