linux-kernel - Re: [PATCH v2] scripts/kconfig/merge

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Date:   Sun, 11 Nov 2018 13:42:31 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     dvhart@...radead.org, Arnd Bergmann <arnd@...db.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] scripts/kconfig/merge_config: don't redefine 'y' to 'm'

On Fri, Nov 9, 2018 at 4:45 AM 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.
>
> So doing something like:
> $ ./merge/kconfig/merge_config.sh selftest.config drm.config
>
> Where selftest.config defines DRM=y and drm.config defines DRM=m, the
> result will be "DRM=m".
>
> Rework to add a switch to get builtin '=y' precedence over modules '=m',
> this will result in "DRM=y". If we do something like this:
>
> $ ./merge/kconfig/merge_config.sh -y selftest.config drm.config
>
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  scripts/kconfig/merge_config.sh | 34 +++++++++++++++++++++++++++------
>  1 file changed, 28 insertions(+), 6 deletions(-)
>
> diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
> index da66e7742282..fcd18f642fc7 100755
> --- a/scripts/kconfig/merge_config.sh
> +++ b/scripts/kconfig/merge_config.sh
> @@ -22,6 +22,7 @@
>
>  clean_up() {
>         rm -f $TMP_FILE
> +       rm -f $MERGE_FILE
>         exit
>  }
>  trap clean_up HUP INT TERM
> @@ -32,6 +33,7 @@ usage() {
>         echo "  -m    only merge the fragments, do not execute the make command"
>         echo "  -n    use allnoconfig instead of alldefconfig"
>         echo "  -r    list redundant entries when merging fragments"
> +       echo "  -y    make builtin have precedence over modules"
>         echo "  -O    dir to put generated output files.  Consider setting \$KCONFIG_CONFIG instead."
>         echo
>         echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
> @@ -40,6 +42,8 @@ usage() {
>  RUNMAKE=true
>  ALLTARGET=alldefconfig
>  WARNREDUN=false
> +BUILTIN=false
> +BUILTIN_FLAG=false


Could you move the initialization of BUILTIN_FLAG
into the inner for-loop ?



>  OUTPUT=.
>  CONFIG_PREFIX=${CONFIG_-CONFIG_}
>
> @@ -64,6 +68,11 @@ while true; do
>                 shift
>                 continue
>                 ;;
> +       "-y")
> +               BUILTIN=true
> +               shift
> +               continue
> +               ;;
>         "-O")
>                 if [ -d $2 ];then
>                         OUTPUT=$(echo $2 | sed 's/\/*$//')
> @@ -105,13 +114,15 @@ MERGE_LIST=$*
>  SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(${CONFIG_PREFIX}[a-zA-Z0-9_]*\)[= ].*/\2/p"
>
>  TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
> +MERGE_FILE=$(mktemp ./.merge_tmp.config.XXXXXXXXXX)
>
>  echo "Using $INITFILE as base"
>  cat $INITFILE > $TMP_FILE
>
>  # Merge files, printing warnings on overridden values
> -for MERGE_FILE in $MERGE_LIST ; do
> -       echo "Merging $MERGE_FILE"
> +for ORIG_MERGE_FILE in $MERGE_LIST ; do
> +       cat $ORIG_MERGE_FILE > $MERGE_FILE


This 'cat' should be moved after the check
of the presence of '$ORIG_MERGE_FILE'.


> +       echo "Merging $ORIG_MERGE_FILE"
>         if [ ! -r "$MERGE_FILE" ]; then

This check always returns false now.


>                 echo "The merge file '$MERGE_FILE' does not exist.  Exit." >&2
>                 exit 1
> @@ -122,15 +133,26 @@ 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)

Could you add 'BUILTIN_FLAG=false' here?



> -               if [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
> -                       echo Value of $CFG is redefined by fragment $MERGE_FILE:
> +               if [ "$BUILTIN" = "true" ] && [ "${NEW_VAL#CONFIG_*=}" = "m" ] && [ "${PREV_VAL#CONFIG_*=}" = "y" ]; then
> +                       echo Previous  value: $PREV_VAL
> +                       echo New value:       $NEW_VAL
> +                       echo -y passed, will not demote y to m
> +                       echo
> +                       BUILTIN_FLAG=true
> +               elif [ "x$PREV_VAL" != "x$NEW_VAL" ] ; then
> +                       echo Value of $CFG is redefined by fragment $ORIG_MERGE_FILE:
>                         echo Previous  value: $PREV_VAL
>                         echo New value:       $NEW_VAL
>                         echo
>                 elif [ "$WARNREDUN" = "true" ]; then
> -                       echo Value of $CFG is redundant by fragment $MERGE_FILE:
> +                       echo Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
> +               fi
> +               if [ "$BUILTIN_FLAG" = "false" ]; then
> +                       sed -i "/$CFG[ =]/d" $TMP_FILE
> +               else
> +                       sed -i "/$CFG[ =]/d" $MERGE_FILE
> +                       BUILTIN_FLAG=false


Then this 'BUILTIN_FLAG=false' can go away.

Thanks.


>                 fi
> -               sed -i "/$CFG[ =]/d" $TMP_FILE
>         done
>         cat $MERGE_FILE >> $TMP_FILE
>  done
> --
> 2.19.1
>


-- 
Best Regards
Masahiro Yamada