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kpatch-build: consider CONFIG_PARAVIRT optional 

CONFIG_PARAVIRT is not required for building kpatch patch modules.  The
sizeof paravirt_patch_site struct was only needed to create
.parainstructions sections as part of create-diff-object.  As long as
the original objects were built without such sections then
this kernel option (and struct handling) can be considered optional.
This commit is contained in:
Joe Lawrence 2017-02-08 17:02:12 -05:00
parent 3b2c372d81
commit 337965ad71
1 changed files with 15 additions and 6 deletions
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21
kpatch-build/kpatch-build
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@ -505,6 +505,13 @@ else
KBUILD_EXTRA_SYMBOLS="$SYMVERSFILE"
fi
# optional kernel configs: CONFIG_PARAVIRT
if grep "CONFIG_PARAVIRT=y" "$OBJDIR/.config" > /dev/null; then
CONFIG_PARAVIRT=1
else
CONFIG_PARAVIRT=0
fi
# unsupported kernel option checking: CONFIG_DEBUG_INFO_SPLIT
grep -q "CONFIG_DEBUG_INFO_SPLIT=y" "$OBJDIR/.config" && die "kernel option 'CONFIG_DEBUG_INFO_SPLIT' not supported"
@ -516,8 +523,9 @@ cp -LR "$DATADIR/patch" "$TEMPDIR" || die
export KCFLAGS="-I$DATADIR/patch -ffunction-sections -fdata-sections"
echo "Reading special section data"
[[ $CONFIG_PARAVIRT -eq 0 ]] && AWK_OPTIONS="-vskip_p=1"
SPECIAL_VARS=$(readelf -wi "$VMLINUX" |
gawk --non-decimal-data '
gawk --non-decimal-data $AWK_OPTIONS '
BEGIN { a = b = p = e = 0 }
# Set state if name matches
@ -539,14 +547,15 @@ SPECIAL_VARS=$(readelf -wi "$VMLINUX" |
e == 1 {printf("export EX_STRUCT_SIZE=%d\n", $4); e = 2}
# Bail out once we have everything
a == 2 && b == 2 && p == 2 && e == 2 {exit}')
a == 2 && b == 2 && (p == 2 || skip_p) && e == 2 {exit}')
[[ -n $SPECIAL_VARS ]] && eval "$SPECIAL_VARS"
if [[ -z $ALT_STRUCT_SIZE ]] || [[ -z $BUG_STRUCT_SIZE ]] ||
[[ -z $PARA_STRUCT_SIZE ]] || [[ -z $EX_STRUCT_SIZE ]]; then
die "can't find special struct size"
fi
[[ -z $ALT_STRUCT_SIZE ]] && die "can't find special struct alt_instr size"
[[ -z $BUG_STRUCT_SIZE ]] && die "can't find special struct bug_entry size"
[[ -z $EX_STRUCT_SIZE ]] && die "can't find special struct paravirt_patch_site size"
[[ -z $PARA_STRUCT_SIZE && $CONFIG_PARAVIRT -ne 0 ]] && die "can't find special struct paravirt_patch_site size"
for i in $ALT_STRUCT_SIZE $BUG_STRUCT_SIZE $PARA_STRUCT_SIZE $EX_STRUCT_SIZE; do
if [[ ! $i -gt 0 ]] || [[ ! $i -le 16 ]]; then
die "invalid special struct size $i"