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kbuild: script to check for undefined Kconfig symbols

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To avoid having to look manually for used but undefined Kconfig variables,
I've written a script which tries do this efficiently, in case all other
attention fail.  It accounts for _MODULE suffix and for UML_ prefixes to
Kconfig variable, but otherwise looks for exact matches (i.e.  \<CONFIG_;
this is done to exclude macros like MMCONFIG_).

Undefined Kconfig variables should be not be removed without care, but for
instance arch/i386/boot/ uses a bunch of undefined Kconfig vars:

$ scripts/checkunknowndefines.sh arch/i386/boot/
arch/i386/boot/video.h uses undefined symbol VIDEO_400_HACK
arch/i386/boot/video-vga.c uses undefined symbol VIDEO_400_HACK
arch/i386/boot/video.c uses undefined symbol VIDEO_RETAIN
arch/i386/boot/video.h uses undefined symbol VIDEO_RETAIN
arch/i386/boot/video.h uses undefined symbol VIDEO_SVGA
arch/i386/boot/video.h uses undefined symbol VIDEO_VESA
arch/i386/boot/video-vesa.c uses undefined symbol VIDEO_VESA

It should also be mentioned in SubmittingPatches and SubmitChecklist.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2007-08-25 09:45:28 +02:00 committed by Sam Ravnborg
parent aa1e5ef5c1
commit 0bce67352b
1 changed files with 59 additions and 0 deletions
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59
scripts/checkkconfigsymbols.sh Executable file
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#!/bin/sh
# Find Kconfig variables used in source code but never defined in Kconfig
# Copyright (C) 2007, Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
# Tested with dash.
paths="$@"
[ -z "$paths" ] && paths=.
# Doing this once at the beginning saves a lot of time, on a cache-hot tree.
Kconfigs="`find . -name 'Kconfig' -o -name 'Kconfig*[^~]'`"
echo -e "File list \tundefined symbol used"
find $paths -name '*.[chS]' -o -name 'Makefile' -o -name 'Makefile*[^~]'| while read i
do
# Output the bare Kconfig variable and the filename; the _MODULE part at
# the end is not removed here (would need perl an not-hungry regexp for that).
sed -ne 's!^.*\<\(UML_\)\?CONFIG_\([0-9A-Z_]\+\).*!\2 '$i'!p' < $i
done | \
# Smart "sort|uniq" implemented in awk and tuned to collect the names of all
# files which use a given symbol
awk '{map[$1, count[$1]++] = $2; }
END {
for (combIdx in map) {
split(combIdx, separate, SUBSEP);
# The value may have been removed.
if (! ( (separate[1], separate[2]) in map ) )
continue;
symb=separate[1];
printf "%s ", symb;
#Use gawk extension to delete the names vector
delete names;
#Portably delete the names vector
#split("", names);
for (i=0; i < count[symb]; i++) {
names[map[symb, i]] = 1;
# Unfortunately, we may still encounter symb, i in the
# outside iteration.
delete map[symb, i];
}
i=0;
for (name in names) {
if (i > 0)
printf ", %s", name;
else
printf "%s", name;
i++;
}
printf "\n";
}
}' |
while read symb files; do
# Remove the _MODULE suffix when checking the variable name. This should
# be done only on tristate symbols, actually, but Kconfig parsing is
# beyond the purpose of this script.
symb_bare=`echo $symb | sed -e 's/_MODULE//'`
if ! grep -q "\<$symb_bare\>" $Kconfigs; then
echo -e "$files: \t$symb"
fi
done|sort