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Documentation/features: Add script that refreshes the arch support status files in place

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Provides the script:

	Documentation/features/scripts/features-refresh.sh

which operates on the arch-support.txt files and refreshes them in place.

This way [1],

   "[...] we soft- decouple the refreshing of the entries from the
    introduction of the features, while still making it all easy to
    keep sync and to extend."

[1] http://lkml.kernel.org/r/20180328122211.GA25420@andrea

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Andrea Parri 2018-05-07 12:43:38 +02:00 committed by Jonathan Corbet
parent f6dbf65b65
commit be99f610a1
1 changed files with 98 additions and 0 deletions
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Documentation/features/scripts/features-refresh.sh Executable file
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#
# 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_FILE
done