#format wiki
#language nl
== Your Name ==
Roel Kluin

Email: [[MailTo(12o3l AT SPAMFREE tiscali DOT nl)]]
...

----
CategoryHomepage


some scripts for configuring a kernel:

To translate a module name (as listed in modprobe -l or modinfo -n ''module'') into a kernel .config option:
{{{
#!/bin/bash
mod="${1%.ko}";
dir="${1%/*}";
sed -e :a -e '/\\$/N; s/\\\n//; ta' "${dir#*/kernel/}/Makefile" | \
sed -n "s/^obj-\$(CONFIG_\([A-Z0-9_]*\))\W*+=\W*"${mod##*/}"\.o$/\1/p";
}}}

a sed script to check ioremap/iounmap balancing (can be adapted for others)

{{{
git-grep -l '[^[:alnum:]]ioremap' | while read g; do
echo "--------------------------[ $g ]--------------------------"
sed -n "/[^[:alnum:]]ioremap.*(\(.*\))/,/^[}{]$/{
s/\(.*return.*\)/\1\t\t-------return/
tp
s/\(.*goto.*\)/\1\t\t------goto/
tp
s/\(.*iounmap.*\)/\1\t\t<----/
tp
s/\(.*ioremap.*\)/\1\t\t---->/
Tp
=
:p
p
}" $g
done | less
}}}

scripts below may use these variables:
{{{
# a number
D="[0-9]\+"

# we could also use this, to match something like 1ul, floats or hexes as well:
# but the parentheses will cost one backreference for (git-)grep
d="\([0-9]\+[uUlLfF]\?\|[0-9]\+[uU]\?[lL][lL]\?\|0x[a-f0-9]\+\|0x[A-F0-9]\+\|[0-9]\+[lL][lL][uU]\|[0-9]*\.[0-9]\+[fF]\?\)"

# can be used for a variable/function name:
V="[A-Za-z_]\+[A-Za-z0-9_]*"

# capital: a config option/definition
K="[A-Z]\+[A-Z0-9_]*";

# works the same as above, but also for members and arrays: one backreference
W="$V\(\[$s$V$s\]\|\[$s$D$s\]\|\.$V\|->$V\)*"

# seperators:
s="[[:space:]]*";
S="[[:space:]]\+"

# useful to delimit a variable name:
Q="[^[:alnum:]_]"

# match the end of the line, including comments: one backreference (but at eol)
cendl="$s\(\/[\*\/].*\)\?$"

# match something that is not comment, string or character: 2 backreferences
ccode="\([^\/\"']*\|\/[^\*\/]\|\/\*\([^\*]*\|\**[^\/\*]\)*\*\/\|'[^']*'\|\"[^\"]*\"\)*"

# resp function open and end (only works when indentation is correct.
fo="^[\{]$cendl"
fe="^[\}]$cendl"

}}}

Make sure no-one is freeing skbs with kfree instead of kfree_skb
{{{
for f in $(git-grep -l "struct${s}sk_buff"); do
sed -n "s/^.*struct${S}sk_buff${s}\*${s}\(${V}\)$Q.*$/\1/p" $f | sort | uniq | while read n; do
sed -n "/struct${s}sk_buff${s}\*${s}${n}/,/^[{}].*$/{ /kfree(${s}${n}${s})/= }" $f | while read q; do
echo -e "kfreeing sk_buff $n at line $q in $f\n$q";
sed -n "/struct${s}sk_buff${s}\*${s}${n}/,/^[{}].*$/p" $f;
done
done
done 2>&1 | less
}}}

show module initializing functions, not using {{{__init}}} or similarly exit
{{{
git-grep -n "\(void\|int\)$s[[:alnum:]_]*module_[ei][xn]it(void)" | grep -v "__[ie][xn]it"
}}}

these can be replaced with strchr
{{{
E="\([^\"\\]\|\\[\\tnr\?'\"0bafv]\|\\[0-7]\{1,3\}\|\\[a-f0-9]\{1,2\}\)"
git-grep -n "strstr$s($s$W$s,$s\"$E\"$s)"
}}}

matches if(function) BUG()
{{{
cendl="$s\(\/[\*\/].*\)\?$"
ccode="\([^\/\"']*\|\/[^\*\/]\|\/\*\([^\*]*\|\**[^\/\*]\)*\*\/\|'[^']*'\|\"[^\"]*\"\)*"
q="${s}if$s(\($ccode$Q\)\?$L$s($ccode)$s$ccode$s)"
git-grep -n -B1 "^\($q\)\?${s}BUG($s)$s;$cendl" | grep "$q$cendl" |
grep -v "\(sizeof\|unlikely\|likely\)($ccode)" | less
}}}

Based on Linus' script to get the email address of a maintainer, I wrote this script
to get the address of a list rather than a maintainers address for mailing.

{{{
git log --since="1 year ago"  "$@" | sed -n "s/^    .[-a-z]*by: \(.*\) <.*$/\1/p" |
sort | uniq | sort -n -r | while read name; do
        sed -n "/^P:[ \t]*.*$name/,/^$/{
                s/^L:[ \t]*\(.*\)$/\1/p
        }" ./MAINTAINERS
done | sort | uniq -c | sort -n -r | while read nr list; do
        tot=`grep -c "^L:\W*.*$list.*" ./MAINTAINERS`
        echo "`expr $nr / \( $tot + 1 \)` $nr $tot $list"
done | sort -r | cut -d " " -f2- | while read nr tot list; do
        echo -e "$nr/$tot Acks were commited by maintainers of list $list"
done
}}}