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build objects in separate directory to fix caching

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Setting KCFLAGS="-ffunction-sections -fdata-sections" causes make to
invalidate all the kernel objects, resulting in all the objects getting
rebuilt on the next pass, thus no build caching.

To fix that, build the objects in a separate directory (obj) for normal
builds, and another separate directory (obj2) for the builds with added
cflags.
This commit is contained in:
Josh Poimboeuf 2014-02-20 14:52:21 -06:00
parent 4f64ad6c2a
commit 5352d8b01a
1 changed files with 33 additions and 24 deletions
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57
kpatch-build/kpatch-build
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@ -26,8 +26,10 @@ DISTROVERSION="${ARCHVERSION%*.*}"
CPUS="$(grep -c ^processor /proc/cpuinfo)"
LOCALVERSION="$(uname -r)"
LOCALVERSION="-${LOCALVERSION##*-}"
KSRCDIR="$HOME/.kpatch/$ARCHVERSION"
KSRCDIR_DIR="$(dirname $KSRCDIR)"
CACHEDIR="$HOME/.kpatch"
SRCDIR="$CACHEDIR/$ARCHVERSION/src"
OBJDIR="$CACHEDIR/$ARCHVERSION/obj"
OBJDIR2="$CACHEDIR/$ARCHVERSION/obj2"
TEMPDIR=
STRIPCMD="strip -d --keep-file-symbols"
APPLIEDPATCHFILE="applied-patch"
@ -73,14 +75,13 @@ TEMPDIR="$(mktemp -d)" || die "mktemp failed"
trap "rm -rf $TEMPDIR" EXIT INT TERM
if [[ -d "$KSRCDIR" ]]; then
echo "Using cache at $KSRCDIR"
cd "$KSRCDIR" || die
if [[ -d "$SRCDIR" ]]; then
echo "Using cache at $SRCDIR"
cd "$SRCDIR" || die
if [[ -f "$APPLIEDPATCHFILE" ]]; then
patch -R -p1 < "$APPLIEDPATCHFILE" || die "the kpatch cache is corrupted. \"rm -rf $KSRCDIR\" and try again"
patch -R -p1 < "$APPLIEDPATCHFILE" >> "$LOGFILE" 2>&1 || die "the kpatch cache is corrupted. \"rm -rf $CACHEDIR\" and try again"
rm -f "$APPLIEDPATCHFILE"
fi
make "-j$CPUS" vmlinux >> "$LOGFILE" 2>&1 || die
else
rpm -q --quiet rpmdevtools || die "rpmdevtools not installed"
rpm -q --quiet yum-utils || die "yum-utils not installed"
@ -93,25 +94,28 @@ else
rpm -ivh "$TEMPDIR/kernel-$DISTROVERSION.src.rpm" >> "$LOGFILE" 2>&1 || die
rpmbuild -bp "--target=$(uname -m)" "$HOME/rpmbuild/SPECS/kernel.spec" >> "$LOGFILE" 2>&1 ||
die "rpmbuild -bp failed. you may need to run 'yum-builddep kernel' first."
rm -rf "$KSRCDIR_DIR"
mkdir -p "$KSRCDIR_DIR"
mv "$HOME"/rpmbuild/BUILD/kernel-*/linux-"$ARCHVERSION" "$KSRCDIR" >> "$LOGFILE" 2>&1 || die
rm -rf "$CACHEDIR"
mkdir -p "$OBJDIR"
mv "$HOME"/rpmbuild/BUILD/kernel-*/linux-"$ARCHVERSION" "$SRCDIR" >> "$LOGFILE" 2>&1 || die
echo "Building original kernel"
cd "$KSRCDIR"
echo "$LOCALVERSION" > localversion || die
make "-j$CPUS" vmlinux >> "$LOGFILE" 2>&1 || die
cd "$SRCDIR"
cp .config "$OBJDIR" || die
echo "$LOCALVERSION" > "$OBJDIR/localversion" || die
fi
echo "Building original kernel"
make mrproper >> "$LOGFILE" 2>&1 || die
make "-j$CPUS" vmlinux "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
find_data_dir || (echo "can't find data dir" >&2 && die)
cp -LR "$DATADIR/patch" "$TEMPDIR" || die
cp vmlinux "$TEMPDIR" || die
cp "$OBJDIR/vmlinux" "$TEMPDIR" || die
echo "Building patched kernel"
cp "$PATCHFILE" "$APPLIEDPATCHFILE" || die
patch -p1 < "$APPLIEDPATCHFILE" >> "$LOGFILE" 2>&1 || die
make "-j$CPUS" vmlinux > "$TEMPDIR/patched_build.log" 2>&1 || die
make "-j$CPUS" vmlinux "O=$OBJDIR" > "$TEMPDIR/patched_build.log" 2>&1 || die
echo "Detecting changed objects"
grep CC "$TEMPDIR/patched_build.log" | grep -v init/version.o | awk '{print $2}' >> "$TEMPDIR/changed_objs"
@ -121,13 +125,15 @@ if [[ $? -ne 0 ]]; then
fi
echo "Rebuilding changed objects"
rm -rf "$OBJDIR2"
mkdir -p "$OBJDIR2"
cp "$OBJDIR/.config" "$OBJDIR2" || die
mkdir "$TEMPDIR/patched"
for i in $(cat $TEMPDIR/changed_objs); do
rm -f "$i"
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" >> "$LOGFILE" 2>&1 || die
$STRIPCMD "$i" >> "$LOGFILE" 2>&1 || die
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" "O=$OBJDIR2" >> "$LOGFILE" 2>&1 || die
$STRIPCMD "$OBJDIR2/$i" >> "$LOGFILE" 2>&1 || die
mkdir -p "$TEMPDIR/patched/$(dirname $i)"
cp -f "$i" "$TEMPDIR/patched/$i" || die
cp -f "$OBJDIR2/$i" "$TEMPDIR/patched/$i" || die
done
patch -R -p1 < "$APPLIEDPATCHFILE" >> "$LOGFILE" 2>&1
@ -135,10 +141,10 @@ rm -f "$APPLIEDPATCHFILE"
mkdir "$TEMPDIR/orig"
for i in $(cat $TEMPDIR/changed_objs); do
rm -f "$i"
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" >> "$LOGFILE" 2>&1 || die
$STRIPCMD -d "$i" >> "$LOGFILE" 2>&1 || die
KCFLAGS="-ffunction-sections -fdata-sections" make "$i" "O=$OBJDIR2" >> "$LOGFILE" 2>&1 || die
$STRIPCMD -d "$OBJDIR2/$i" >> "$LOGFILE" 2>&1 || die
mkdir -p "$TEMPDIR/orig/$(dirname $i)"
cp -f "$i" "$TEMPDIR/orig/$i" || die
cp -f "$OBJDIR2/$i" "$TEMPDIR/orig/$i" || die
done
echo "Extracting new and modified ELF sections"
@ -152,11 +158,14 @@ for i in $FILES; do
done
echo "Building patch module: kpatch-$PATCHNAME.ko"
cp "$OBJDIR/.config" "$SRCDIR"
cd "$SRCDIR"
make prepare >> "$LOGFILE" 2>&1 || die
cd "$TEMPDIR/output"
ld -r -o ../patch/output.o $FILES >> "$LOGFILE" 2>&1 || die
cd "$TEMPDIR/patch"
"$TOOLSDIR"/add-patches-section output.o ../vmlinux >> "$LOGFILE" 2>&1 || die
KPATCH_BUILD="$KSRCDIR" KPATCH_NAME="$PATCHNAME" make >> "$LOGFILE" 2>&1 || die
KPATCH_BUILD="$SRCDIR" KPATCH_NAME="$PATCHNAME" make "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
$STRIPCMD "kpatch-$PATCHNAME.ko" >> "$LOGFILE" 2>&1 || die
"$TOOLSDIR"/link-vmlinux-syms "kpatch-$PATCHNAME.ko" ../vmlinux >> "$LOGFILE" 2>&1 || die