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/scripts/gfp-translate

http://github.com/mirrors/linux
#! | 86 lines | 77 code | 9 blank | 0 comment | 0 complexity | e1244c47a0856980d9ed18d234a881d2 MD5 | raw file
 1#!/bin/bash
 2# Translate the bits making up a GFP mask
 3# (c) 2009, Mel Gorman <mel@csn.ul.ie>
 4# Licensed under the terms of the GNU GPL License version 2
 5SOURCE=
 6GFPMASK=none
 7
 8# Helper function to report failures and exit
 9die() {
10	echo ERROR: $@
11	if [ "$TMPFILE" != "" ]; then
12		rm -f $TMPFILE
13	fi
14	exit -1
15}
16
17usage() {
18	echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask"
19	exit 0
20}
21
22# Parse command-line arguments
23while [ $# -gt 0 ]; do
24	case $1 in
25		--source)
26			SOURCE=$2
27			shift 2
28			;;
29		-h)
30			usage
31			;;
32		--help)
33			usage
34			;;
35		*)
36			GFPMASK=$1
37			shift
38			;;
39	esac
40done
41
42# Guess the kernel source directory if it's not set. Preference is in order of
43# o current directory
44# o /usr/src/linux
45if [ "$SOURCE" = "" ]; then
46	if [ -r "/usr/src/linux/Makefile" ]; then
47		SOURCE=/usr/src/linux
48	fi
49	if [ -r "`pwd`/Makefile" ]; then
50		SOURCE=`pwd`
51	fi
52fi
53
54# Confirm that a source directory exists
55if [ ! -r "$SOURCE/Makefile" ]; then
56	die "Could not locate kernel source directory or it is invalid"
57fi
58
59# Confirm that a GFP mask has been specified
60if [ "$GFPMASK" = "none" ]; then
61	usage
62fi
63
64# Extract GFP flags from the kernel source
65TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1
66grep -q ___GFP $SOURCE/include/linux/gfp.h
67if [ $? -eq 0 ]; then
68	grep "^#define ___GFP" $SOURCE/include/linux/gfp.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
69else
70	grep "^#define __GFP" $SOURCE/include/linux/gfp.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)\//) \//' > $TMPFILE
71fi
72
73# Parse the flags
74IFS="
75"
76echo Source: $SOURCE
77echo Parsing: $GFPMASK
78for LINE in `cat $TMPFILE`; do
79	MASK=`echo $LINE | awk '{print $3}'`
80	if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
81		echo $LINE
82	fi
83done
84
85rm -f $TMPFILE
86exit 0