Root/scripts/gfp-translate

Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 9 years 4 months ago.
By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing
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
87

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