[PATCH 2/8] kconfig: merge_config.sh: sync with Linux v6.9

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

This gives us support for the new -s (strict mode) and -Q (disable
warnings) options. The latter will be used in the follow-up commit.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 scripts/kconfig/merge_config.sh | 40 +++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
index 63c8565206a4..902eb429b9db 100755
--- a/scripts/kconfig/merge_config.sh
+++ b/scripts/kconfig/merge_config.sh
@@ -28,6 +28,8 @@ usage() {
 	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 "  -s    strict mode. Fail if the fragment redefines any value."
+	echo "  -Q    disable warning messages for overridden options."
 	echo
 	echo "Used prefix: '$CONFIG_PREFIX'. You can redefine it with \$CONFIG_ environment variable."
 }
@@ -37,7 +39,9 @@ ALLTARGET=alldefconfig
 WARNREDUN=false
 BUILTIN=false
 OUTPUT=.
+STRICT=false
 CONFIG_PREFIX=${CONFIG_-CONFIG_}
+WARNOVERRIDE=echo
 
 while true; do
 	case $1 in
@@ -75,6 +79,16 @@ while true; do
 		shift 2
 		continue
 		;;
+	"-s")
+		STRICT=true
+		shift
+		continue
+		;;
+	"-Q")
+		WARNOVERRIDE=true
+		shift
+		continue
+		;;
 	*)
 		break
 		;;
@@ -131,18 +145,21 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 		NEW_VAL=$(grep -w $CFG $MERGE_FILE)
 		BUILTIN_FLAG=false
 		if [ "$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
+			${WARNOVERRIDE} Previous  value: $PREV_VAL
+			${WARNOVERRIDE} New value:       $NEW_VAL
+			${WARNOVERRIDE} -y passed, will not demote y to m
+			${WARNOVERRIDE}
 			BUILTIN_FLAG=true
 		elif [ "x$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
+			${WARNOVERRIDE} Value of $CFG is redefined by fragment $ORIG_MERGE_FILE:
+			${WARNOVERRIDE} Previous  value: $PREV_VAL
+			${WARNOVERRIDE} New value:       $NEW_VAL
+			${WARNOVERRIDE}
+			if [ "$STRICT" = "true" ]; then
+				STRICT_MODE_VIOLATED=true
+			fi
 		elif [ "$WARNREDUN" = "true" ]; then
-			echo Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
+			${WARNOVERRIDE} Value of $CFG is redundant by fragment $ORIG_MERGE_FILE:
 		fi
 		if [ "$BUILTIN_FLAG" = "false" ]; then
 			sed -i "/$CFG[ =]/d" $TMP_FILE
@@ -153,6 +170,11 @@ for ORIG_MERGE_FILE in $MERGE_LIST ; do
 	cat $MERGE_FILE >> $TMP_FILE
 done
 
+if [ "$STRICT_MODE_VIOLATED" = "true" ]; then
+	echo "The fragment redefined a value and strict mode had been passed."
+	exit 1
+fi
+
 if [ "$RUNMAKE" = "false" ]; then
 	cp -T -- "$TMP_FILE" "$KCONFIG_CONFIG"
 	echo "#"
-- 
2.39.2