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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only
# Translate the bits making up a GFP mask
# (c) 2009, Mel Gorman <mel@csn.ul.ie>
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.c` || exit 1
echo Source: $SOURCE
echo Parsing: $GFPMASK
(
cat <<EOF
#include <stdint.h>
#include <stdio.h>
// Try to fool compiler.h into not including extra stuff
#define __ASSEMBLY__ 1
#include <generated/autoconf.h>
#include <linux/gfp_types.h>
static const char *masks[] = {
EOF
sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\1/p' $SOURCE/include/linux/gfp_types.h |
while read b; do
cat <<EOF
#if defined($b) && ($b > 0)
[${b}_BIT] = "$b",
#endif
EOF
done
cat <<EOF
};
int main(int argc, char *argv[])
{
unsigned long long mask = $GFPMASK;
for (int i = 0; i < sizeof(mask) * 8; i++) {
unsigned long long bit = 1ULL << i;
if (mask & bit)
printf("\t%-25s0x%llx\n",
(i < ___GFP_LAST_BIT && masks[i]) ?
masks[i] : "*** INVALID ***",
bit);
}
return 0;
}
EOF
) > $TMPFILE
${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin
rm -f $TMPFILE ${TMPFILE}.bin
exit 0
|
