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Message-Id: <20070824090325.84e6cf7e.randy.dunlap@oracle.com>
Date: Fri, 24 Aug 2007 09:03:25 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: "Paolo 'Blaisorblade' Giarrusso" <blaisorblade@...oo.it>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, rpjday@...dspring.com
Subject: Re: [PATCH] Script to check for undefined Kconfig symbols - v2
On Fri, 24 Aug 2007 16:56:49 +0200 Paolo 'Blaisorblade' Giarrusso wrote:
> In this version, I've updated the scripts to search for "\<$symb_bare\>" instead
> of $symb_bare in Kconfig files. Please ignore my previous message.
>
> To avoid 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
>
> Hope you can merge this in -mm and use it frequently (probably, a script to look for
> regressions in its output is useful). It should also be mentioned in
> SubmittingPatches if you agree.
or added to Documentation/SubmitChecklist.
How does this script compare to
http://www.fsdev.net/wiki/index.php?title=Misspelled_CONFIG_variables
and
http://www.fsdev.net/wiki/index.php?title=Dead_CONFIG_variables
?
> Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
> ---
>
> scripts/checkunknowndefines.sh | 59 ++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 59 insertions(+), 0 deletions(-)
>
> diff --git a/scripts/checkunknowndefines.sh b/scripts/checkunknowndefines.sh
> new file mode 100755
> index 0000000..dbb5cef
> --- /dev/null
> +++ b/scripts/checkunknowndefines.sh
> @@ -0,0 +1,59 @@
> +#!/bin/sh
> +# Find Kconfig variables used in source code but never defined in Kconfig
> +# Copyright (C) 2007, Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.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 "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\>" $Kconfigs; then
> + echo "$files: \t$symb"
> + fi
> +done|sort
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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