1#!/bin/bash
 2# SPDX-License-Identifier: GPL-2.0-only
 3# Translate the bits making up a GFP mask
 4# (c) 2009, Mel Gorman <mel@csn.ul.ie>
 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

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0-only
  3# Translate the bits making up a GFP mask
  4# (c) 2009, Mel Gorman <mel@csn.ul.ie>
  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.c` || exit 1
 66
 
 
 
 
 
 
 
 
 
 67echo Source: $SOURCE
 68echo Parsing: $GFPMASK
 
 
 
 
 
 
 69
 70(
 71    cat <<EOF
 72#include <stdint.h>
 73#include <stdio.h>
 74
 75// Try to fool compiler.h into not including extra stuff
 76#define __ASSEMBLY__	1
 77
 78#include <generated/autoconf.h>
 79#include <linux/gfp_types.h>
 80
 81static const char *masks[] = {
 82EOF
 83
 84    sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\1/p' $SOURCE/include/linux/gfp_types.h |
 85	while read b; do
 86	    cat <<EOF
 87#if defined($b) && ($b > 0)
 88	[${b}_BIT]	= "$b",
 89#endif
 90EOF
 91	done
 92
 93    cat <<EOF
 94};
 95
 96int main(int argc, char *argv[])
 97{
 98	unsigned long long mask = $GFPMASK;
 99
100	for (int i = 0; i < sizeof(mask) * 8; i++) {
101		unsigned long long bit = 1ULL << i;
102		if (mask & bit)
103			printf("\t%-25s0x%llx\n",
104			       (i < ___GFP_LAST_BIT && masks[i]) ?
105					masks[i] : "*** INVALID ***",
106			       bit);
107	}
108
109	return 0;
110}
111EOF
112) > $TMPFILE
113
114${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin
115
116rm -f $TMPFILE ${TMPFILE}.bin
117
118exit 0