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

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Message-ID: <CADYN=9K8kfqMk3NL8BSecG=sAPOh26QffikMszV0H0ejSZrQkg@mail.gmail.com>
Date:   Thu, 8 Nov 2018 20:43:00 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     dvhart@...radead.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] scripts/kconfig/merge_config: don't redefine 'y' to 'm'

On Wed, 7 Nov 2018 at 20:36, Darren Hart <dvhart@...radead.org> wrote:
>
> On Fri, Nov 02, 2018 at 12:41:19PM +0100, Anders Roxell 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>
>
> Thanks for the patch Anders!
>
> > ---
> >  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 $NEW_VAL |grep -Eq '^\w+=m' ; then
>
> I think we can avoid the rather lengthy/forky "echo | grep" mechanism
> with POSIX substring parameter expansion (should work in bash, dash,
> etc.).
>
> http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
>
> We can also be more consistent with the other tests in the script, consider:
>
>                 if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
>
>
> > +                     echo Value of $CFG is \'y\' and we don\'t want to redefine the fragment $MERGE_FILE:
>
> I think we can drop the above and perhaps update the last line with...
>
> > +                     echo Previous  value: $PREV_VAL
> > +                     echo New value:       $NEW_VAL
> > +                     echo Will use previous value.
>
> echo "-y passed, will not demote y to m"
>
> Or something along those lines.

Thank you for your input, I'll update and send a v2 shortly.

Cheers,
Anders

>
> > +                     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
> >
> >
>
> --
> Darren Hart
> VMware Open Source Technology Center