X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=scripts%2Flttng-modules%2Fparam-build.sh;h=21e219cb33d2a30364312333d7b73a489dbe29ca;hb=77d2de479c2522ca159958e1dbb67a3bc794648a;hp=a905a38cb03ded5cd988639f3b8ca6c9343bcf1b;hpb=2c1d386a795ee93d8d8af91559e8b23ea036d82a;p=lttng-ci.git

diff --git a/scripts/lttng-modules/param-build.sh b/scripts/lttng-modules/param-build.sh
index a905a38..21e219c 100644
--- a/scripts/lttng-modules/param-build.sh
+++ b/scripts/lttng-modules/param-build.sh
@@ -1,6 +1,6 @@
-#!/bin/sh -exu
+#!/bin/bash -exu
 #
-# Copyright (C) 2016 - Michael Jeanson <mjeanson@efficios.com>
+# Copyright (C) 2016-2019 - Michael Jeanson <mjeanson@efficios.com>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,92 +15,640 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# Parameters
+arch=${arch:-}
+cross_arch=${cross_arch:-}
+ktag=${ktag:-}
+kgitrepo=${kgitrepo:-}
+mversion=${mversion:-}
+mgitrepo=${mgitrepo:-}
+
+
+## FUNCTIONS ##
+
 # Kernel version compare functions
 verlte() {
-    [  "$1" = "`printf '%s\n%s' $1 $2 | sort -V | head -n1`" ]
+    [  "$1" = "$(printf '%s\n%s' "$1" "$2" | sort -V | head -n1)" ]
 }
 
 verlt() {
-    [ "$1" = "$2" ] && return 1 || verlte $1 $2
+    [ "$1" = "$2" ] && return 1 || verlte "$1" "$2"
 }
 
 vergte() {
-    [  "$1" = "`printf '%s\n%s' $1 $2 | sort -V | tail -n1`" ]
+    [  "$1" = "$(printf '%s\n%s' "$1" "$2" | sort -V | tail -n1)" ]
 }
 
 vergt() {
-    [ "$1" = "$2" ] && return 1 || vergte $1 $2
+    [ "$1" = "$2" ] && return 1 || vergte "$1" "$2"
 }
 
-# Use all CPU cores
-NPROC=$(nproc)
 
-SRCDIR="${WORKSPACE}/lttng-modules"
-BUILDDIR="${WORKSPACE}/build"
-LNXSRCDIR="${WORKSPACE}/linux"
-LNXBUILDDIR="${WORKSPACE}/linux-build"
+git_clone_modules_sources() {
+    mkdir -p "$MODULES_GIT_DIR"
+    git clone --depth=1 -b "${mversion}" "${mgitrepo}" "$MODULES_GIT_DIR"
+}
 
-# Create build directory
-mkdir -p "${BUILDDIR}" "${LNXBUILDDIR}"
+# Checkout a shallow kernel tree of the specified tag
+git_clone_linux_sources() {
+    mkdir -p "$LINUX_GIT_DIR"
+    git clone --depth=1 -b "${ktag}" --reference "$LINUX_GIT_REF_REPO_DIR" "${kgitrepo}" "$LINUX_GIT_DIR"
+}
 
-# Enter linux source dir
-cd "${LNXSRCDIR}"
 
-# Prepare linux sources for modules OOT build
-make O="${LNXBUILDDIR}" defconfig
+# Export the kernel sources from the git repo
+git_export_linux_sources() {
+    cd "$LINUX_GIT_DIR"
+    git archive "${ktag}" | tar -x -C "$LINUX_SRCOBJ_DIR"
+}
 
-# Enable CONFIG_KALLSYMS_ALL
-sed -i "s/# CONFIG_KALLSYMS_ALL is not set/CONFIG_KALLSYMS_ALL=y/g" "${LNXBUILDDIR}"/.config
 
-# Build to out of tree dir
-make O="${LNXBUILDDIR}" modules_prepare
+# Upload the tar archive to the object store
+upload_archive_obj() {
+    s3cmd -c "$WORKSPACE/.s3cfg" put "$WORKSPACE/$obj_name" "$obj_url_prefix/"
+    rm -f "$WORKSPACE/$obj_name"
+}
 
-case "$kversion" in
-  Ubuntu*)
-    #fakeroot debian/rules clean
-    #fakeroot debian/rules genconfigs
-    #cp CONFIGS/amd64-config.flavour.generic .config
 
-    # Add Ubuntu ABI number to kernel headers, this is normally done by the packaging code
-    ABINUM=$(echo $kversion | grep -P -o 'Ubuntu-(lts-)?.*-\K\d+(?=\..*)')
-    echo "#define UTS_UBUNTU_RELEASE_ABI $ABINUM" >> ${LNXBUILDDIR}/include/generated/utsrelease.h
-    ;;
-esac
+extract_archive_obj() {
+    tar -xf "$WORKSPACE/$obj_name" -C "$LINUX_OBJ_DIR"
+    rm -f "$WORKSPACE/$obj_name"
+}
 
-# Get kernel version from source tree
-cd "${LNXBUILDDIR}"
-KVERSION=$(make kernelversion)
 
-# Enter source dir
-cd "${SRCDIR}"
+tar_archive_obj() {
+    cd "$LINUX_OBJ_DIR"
+    tar -cf "$WORKSPACE/$obj_name" -I pbzip2 .
+    cd -
+}
+
+# Find the most recent GCC version supported by the kernel sources
+select_compiler() {
+    local selected_cc
+
+    cd "$LINUX_SRCOBJ_DIR"
 
-# kernels 3.10 to 3.10.13 and 3.11 to 3.11.2 introduce a deadlock in the
-# timekeeping subsystem. We want those build to fail.
-if { vergte "$KVERSION" "3.10" && verlte "$KVERSION" "3.10.13"; } || \
-   { vergte "$KVERSION" "3.11" && verlte "$KVERSION" "3.11.2"; }; then
+    kversion=$(make -s kernelversion)
 
     set +e
 
-    # Build modules
-    KERNELDIR="${LNXBUILDDIR}" make -j${NPROC} V=1
+    for cc in gcc-5 gcc-4.8; do
+      if "${CROSS_COMPILE:-}${cc}" -I include/ -D__LINUX_COMPILER_H -D__LINUX_COMPILER_TYPES_H -E include/linux/compiler-gcc.h; then
+        selected_cc="$cc"
+        break
+      fi
+    done
+
+    set -e
+
+    if [ "x$selected_cc" = "x" ]; then
+      echo "Found no suitable compiler."
+      exit 1
+    fi
+
+    # Force gcc-4.8 for kernels before 3.18
+    if { verlt "$kversion" "3.18"; }; then
+      selected_cc=gcc-4.8
+    fi
+
+    if [ "$selected_cc" != "gcc-4.8" ]; then
+        # Older kernel Makefiles do not expect the compiler to default to PIE
+        KAFLAGS="-fno-pie"
+        KCFLAGS="-fno-pie -no-pie -fno-stack-protector"
+        KCPPFLAGS="-fno-pie"
+        export KAFLAGS KCFLAGS KCPPFLAGS
+    fi
+
+    export CC="${CROSS_COMPILE:-}${selected_cc}"
+    export HOSTCC="${selected_cc}"
+
+    cd -
+}
+
+
+build_linux_kernel() {
+    cd "$LINUX_SRCOBJ_DIR"
+
+    kversion=$(make -s kernelversion)
+
+    # Generate kernel configuration
+    case "$ktag" in
+      Ubuntu*)
+        if [ "${cross_arch}" = "powerpc" ]; then
+          if vergte "${kversion}" "4.10"; then
+            echo "Ubuntu removed big endian powerpc configuration from kernel >= 4.10. Don't try to build it."
+            exit 0
+          fi
+        fi
+        fakeroot debian/rules clean KW_DEFCONFIG_DIR=.
+        fakeroot debian/rules genconfigs KW_DEFCONFIG_DIR=.
+        cp CONFIGS/"${ubuntu_config}" .config
+        ;;
+
+      *)
+        # Force 32bit build on i386, default is 64bit
+        if [ "$arch" = "i386" ]; then
+            export ARCH="i386"
+        fi
+
+        # allyesconfig is mostly broken for kernels of the 2.6 series
+        if verlt "$kversion" "3.0"; then
+            vanilla_config="defconfig"
+        fi
+
+        make "${vanilla_config}"
+        ;;
+    esac
+
+    # oldnoconfig was renamed in 4.19
+    if vergte "$kversion" "4.19"; then
+        update_conf_target="olddefconfig"
+    else
+        update_conf_target="oldnoconfig"
+    fi
+
+    # Fix 'defined(@array)' was removed from recent perl
+    if [ -f "kernel/timeconst.pl" ]; then
+      sed -i 's/defined(\@\(.*\))/@\1/' kernel/timeconst.pl
+    fi
+
+    # Fix syntax of inline assembly which is confused with C++11 raw strings on gcc >= 5
+    if [ "$HOSTCC" != "gcc-4.8" ]; then
+      if [ -f "arch/x86/kvm/svm.c" ]; then
+        sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/svm.c
+      fi
+
+      if [ -f "arch/x86/kvm/vmx.c" ]; then
+        sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/vmx.c
+      fi
+    fi
+
+    # Newer binutils don't accept 3 operand 'cmp' instructions on ppc64
+    # Convert them to 'cmpw' which was previously done silently
+    if verlt "$kversion" "4.9"; then
+	    find arch/powerpc/ -name "*.S" -print0 | xargs -0 sed -i "s/\(cmp\)\(\s\+[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+\)/cmpw\2/"
+	    find arch/powerpc/ -name "*.S" -print0 | xargs -0 sed -i "s/\(cmpli\)\(\s\+[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+,\s*[a-zA-Z0-9]\+\)/cmplwi\2/"
+	    sed -i "s/\$pie \-o \"\$ofile\"/\$pie --no-dynamic-linker -o \"\$ofile\"/" arch/powerpc/boot/wrapper
+    fi
+
+    # Fix a typo in v2.6.36.x
+    if [ -f "arch/x86/kernel/entry_64.S" ]; then
+      sed -i 's/END(do_hypervisor_callback)/END(xen_do_hypervisor_callback)/' arch/x86/kernel/entry_64.S
+    fi
+
+    # Fix compiler switch in vdso Makefile for 2.6.36 to 2.6.36.2
+    if { vergte "$kversion" "2.6.36" && verlte "$kversion" "2.6.36.3"; }; then
+      sed -i 's/-m elf_x86_64/-m64/' arch/x86/vdso/Makefile
+      sed -i 's/-m elf_i386/-m32/' arch/x86/vdso/Makefile
+    fi
+
+    # Fix kernel < 3.0 with gcc >= 4.7
+    if verlt "$kversion" "3.0"; then
+      sed -i '/linux\/compiler.h/a #include <linux\/linkage.h> \/* For asmregparm *\/' arch/x86/include/asm/ptrace.h
+      sed -i 's/extern long syscall_trace_enter/extern asmregparm long syscall_trace_enter/' arch/x86/include/asm/ptrace.h
+      sed -i 's/extern void syscall_trace_leave/extern asmregparm void syscall_trace_leave/' arch/x86/include/asm/ptrace.h
+      echo "header-y += linkage.h" >> include/linux/Kbuild
+    fi
+
+    # GCC 4.8
+    if [ "$HOSTCC" == "gcc-4.8" ]; then
+      scripts/config --disable CONFIG_CC_STACKPROTECTOR_STRONG
+    fi
+
+    # Don't try to sign modules
+    scripts/config --disable CONFIG_MODULE_SIG
+
+    # Disable kernel stack frame correctness validation, introduced in 4.6.0 and currently fails
+    scripts/config --disable CONFIG_STACK_VALIDATION
+
+    # Cause problems with inline assembly on i386
+    scripts/config --disable CONFIG_DEBUG_SECTION_MISMATCH
+
+    # Don't build samples, they are broken on some kernel releases
+    scripts/config --disable CONFIG_SAMPLES
+    scripts/config --disable CONFIG_BUILD_DOCSRC
+
+    # Disable kcov
+    scripts/config --disable CONFIG_KCOV
+
+    # Broken on some RT kernels
+    scripts/config --disable CONFIG_HYPERV
+
+    # Broken drivers
+    scripts/config --disable CONFIG_RAPIDIO_TSI721
+    scripts/config --disable CONFIG_SGI_XP
+    scripts/config --disable CONFIG_MFD_WM8994
+    scripts/config --disable CONFIG_DRM_RADEON
+    scripts/config --disable CONFIG_SND_SOC_WM5100
+
+    # IGBVF won't build with recent gcc on 2.6.38.x
+    if { vergte "$kversion" "2.6.37" && verlt "$kversion" "2.6.38"; }; then
+      scripts/config --disable CONFIG_IGBVF
+    fi
+
+    # Set required options
+    scripts/config --enable CONFIG_TRACEPOINTS
+    scripts/config --enable CONFIG_KALLSYMS
+    scripts/config --enable CONFIG_HIGH_RES_TIMERS
+    scripts/config --enable CONFIG_KPROBES
+    scripts/config --enable CONFIG_FTRACE
+    scripts/config --enable CONFIG_BLK_DEV_IO_TRACE
+    scripts/config --enable CONFIG_KALLSYMS_ALL
+    scripts/config --enable CONFIG_HAVE_SYSCALL_TRACEPOINTS
+    scripts/config --enable CONFIG_PERF_EVENTS
+    scripts/config --enable CONFIG_EVENT_TRACING
+    scripts/config --enable CONFIG_KRETPROBES
+
+    # Debug
+    #cat .config
+
+    make "$update_conf_target" CC="$CC"
+    make -j"$NPROC" CC="$CC"
+
+    krelease=$(make -s kernelrelease CC="$CC")
+
+    # Save the kernel and modules
+    mkdir -p "$LINUX_INSTOBJ_DIR/boot"
+    make INSTALL_MOD_PATH="$LINUX_INSTOBJ_DIR" INSTALL_MOD_STRIP=1 modules_install CC="$CC"
+    make INSTALL_PATH="$LINUX_INSTOBJ_DIR/boot" install CC="$CC"
+    rm -f "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source" "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/build"
+    ln -s ../../../../sources "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source"
+    ln -s ../../../../sources "$LINUX_INSTOBJ_DIR/lib/modules/${krelease}/source"
+}
+
+
+extract_distro_headers() {
+
+    # Enter linux source dir
+    cd "${LINUX_SRCOBJ_DIR}"
+
+
+    # For RT kernels, copy version file
+    if [ -s localversion-rt ]; then
+        cp -a localversion-rt "${LINUX_HDROBJ_DIR}"
+    fi
+
+    # Copy all Makefile related stuff
+    find . -path './include/*' -prune \
+        -o -path './scripts/*' -prune -o -type f \
+        \( -name 'Makefile*' -o -name 'Kconfig*' -o -name 'Kbuild*' -o \
+            -name '*.sh' -o -name '*.pl' -o -name '*.lds' \) \
+        -print | cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
+
+    # Copy base scripts and include dirs
+    cp -a scripts include "${LINUX_HDROBJ_DIR}"
+
+    # Copy arch includes
+    (find arch -name include -type d -print0 | \
+        xargs -0 -n1 -i: find : -type f) | \
+        cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
+
+    # Copy arch scripts
+    (find arch -name scripts -type d -print0 | \
+        xargs -0 -n1 -i: find : -type f) | \
+        cpio -pd --preserve-modification-time "${LINUX_HDROBJ_DIR}"
+
+    # Cleanup scripts
+    rm -f "${LINUX_HDROBJ_DIR}/scripts/*.o"
+    rm -f "${LINUX_HDROBJ_DIR}/scripts/*/*.o"
+
+    # On powerpc this object is required to link modules
+    if [ "${karch}" = "powerpc" ]; then
+        cp -a --parents arch/powerpc/lib/crtsavres.[So] "${LINUX_HDROBJ_DIR}/"
+    fi
+
+    # On arm64 between 4.13 and 1.15 this object is required to build with ftrace support
+    if [ "${karch}" = "arm64" ]; then
+        if [ -f "arch/arm64/kernel/ftrace-mod.S" ]; then
+            cp -a --parents arch/arm64/kernel/ftrace-mod.[So] "${LINUX_HDROBJ_DIR}/"
+        fi
+    fi
+
+    # Newer kernels need objtool to build modules when CONFIG_STACK_VALIDATION=y
+    if [ -f tools/objtool/objtool ]; then
+      cp -a --parents tools/objtool/objtool "${LINUX_HDROBJ_DIR}/"
+    fi
+
+    if [ -f "arch/x86/kernel/macros.s" ]; then
+      cp -a --parents arch/x86/kernel/macros.s "${LINUX_HDROBJ_DIR}/"
+    fi
+
+    # Copy modules related stuff, if available
+    if [ -s Module.symvers ]; then
+        cp Module.symvers "${LINUX_HDROBJ_DIR}"
+    fi
+
+    if [ -s System.map ]; then
+        cp System.map "${LINUX_HDROBJ_DIR}"
+    fi
+
+    if [ -s Module.markers ]; then
+        cp Module.markers "${LINUX_HDROBJ_DIR}"
+    fi
+
+    # Copy config file
+    cp .config "${LINUX_HDROBJ_DIR}"
 
-    # We expect this build to fail, if it doesn't, fail the job.
-    if [ "$?" -eq 0 ]; then
+    # Make sure the Makefile and version.h have a matching timestamp so that
+    # external modules can be built
+    if [ -s "${LINUX_HDROBJ_DIR}/include/generated/uapi/linux/version.h" ]; then
+        touch -r "${LINUX_HDROBJ_DIR}/Makefile" "${LINUX_HDROBJ_DIR}/include/generated/uapi/linux/version.h"
+    elif [ -s "${LINUX_HDROBJ_DIR}/include/linux/version.h" ]; then
+        touch -r "${LINUX_HDROBJ_DIR}/Makefile" "${LINUX_HDROBJ_DIR}/include/linux/version.h"
+    else
+        echo "Missing version.h"
         exit 1
     fi
+    touch -r "${LINUX_HDROBJ_DIR}/.config" "${LINUX_HDROBJ_DIR}/include/generated/autoconf.h"
 
-    # We have to publish at least one file or the build will fail
-    echo "This kernel is broken, there is a deadlock in the timekeeping subsystem." > "${BUILDDIR}/BROKEN.txt"
+    # Copy .config to include/config/auto.conf so "make prepare" is unnecessary.
+    cp "${LINUX_HDROBJ_DIR}/.config" "${LINUX_HDROBJ_DIR}/include/config/auto.conf"
 
-    set -e
+    # Finally clean the object files from the full source tree
+    make clean
+
+    # And regen the modules support files
+    make modules_prepare CC="$CC"
+
+    # On powerpc this object is required to link modules
+    if [ "${karch}" = "powerpc" ]; then
+        make arch/powerpc/lib/crtsavres.o CC="$CC"
+    fi
+
+    # On arm64 between 4.13 and 4.15 this object is required to build with ftrace support
+    if [ "${karch}" = "arm64" ]; then
+        if [ -f "arch/arm64/kernel/ftrace-mod.S" ]; then
+            make arch/arm64/kernel/ftrace-mod.o CC="$CC"
+        fi
+    fi
+
+    # Version specific tasks
+    case "$ktag" in
+      Ubuntu*)
+        # Add Ubuntu ABI number to kernel headers, this is normally done by the packaging code
+        ABINUM="$(echo "$ktag" | grep -P -o 'Ubuntu-(lts-)?.*-\K\d+(?=\..*)')"
+        echo "#define UTS_UBUNTU_RELEASE_ABI $ABINUM" >> include/generated/utsrelease.h
+        echo "#define UTS_UBUNTU_RELEASE_ABI $ABINUM" >> "${LINUX_HDROBJ_DIR}/include/generated/utsrelease.h"
+        ;;
+    esac
+}
+
+
+build_modules() {
+
+    local kdir="$1"
+    local outdir="$2"
+    local kversion
+
+    kversion=$(make -C "$LINUX_HDROBJ_DIR" -s kernelversion)
+
+    # Enter lttng-modules source dir
+    cd "${MODULES_GIT_DIR}"
+
+    # kernels 3.10 to 3.10.13 and 3.11 to 3.11.2 introduce a deadlock in the
+    # timekeeping subsystem. We want those build to fail.
+    if { vergte "$kversion" "3.10" && verlte "$kversion" "3.10.13"; } || \
+       { vergte "$kversion" "3.11" && verlte "$kversion" "3.11.2"; }; then
+
+        set +e
+
+        # Build modules
+        KERNELDIR="${kdir}" make -j"${NPROC}" V=1 CC="$CC"
+	ret=$?
+
+        set -e
+
+        # We expect this build to fail, if it doesn't, fail the job.
+        if [ "$ret" -eq 0 ]; then
+            echo "This build should have failed."
+            exit 1
+        fi
+
+        # We have to publish at least one file or the build will fail
+        echo "This kernel is broken, there is a deadlock in the timekeeping subsystem." > "${outdir}/BROKEN.txt.ko"
+
+        KERNELDIR="${kdir}" make clean
+
+    else # Regular build
+
+        # Build modules against full kernel sources
+        KERNELDIR="${kdir}" make -j"${NPROC}" V=1 CC="$CC"
+
+        # Install modules to build dir
+        KERNELDIR="${kdir}" make INSTALL_MOD_PATH="${outdir}" modules_install
+
+        # Clean build dir
+        KERNELDIR="${kdir}" make clean
+    fi
+}
+
+
+## MAIN ##
+
+# Use all CPU cores
+NPROC=$(nproc)
+
+MODULES_GIT_DIR="${WORKSPACE}/src/lttng-modules"
+LINUX_GIT_DIR="${WORKSPACE}/src/linux"
+
+LINUX_OBJ_DIR="${WORKSPACE}/linux"
+LINUX_SRCOBJ_DIR="${LINUX_OBJ_DIR}/sources"
+LINUX_HDROBJ_DIR="${LINUX_OBJ_DIR}/headers"
+LINUX_INSTOBJ_DIR="${LINUX_OBJ_DIR}/install"
+
+MODULES_OUTPUT_KSRC_DIR="${WORKSPACE}/build/lttng-modules-ksrc"
+MODULES_OUTPUT_KHDR_DIR="${WORKSPACE}/build/lttng-modules-khdr"
+
+LINUX_GIT_REF_REPO_DIR="$HOME/gitcache/linux-stable.git/"
+
+OBJ_STORE_URL="s3://jenkins"
+
+cd "$WORKSPACE"
+
+# Create build directories
+mkdir -p "${LINUX_SRCOBJ_DIR}" "${LINUX_HDROBJ_DIR}" "${LINUX_INSTOBJ_DIR}" "${MODULES_OUTPUT_KSRC_DIR}" "${MODULES_OUTPUT_KHDR_DIR}"
 
-else # Regular build
+git_clone_modules_sources
 
-    # Build modules
-    KERNELDIR="${LNXBUILDDIR}" make -j${NPROC} V=1
+# Setup cross compile env if available
+if [ "x${cross_arch}" != "x" ]; then
+
+    case "$cross_arch" in
+        "armhf")
+            karch="arm"
+            cross_compile="arm-linux-gnueabihf-"
+            vanilla_config="imx_v6_v7_defconfig"
+            ubuntu_config="armhf-config.flavour.generic"
+            ;;
+
+        "arm64")
+            karch="arm64"
+            cross_compile="aarch64-linux-gnu-"
+            vanilla_config="defconfig"
+            ubuntu_config="arm64-config.flavour.generic"
+            ;;
+
+        "powerpc")
+            karch="powerpc"
+            cross_compile="powerpc-linux-gnu-"
+            vanilla_config="ppc44x_defconfig"
+            ubuntu_config="powerpc-config.flavour.powerpc-smp"
+            ;;
+
+        "ppc64el")
+            karch="powerpc"
+            cross_compile="powerpc64le-linux-gnu-"
+            vanilla_config="pseries_le_defconfig"
+            ubuntu_config="ppc64el-config.flavour.generic"
+            ;;
+
+        *)
+            echo "Unsupported cross arch $cross_arch"
+            exit 1
+            ;;
+    esac
+
+    # Export variables used by Kbuild for cross compilation
+    export ARCH="${karch}"
+    export CROSS_COMPILE="${cross_compile}"
+
+# Set arch specific values if we are not cross compiling
+elif [ "x${arch}" != "x" ]; then
+
+    case "$arch" in
+        "i386")
+            karch="x86"
+            vanilla_config="allyesconfig"
+            ubuntu_config="i386-config.flavour.generic"
+            ;;
+
+        "amd64")
+            karch="x86"
+            vanilla_config="allyesconfig"
+            ubuntu_config="amd64-config.flavour.generic"
+            ;;
+
+        "armhf")
+            karch="arm"
+            vanilla_config="allyesconfig"
+            ubuntu_config="armhf-config.flavour.generic"
+            ;;
+
+        "arm64")
+            karch="arm64"
+            vanilla_config="allyesconfig"
+            ubuntu_config="arm64-config.flavour.generic"
+            ;;
+
+        "powerpc")
+            karch="powerpc"
+            vanilla_config="allyesconfig"
+            ubuntu_config="powerpc-config.flavour.powerpc-smp"
+            ;;
+
+        "ppc64el")
+            karch="powerpc"
+            vanilla_config="allyesconfig"
+            ubuntu_config="ppc64el-config.flavour.generic"
+            ;;
+
+        *)
+            echo "Unsupported arch $arch"
+            exit 1
+            ;;
+    esac
+else
+    echo "Not arch or cross_arch specified"
+    exit 1
+fi
+
+
+
+# First get the kernel build from the object store, or build it, if it's
+# not available.
+
+echo "# Setup endpoint
+host_base = obj.internal.efficios.com
+host_bucket = obj.internal.efficios.com
+bucket_location = us-east-1
+use_https = True
+
+# Setup access keys
+access_key = jenkins
+secret_key = echo123456
+
+# Enable S3 v4 signature APIs
+signature_v2 = False" > "$WORKSPACE/.s3cfg"
+
+url_hash="$(echo -n "$kgitrepo" | md5sum | awk '{ print $1 }')"
+obj_name="linux.tar.bz2"
+obj_url_prefix="$OBJ_STORE_URL/linux-build/$url_hash/$ktag/$arch/${cross_arch:-native}"
+obj_url="$obj_url_prefix/$obj_name"
+
+set +e
+s3cmd -c "$WORKSPACE/.s3cfg" get "$obj_url"
+ret=$?
+set -e
+
+case "$ret" in
+    "0")
+      extract_archive_obj
+      ;;
+
+    "12")
+      echo "File not found"
+
+      # Build all the things and upload
+      # then finish the module build...
+
+      git_clone_linux_sources
+      git_export_linux_sources
+
+      select_compiler
+
+      ## PREPARE FULL LINUX SOURCE TREE
+      build_linux_kernel
+
+      ## EXTRACT DISTRO STYLE KERNEL HEADERS / DEVEL
+      extract_distro_headers
+
+      tar_archive_obj
+
+      upload_archive_obj
+
+      ;;
+
+    *)
+      echo "Unknown error? Abort"
+      exit 1
+      ;;
+esac
+
+select_compiler
+
+## BUILD modules
+# Either we downloaded a pre-build kernel or we built it and uploaded
+# the archive for future builds.
+
+cd "$WORKSPACE"
+
+# Build modules against full kernel sources
+build_modules "${LINUX_SRCOBJ_DIR}" "${MODULES_OUTPUT_KSRC_DIR}"
+
+# Build modules against kernel headers
+build_modules "${LINUX_HDROBJ_DIR}" "${MODULES_OUTPUT_KHDR_DIR}"
+
+# Make sure some modules were actually built
+tree "${MODULES_OUTPUT_KSRC_DIR}"
+if [ "x$(find "${MODULES_OUTPUT_KSRC_DIR}" -name '*.ko*' -printf yes -quit)" != "xyes" ]; then
+  echo "No modules built!"
+  exit 1
+fi
 
-    # Install modules to build dir
-    KERNELDIR="${LNXBUILDDIR}" make INSTALL_MOD_PATH="${BUILDDIR}" modules_install
+tree "${MODULES_OUTPUT_KHDR_DIR}"
+if [ "x$(find "${MODULES_OUTPUT_KHDR_DIR}" -name '*.ko*' -printf yes -quit)" != "xyes" ]; then
+  echo "No modules built!"
+  exit 1
 fi
 
 # EOF