+ 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 "${kversion}" "4.17"; } ; then
+ # This is patched since objtool's Makefile doesn't respect HOSTCFLAGS
+ # @see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=854e55ad289ef8888e7991f0ada85d5846f5afb9
+ patch_linux_kernel 854e55ad289ef8888e7991f0ada85d5846f5afb9
+ fi
+
+ # Duplicate decalarations of __force_order
+ # @see https://gitlab.com/linux-kernel/stable/-/commit/df6d4f9db79c1a5d6f48b59db35ccd1e9ff9adfc
+ # However, kaslr_64.c doesn't exit in 4.15, 4.16, it's named pagetable.c
+ if [ -f arch/x86/boot/compressed/pagetable.c ] ; then
+ sed -i '/^unsigned long __force_order;$/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 "${kversion}" "3.15"; } && { verlt "${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 >= 3.15 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$/d' kernel/Makefile
+ fi
+ fi
+
+ # Newer binutils don't accept 3 operand 'cmp' instructions on ppc64
+ # Convert them to 'cmpw' which was previously done silently
+ if verlt "$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
+