6.10-stable review patch. If anyone has any objections, please let me know.
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From: Marc Zyngier maz@kernel.org
[ Upstream commit a3f6a89c834a4cba0f881da21307b26de3796133 ]
Richard reports that since 772dd0342727c ("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: 772dd0342727 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- scripts/gfp-translate | 66 ++++++++++++++++++++++++++++++++----------- 1 file changed, 49 insertions(+), 17 deletions(-)
diff --git a/scripts/gfp-translate b/scripts/gfp-translate index 6c9aed17cf56..8385ae0d5af9 100755 --- a/scripts/gfp-translate +++ b/scripts/gfp-translate @@ -62,25 +62,57 @@ if [ "$GFPMASK" = "none" ]; then fi
# Extract GFP flags from the kernel source -TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1 -grep -q ___GFP $SOURCE/include/linux/gfp_types.h -if [ $? -eq 0 ]; then - grep "^#define ___GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE -else - grep "^#define __GFP" $SOURCE/include/linux/gfp_types.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)//) //' > $TMPFILE -fi +TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || exit 1
-# 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 $TMPFILE +( + cat <<EOF +#include <stdint.h> +#include <stdio.h> + +// Try to fool compiler.h into not including extra stuff +#define __ASSEMBLY__ 1 + +#include <generated/autoconf.h> +#include <linux/gfp_types.h> + +static const char *masks[] = { +EOF + + sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\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