mirror of
https://github.com/torvalds/linux.git
synced 2024-11-13 23:51:39 +00:00
a3f6a89c83
Richard reports that since772dd03427("mm: enumerate all gfp flags"), gfp-translate is broken, as the bit numbers are implicit, leaving the shell script unable to extract them. Even more, some bits are now at a variable location, making it double extra hard to parse using a simple shell script. Use a brute-force approach to the problem by generating a small C stub that will use the enum to dump the interesting bits. As an added bonus, we are now able to identify invalid bits for a given configuration. As an added drawback, we cannot parse include files that predate this change anymore. Tough luck. Link: https://lkml.kernel.org/r/20240823163850.3791201-1-maz@kernel.org Fixes:772dd03427("mm: enumerate all gfp flags") Signed-off-by: Marc Zyngier <maz@kernel.org> Reported-by: Richard Weinberger <richard@nod.at> Cc: Petr Tesařík <petr@tesarici.cz> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
119 lines
2.1 KiB
Bash
Executable File
119 lines
2.1 KiB
Bash
Executable File
#!/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
|