+ if [ "$?" -gt 1 ] ; then
+ echo "Serious issue patching"
+ exit 1
+ fi
+}
+
+build_linux_kernel() {
+ cd "$LINUX_SRCOBJ_DIR"
+
+ kversion=$(make -s kernelversion "${make_args[@]}")
+ pahole_version="$(pahole --version | tr -d 'v')"
+
+ if { verlt "${kversion}" "3.3"; } && [ "${vanilla_config}" = "imx_v6_v7_defconfig" ] ; then
+ # imx_v6_v7 didn't exist before 06965c39b4c63933fa0a1cde2237ef85477c5655
+ if { verlt "${kversion}" "3.2"; } ; then
+ vanilla_config='mx5_defconfig'
+ else
+ vanilla_config='mx51_defconfig'
+ fi
+ fi
+
+ if { verlt "${kversion}" "3.13"; } && [ "${vanilla_config}" = "pseries_le_defconfig" ] ; then
+ # pseries_le_deconfig was introduced in f53e462e907cbaed29c49c0f10f5b8f614e1bf1d
+ vanilla_config='pseries_defconfig'
+ fi
+
+ # Generate kernel configuration
+ case "$ktag" in
+ Ubuntu*)
+ if [ "${cross_arch}" = "powerpc" ]; then
+ if vergte "${kversion}" "4.10"; then
+ echo "Ubuntu removed big endian powerpc configuration from kernel >= 4.10. Don't try to build it."
+ exit 0
+ fi
+ fi
+
+ # Disable riscv64 config generation, we don't have a toolchain on bionic
+ sed -i 's/riscv64 //' debian.master/etc/kernelconfig
+
+ fakeroot debian/rules clean KW_DEFCONFIG_DIR=.
+
+ # Hack for kernel Ubuntu-hwe-5.8
+ # The debian/control file is produced by the clean target above, so this
+ # check needs to happen afterwards.
+ if [ ! -f "debian/compat" ] && ! grep -q debhelper-compat debian/control; then
+ echo "10" > "debian/compat"
+ fi
+
+ # genconfigs check can fail in certain cases, eg. when a more recent
+ # compiler exposes kernel configuration flags which aren't set in the
+ # Ubuntu annotations.
+ # In any case, the configuration will be updated with any missing values
+ # later in our build script.
+ fakeroot debian/rules genconfigs KW_DEFCONFIG_DIR=. do_skip_checks=true
+ cp CONFIGS/"${ubuntu_config}" .config
+ ;;
+
+ *)
+ # Force 32bit build on i386, default is 64bit
+ if [ "$arch" = "i386" ]; then
+ export ARCH="i386"
+ fi
+
+ make "${vanilla_config}" "${make_args[@]}"
+ ;;
+ esac
+
+ if [ "${vanilla_config}" = "pseries_defconfig" ] && [ "${cross_arch}" = "ppc64el" ] ; then
+ # @see diff <(git show v3.13:arch/powerpc/configs/pseries_defconfig) <(git show v3.13:arch/powerpc/configs/pseries_le_defconfig)
+ scripts/config --enable CONFIG_CPU_LITTLE_ENDIAN
+ scripts/config --enable CONFIG_CMA
+ scripts/config --disable CONFIG_XMON_DEFAULT
+ # scripts/config --disable CONFIG_VIRTUALIZATION
+ # scripts/config --disable CONFIG_KVM_BOOK3S_64
+ scripts/config --disable CONFIG_KVM_BOOK3S_64_HV
+ fi
+
+ # oldnoconfig was renamed in 4.19
+ if vergte "$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 [ "$HOSTCC" != "gcc-4.8" ]; then
+ if [ -f "arch/x86/kvm/svm.c" ]; then
+ sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/svm.c
+ fi
+
+ if [ -f "arch/x86/kvm/vmx.c" ]; then
+ sed -i 's/ R"/ R "/g; s/"R"/" R "/g' arch/x86/kvm/vmx.c
+ fi
+ fi
+
+ if { verlt "${kversion}" "5.11"; } && { vergte "${kversion}" "4.10"; } ; then
+ # Binutils > 2.35 strips empty symbol tables, causing obltool to fail
+ # in certain cases when files are empty.
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/1d489151e9f9d1647110277ff77282fe4d96d09b
+ #
+ # There doesn't seem to be any LD/AS/AR flags to control this behaviour,
+ # therefore patching tools/objtool/elf.c is attempted.
+ patch_linux_kernel 1d489151e9f9d1647110277ff77282fe4d96d09b
+ if { verlt "${kversion}" "4.18"; } ; then
+ patch_linux_kernel e81e0724432542af8d8c702c31e9d82f57b1ff31
+ fi
+ fi
+
+ if { vergt "${selected_cc_version}" "7"; } && { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.17"; } ; then
+ # Builds fail due to -Werror=restrict in pager.o and str_error_r.o
+ if { verlt "${kversion}" "4.16"; } ; then
+ # This is patched since objtool's Makefile doesn't respect HOSTCFLAGS
+ # @see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad343a98e74e85aa91d844310e797f96fee6983b
+ patch_linux_kernel ad343a98e74e85aa91d844310e797f96fee6983b
+ fi
+ if { verlt "${kversion}" "4.17"; } ; then
+ # This is patched since objtool's Makefile doesn't respect HOSTCFLAGS
+ # @see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=854e55ad289ef8888e7991f0ada85d5846f5afb9
+ patch_linux_kernel 854e55ad289ef8888e7991f0ada85d5846f5afb9
+ fi
+
+ fi
+
+ if { vergt "${selected_cc_version}" "9"; } && { verlt "${kversion}" "5.6"; } ; then
+ # Duplicate decalarations of __force_order
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/df6d4f9db79c1a5d6f48b59db35ccd1e9ff9adfc
+ patch_linux_kernel df6d4f9db79c1a5d6f48b59db35ccd1e9ff9adfc
+ # However, kaslr_64.c doesn't exit in 4.15, 4.16, it's named pagetable.c
+ if [ -f arch/x86/boot/compressed/pagetable.c ] ; then
+ sed -i '/^unsigned long __force_order;$/d' arch/x86/boot/compressed/pagetable.c
+ fi
+ fi
+
+ if { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.18"; } ; then
+ # Some old kernels fail to build when make is too new
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/9feeb638cde083c737e295c0547f1b4f28e99583
+ patch_linux_kernel 9564a8cf422d7b58f6e857e3546d346fa970191e
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/9feeb638cde083c737e295c0547f1b4f28e99583
+ patch_linux_kernel 9feeb638cde083c737e295c0547f1b4f28e99583
+ fi
+
+ if { vergte "${kversion}" "4.12"; } && { verlt "${kversion}" "4.19"; } ; then
+ # Old kernels can fail to build while on newer host kernels with errors
+ # such as:
+ # In file included from scripts/selinux/genheaders/genheaders.c:19:
+ # ./security/selinux/include/classmap.h:249:2: error: #error New address family defined, please update secclass_map.
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/dfbd199a7cfe3e3cd8531e1353cdbd7175bfbc5e
+ #
+ patch_linux_kernel dfbd199a7cfe3e3cd8531e1353cdbd7175bfbc5e
+ fi
+
+ if { vergte "${kversion}" "3.18"; } && { verlt "${kversion}" "4.4"; } ; then
+ # Compatibility with binutils >= ~ 2.31
+ patch_linux_kernel b21ebf2fb4cde1618915a97cc773e287ff49173e
+ fi
+
+ # The above patch only partially applies linux 3.17, and has been, so a
+ # rebased version is used instead.
+ if { vergte "${kversion}" "3.17"; } && { verlt "${kversion}" "3.18"; } ; then
+ cat <<'EOF' | patch -p1
+diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
+index 48598105..0652c5b6 100644
+--- a/arch/x86/kernel/machine_kexec_64.c
++++ b/arch/x86/kernel/machine_kexec_64.c
+@@ -516,6 +516,7 @@ int arch_kexec_apply_relocations_add(const Elf64_Ehdr *ehdr,
+ goto overflow;
+ break;
+ case R_X86_64_PC32:
++ case R_X86_64_PLT32:
+ value -= (u64)address;
+ *(u32 *)location = value;
+ break;
+diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
+index e69f9882..7c6bc9fe 100644
+--- a/arch/x86/kernel/module.c
++++ b/arch/x86/kernel/module.c
+@@ -180,6 +180,7 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
+ goto overflow;
+ break;
+ case R_X86_64_PC32:
++ case R_X86_64_PLT32:
+ val -= (u64)loc;
+ *(u32 *)loc = val;
+ #if 0
+diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
+index bbb1d225..8deeacbc 100644
+--- a/arch/x86/tools/relocs.c
++++ b/arch/x86/tools/relocs.c
+@@ -763,6 +763,7 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
+ switch (r_type) {
+ case R_X86_64_NONE:
+ case R_X86_64_PC32:
++ case R_X86_64_PLT32:
+ /*
+ * NONE can be ignored and PC relative relocations don't
+ * need to be adjusted.
+EOF
+ fi
+
+ if ( { vergte "${kversion}" "3.14"; } && { verlt "${kversion}" "4.4"; } ) ||
+ ( { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.17"; } ); then
+ # While the original motivation of this patch is for fixing builds using
+ # clang, the same error occurs between linux >= 3.14 and < 4.4, and in
+ # 4.15, 4.16.
+ #
+ # This patch only partially applies due to changes in kernel/Makefile,
+ # so a supplementary patch is needed
+ #
+ # Without this patch, builds fail with
+ # Cannot find symbol for section 2: .text.
+ # kernel/elfcore.o: failed
+ #
+ # @see https://github.com/linuxppc/issues/issues/388
+ # @see https://lore.kernel.org/lkml/20201204165742.3815221-2-arnd@kernel.org/
+ #
+ patch_linux_kernel 6e7b64b9dd6d96537d816ea07ec26b7dedd397b9
+ if grep -q elfcore.o kernel/Makefile ; then
+ sed -i '/^.* += elfcore.o$/d' kernel/Makefile
+ fi
+ fi
+ # Same as above for the v4.4 branch
+ if ( { vergte "${kversion}" "4.4"; } && { verlt "${kversion}" "4.4.257"; } ); then
+ patch_linux_kernel 3140b0740b31cc63cf2ee08bc3f746b423eb068d
+ if grep -q elfcore.o kernel/Makefile ; then
+ sed -i '/^.* += elfcore.o$/d' kernel/Makefile
+ fi
+ fi
+
+ if { vergte "${kversion}" "4.5"; } && { verlt "${kversion}" "4.8"; } ; then
+ # Kernels between v4.5 and v4.8 built with gcc >= 8 on arm will hit an
+ # assembler error :
+ #
+ # kernel/.tmp_fork.s: Assembler messages:
+ # kernel/.tmp_fork.s:1790: Error: .err encountered
+ #
+ # @see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85745
+ #
+ patch_linux_kernel 9f73bd8bb445e0cbe4bcef6d4cfc788f1e184007
+ 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 "$kversion" "3.0"; then
+ sed -i '/linux\/compiler.h/a #include <linux\/linkage.h> \/* For asmregparm *\/' arch/x86/include/asm/ptrace.h
+ sed -i 's/extern long syscall_trace_enter/extern asmregparm long syscall_trace_enter/' arch/x86/include/asm/ptrace.h
+ sed -i 's/extern void syscall_trace_leave/extern asmregparm void syscall_trace_leave/' arch/x86/include/asm/ptrace.h
+ echo "header-y += linkage.h" >> include/linux/Kbuild
+ fi
+
+ if [ "${cross_arch}" = "powerpc" ] ; then
+ if { vergte "${kversion}" "4.15"; } && { verlt "${kversion}" "4.16"; } ; then
+ # Avoid register errors such as
+ # aes_generic.c:(.text+0x4e0): undefined reference to `_restgpr_31_x'
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/148b974deea927f5dbb6c468af2707b488bfa2de
+ make_args+=(
+ CFLAGS_aes_generic.o=''
+ )
+ fi
+ fi
+
+ if [ "$(scripts/config --state CONFIG_DEBUG_INFO_BTF)" == "y" ] &&
+ { vergte "${pahole_version}" "1.24"; } &&
+ { vergte "${kversion}" "5.10"; } && { verlt "${kversion}" "6.0"; } ;then
+ # Some kernels Eg. Ubuntu-hwe-5.13-5.13.0-52.59_20.04.1
+ # fail with the following error:
+ # BTFIDS vmlinux
+ # FAILED: load BTF from vmlinux: Invalid argument
+ #
+ # When CONFIG_DEBUG_INFO_BTF is set, certain versions of pahole require
+ # `--skip_encoding_btf_enum64` to be passed as the kernel doesn't define
+ # BTF_KIND_ENUM64.
+ #
+ # Introduced in 341dfcf8d78eaa3a2dc96dea06f0392eb2978364 (~v5.10)
+ # @see https://lore.kernel.org/bpf/20220825171620.cioobudss6ovyrkc@altlinux.org/t/
+ #
+ if [ -f "scripts/pahole-flags.sh" ] ; then
+ sed -i 's/ -J ${PAHOLE_FLAGS} / -J ${PAHOLE_FLAGS} --skip_encoding_btf_enum64 /' scripts/link-vmlinux.sh
+ else
+ sed -i 's/ -J ${extra_paholeopt} / -J ${extra_paholeopt} --skip_encoding_btf_enum64 /' scripts/link-vmlinux.sh
+ fi
+ fi
+
+ # GCC 4.8
+ if [ "$HOSTCC" == "gcc-4.8" ]; then
+ scripts/config --disable CONFIG_CC_STACKPROTECTOR_STRONG
+ scripts/config --disable CONFIG_PPC_OF_BOOT_TRAMPOLINE
+ 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
+ # More recent compiler optimizations (from gcc 8 onwards )expose build errors
+ # with netronome on older kernels.
+ # Observed in 4.11-rt, 4.15-4.17, 5.0-rt - 5.16-rt
+ # It seems easier to disable the driver than to attempt patching.
+ # Eg.
+ # In function ‘ur_load_imm_any’,
+ # inlined from ‘jeq_imm’ at drivers/net/ethernet/netronome/nfp/bpf/jit.c:3146:13:
+ # ./include/linux/compiler.h:350:45: error: call to ‘__compiletime_assert_1062’ declared with attribute error: FIELD_FIT: value too large for the field
+ # 350 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
+ #
+ scripts/config --disable CONFIG_NET_VENDOR_NETRONOME
+ # Eg.
+ # In function ‘memcpy’,
+ # inlined from ‘kszphy_get_strings’ at drivers/net/phy/micrel.c:664:3:
+ # ./include/linux/string.h:305:25: error: call to ‘__read_overflow2’ declared with attribute error: detected read beyond size of object passed as 2nd parameter
+ # 305 | __read_overflow2();
+ # | ^~~~~~~~~~~~~~~~~~
+ # make[3]: *** [scripts/Makefile.build:308: drivers/net/phy/micrel.o] Error 1
+ #
+ scripts/config --disable CONFIG_MICREL_PHY
+
+
+ # 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
+
+ # Don't fail the build on warnings
+ scripts/config --disable CONFIG_WERROR
+ scripts/config --enable CONFIG_PPC_DISABLE_WERROR
+
+ # 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
+
+ if [ -n "${DEBUG}" ] ; then
+ cat .config
+ fi
+
+ make "$update_conf_target" "${make_args[@]}"
+ make -j"$NPROC" "${make_args[@]}"
+
+ krelease=$(make -s kernelrelease "${make_args[@]}")
+
+ # Save the kernel and modules
+ mkdir -p "$LINUX_INSTOBJ_DIR/boot"
+ make INSTALL_MOD_PATH="$LINUX_INSTOBJ_DIR" INSTALL_MOD_STRIP=1 modules_install "${make_args[@]}"
+ make INSTALL_MOD_PATH="$LINUX_INSTOBJ_DIR" INSTALL_PATH="$LINUX_INSTOBJ_DIR/boot" install "${make_args[@]}"
+ rm -f "$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"
+}
+