## Small script that refreshes the kernel feature support status in place.# for F_FILE in Documentation/features/*/*/arch-support.txt; do	F=$(grep "^#         Kconfig:" "$F_FILE" | cut -c26-) 	#	# Each feature F is identified by a pair (O, K), where 'O' can	# be either the empty string (for 'nop') or "not" (the logical	# negation operator '!'); other operators are not supported.	#	O=""	K=$F	if [[ "$F" == !* ]]; then		O="not"		K=$(echo $F | sed -e 's/^!//g')	fi 	#	# F := (O, K) is 'valid' iff there is a Kconfig file (for some	# arch) which contains K.	#	# Notice that this definition entails an 'asymmetry' between	# the case 'O = ""' and the case 'O = "not"'. E.g., F may be	# _invalid_ if:	#	# [case 'O = ""']	#   1) no arch provides support for F,	#   2) K does not exist (e.g., it was renamed/mis-typed);	#	# [case 'O = "not"']	#   3) all archs provide support for F,	#   4) as in (2).	#	# The rationale for adopting this definition (and, thus, for	# keeping the asymmetry) is:	#	#       We want to be able to 'detect' (2) (or (4)).	#	# (1) and (3) may further warn the developers about the fact	# that K can be removed.	#	F_VALID="false"	for ARCH_DIR in arch/*/; do		K_FILES=$(find $ARCH_DIR -name "Kconfig*")		K_GREP=$(grep "$K" $K_FILES)		if [ ! -z "$K_GREP" ]; then			F_VALID="true"			break		fi	done	if [ "$F_VALID" = "false" ]; then		printf "WARNING: '%s' is not a valid Kconfig\n" "$F"	fi 	T_FILE="$F_FILE.tmp"	grep "^#" $F_FILE > $T_FILE	echo "    -----------------------" >> $T_FILE	echo "    |         arch |status|" >> $T_FILE	echo "    -----------------------" >> $T_FILE	for ARCH_DIR in arch/*/; do		ARCH=$(echo $ARCH_DIR | sed -e 's/^arch//g' | sed -e 's/\///g')		K_FILES=$(find $ARCH_DIR -name "Kconfig*")		K_GREP=$(grep "$K" $K_FILES)		#		# Arch support status values for (O, K) are updated according		# to the following rules.		#		#   - ("", K) is 'supported by a given arch', if there is a		#     Kconfig file for that arch which contains K;		#		#   - ("not", K) is 'supported by a given arch', if there is		#     no Kconfig file for that arch which contains K;		#		#   - otherwise: preserve the previous status value (if any),		#                default to 'not yet supported'.		#		# Notice that, according these rules, invalid features may be		# updated/modified.		#		if [ "$O" = "" ] && [ ! -z "$K_GREP" ]; then			printf "    |%12s: |  ok  |\n" "$ARCH" >> $T_FILE		elif [ "$O" = "not" ] && [ -z "$K_GREP" ]; then			printf "    |%12s: |  ok  |\n" "$ARCH" >> $T_FILE		else			S=$(grep -v "^#" "$F_FILE" | grep " $ARCH:")			if [ ! -z "$S" ]; then				echo "$S" >> $T_FILE			else				printf "    |%12s: | TODO |\n" "$ARCH" \					>> $T_FILE			fi		fi	done	echo "    -----------------------" >> $T_FILE	mv $T_FILE $F_FILEdone