FreeBSD/Linux Kernel Cross Reference
sys/scripts/gfp-translate

     #!/bin/bash
     # Translate the bits making up a GFP mask
     # (c) 2009, Mel Gorman <mel@csn.ul.ie>
     # Licensed under the terms of the GNU GPL License version 2
     SOURCE=
     GFPMASK=none
     
     # Helper function to report failures and exit
     die() {
            echo ERROR: $@
            if [ "$TMPFILE" != "" ]; then
                    rm -f $TMPFILE
            fi
            exit -1
    }
    
    usage() {
            echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask"
            exit 0
    }
    
    # Parse command-line arguments
    while [ $# -gt 0 ]; do
            case $1 in
                    --source)
                            SOURCE=$2
                            shift 2
                            ;;
                    -h)
                            usage
                            ;;
                    --help)
                            usage
                            ;;
                    *)
                            GFPMASK=$1
                            shift
                            ;;
            esac
    done
    
    # Guess the kernel source directory if it's not set. Preference is in order of
    # o current directory
    # o /usr/src/linux
    if [ "$SOURCE" = "" ]; then
            if [ -r "/usr/src/linux/Makefile" ]; then
                    SOURCE=/usr/src/linux
            fi
            if [ -r "`pwd`/Makefile" ]; then
                    SOURCE=`pwd`
            fi
    fi
    
    # Confirm that a source directory exists
    if [ ! -r "$SOURCE/Makefile" ]; then
            die "Could not locate kernel source directory or it is invalid"
    fi
    
    # Confirm that a GFP mask has been specified
    if [ "$GFPMASK" = "none" ]; then
            usage
    fi
    
    # Extract GFP flags from the kernel source
    TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1
    grep -q ___GFP $SOURCE/include/linux/gfp.h
    if [ $? -eq 0 ]; then
            grep "^#define ___GFP" $SOURCE/include/linux/gfp.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
    else
            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
    fi
    
    # Parse the flags
    IFS="
    "
    echo Source: $SOURCE
    echo Parsing: $GFPMASK
    for LINE in `cat $TMPFILE`; do
            MASK=`echo $LINE | awk '{print $3}'`
            if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
                    echo $LINE
            fi
    done
    
    rm -f $TMPFILE
    exit 0

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