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Linux/scripts/gfp-translate

  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
  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.h
 67 if [ $? -eq 0 ]; then
 68         grep "^#define ___GFP" $SOURCE/include/linux/gfp.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
 69 else
 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
 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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