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> 5SOURCE= 6GFPMASK=none 7 8# Helper function to report failures and exit 9die() { 10 echo ERROR: $@ 11 if [ "$TMPFILE" != "" ]; then 12 rm -f $TMPFILE 13 fi 14 exit -1 15} 16 17usage() { 18 echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask" 19 exit 0 20} 21 22# Parse command-line arguments 23while [ $# -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=$1 37 shift 38 ;; 39 esac 40done 41 42# Guess the kernel source directory if it's not set. Preference is in order of 43# o current directory 44# o /usr/src/linux 45if [ "$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 52fi 53 54# Confirm that a source directory exists 55if [ ! -r "$SOURCE/Makefile" ]; then 56 die "Could not locate kernel source directory or it is invalid" 57fi 58 59# Confirm that a GFP mask has been specified 60if [ "$GFPMASK" = "none" ]; then 61 usage 62fi 63 64# Extract GFP flags from the kernel source 65TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || exit 1 66 67echo Source: $SOURCE 68echo Parsing: $GFPMASK 69 70( 71 cat <<EOF 72#include <stdint.h> 73#include <stdio.h> 74 75// Try to fool compiler.h into not including extra stuff 76#define __ASSEMBLY__ 1 77 78#include <generated/autoconf.h> 79#include <linux/gfp_types.h> 80 81static const char *masks[] = { 82EOF 83 84 sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\1/p' $SOURCE/include/linux/gfp_types.h | 85 while read b; do 86 cat <<EOF 87#if defined($b) && ($b > 0) 88 [${b}_BIT] = "$b", 89#endif 90EOF 91 done 92 93 cat <<EOF 94}; 95 96int main(int argc, char *argv[]) 97{ 98 unsigned long long mask = $GFPMASK; 99 100 for (int i = 0; i < sizeof(mask) * 8; i++) { 101 unsigned long long bit = 1ULL << i; 102 if (mask & bit) 103 printf("\t%-25s0x%llx\n", 104 (i < ___GFP_LAST_BIT && masks[i]) ? 105 masks[i] : "*** INVALID ***", 106 bit); 107 } 108 109 return 0; 110} 111EOF 112) > $TMPFILE 113 114${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin 115 116rm -f $TMPFILE ${TMPFILE}.bin 117 118exit 0 119