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` || exit 1
66 grep -q ___GFP $SOURCE/include/linux/gfp_types.h
67 if [ $? -eq 0 ]; then
68 grep "^#define ___GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
69 else
70 grep "^#define __GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)\//) \//' > $TMPFILE
71 fi
72
73 # Parse the flags
74 IFS="
75 "
76 echo Source: $SOURCE
77 echo Parsing: $GFPMASK
78 for LINE in `cat $TMPFILE`; do
79 MASK=`echo $LINE | awk '{print $3}'`
80 if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
81 echo $LINE
82 fi
83 done
84
85 rm -f $TMPFILE
86 exit 0
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