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Without 'set -e', shell scripts continue running even after any
error occurs. The missed 'set -e' is a typical bug in shell scripting.
For example, when a disk space shortage occurs while this script is
running, it actually ends up with generating a truncated capflags.c.
Yet, mkcapflags.sh continues running and exits with 0. So, the build
system assumes it has succeeded.
It will not be re-generated in the next invocation of Make since its
timestamp is newer than that of any of the source files.
Add 'set -e' so that any error in this script is caught and propagated
to the build system.
Since 9c2af1c737 ("kbuild: add .DELETE_ON_ERROR special target"),
make automatically deletes the target on any failure. So, the broken
capflags.c will be deleted automatically.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20190625072622.17679-1-yamada.masahiro@socionext.com
68 lines
1.6 KiB
Bash
68 lines
1.6 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Generate the x86_cap/bug_flags[] arrays from include/asm/cpufeatures.h
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#
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set -e
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IN=$1
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OUT=$2
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dump_array()
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{
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ARRAY=$1
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SIZE=$2
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PFX=$3
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POSTFIX=$4
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PFX_SZ=$(echo $PFX | wc -c)
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TABS="$(printf '\t\t\t\t\t')"
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echo "const char * const $ARRAY[$SIZE] = {"
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# Iterate through any input lines starting with #define $PFX
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sed -n -e 's/\t/ /g' -e "s/^ *# *define *$PFX//p" $IN |
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while read i
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do
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# Name is everything up to the first whitespace
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NAME="$(echo "$i" | sed 's/ .*//')"
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# If the /* comment */ starts with a quote string, grab that.
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VALUE="$(echo "$i" | sed -n 's@.*/\* *\("[^"]*"\).*\*/@\1@p')"
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[ -z "$VALUE" ] && VALUE="\"$NAME\""
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[ "$VALUE" = '""' ] && continue
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# Name is uppercase, VALUE is all lowercase
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VALUE="$(echo "$VALUE" | tr A-Z a-z)"
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if [ -n "$POSTFIX" ]; then
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T=$(( $PFX_SZ + $(echo $POSTFIX | wc -c) + 2 ))
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TABS="$(printf '\t\t\t\t\t\t')"
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TABCOUNT=$(( ( 6*8 - ($T + 1) - $(echo "$NAME" | wc -c) ) / 8 ))
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printf "\t[%s - %s]%.*s = %s,\n" "$PFX$NAME" "$POSTFIX" "$TABCOUNT" "$TABS" "$VALUE"
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else
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TABCOUNT=$(( ( 5*8 - ($PFX_SZ + 1) - $(echo "$NAME" | wc -c) ) / 8 ))
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printf "\t[%s]%.*s = %s,\n" "$PFX$NAME" "$TABCOUNT" "$TABS" "$VALUE"
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fi
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done
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echo "};"
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}
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trap 'rm "$OUT"' EXIT
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(
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echo "#ifndef _ASM_X86_CPUFEATURES_H"
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echo "#include <asm/cpufeatures.h>"
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echo "#endif"
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echo ""
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dump_array "x86_cap_flags" "NCAPINTS*32" "X86_FEATURE_" ""
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echo ""
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dump_array "x86_bug_flags" "NBUGINTS*32" "X86_BUG_" "NCAPINTS*32"
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) > $OUT
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trap - EXIT
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