scripts/gfp-translate

   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.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