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>
5 SOURCE=
6 GFPMASK=none
7
8 # Helper function to report failures and exit
9 die() {
10 echo ERROR: $@
11 if [ "$TMPFILE" != "" ]; then
12 rm -f $TMPFILE
13 fi
14 exit -1
15 }
16
17 usage() {
18 echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask"
19 exit 0
20 }
21
22 # Parse command-line arguments
23 while [ $# -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=$1
37 shift
38 ;;
39 esac
40 done
41
42 # Guess the kernel source directory if it's not set. Preference is in order of
43 # o current directory
44 # o /usr/src/linux
45 if [ "$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
52 fi
53
54 # Confirm that a source directory exists
55 if [ ! -r "$SOURCE/Makefile" ]; then
56 die "Could not locate kernel source directory or it is invalid"
57 fi
58
59 # Confirm that a GFP mask has been specified
60 if [ "$GFPMASK" = "none" ]; then
61 usage
62 fi
63
64 # Extract GFP flags from the kernel source
65 TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || exit 1
66
67 echo Source: $SOURCE
68 echo Parsing: $GFPMASK
69
70 (
71 cat <<EOF
72 #include <stdint.h>
73 #include <stdio.h>
74
75 // Try to fool compiler.h into not including extra stuff
76 #define __ASSEMBLY__ 1
77
78 #include <generated/autoconf.h>
79 #include <linux/gfp_types.h>
80
81 static const char *masks[] = {
82 EOF
83
84 sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\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
90 EOF
91 done
92
93 cat <<EOF
94 };
95
96 int 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 }
111 EOF
112 ) > $TMPFILE
113
114 ${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin
115
116 rm -f $TMPFILE ${TMPFILE}.bin
117
118 exit 0
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