On Fri, May 01, 2020 at 08:42:13AM +0000, Dmitry Golovin wrote: > LLD by default disallows relocations in read-only segments. For a > relocatable kernel, we pass -z notext to the linker to explicitly > allow relocations. This behavior is the default for BFD. > > Link: https://github.com/ClangBuiltLinux/linux/issues/579 > Signed-off-by: Dmitry Golovin <[email protected]>
I was able to link a Clang built i386_defconfig kernel with ld.lld and boot it in QEMU 5.0 after this change. A GCC built kernel links still with ld.bfd and also boots in QEMU successfully. x86_64_defconfig with both compilers and their respective linkers did not regress. Tested-by: Nathan Chancellor <[email protected]> > --- > arch/x86/boot/compressed/Makefile | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/x86/boot/compressed/Makefile > b/arch/x86/boot/compressed/Makefile > index 5f7c262bcc99..7214751e1671 100644 > --- a/arch/x86/boot/compressed/Makefile > +++ b/arch/x86/boot/compressed/Makefile > @@ -57,6 +57,9 @@ else > KBUILD_LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" > \ > && echo "-z noreloc-overflow -pie --no-dynamic-linker") > endif > +ifeq ($(CONFIG_RELOCATABLE), y) > +KBUILD_LDFLAGS += -z notext > +endif > LDFLAGS_vmlinux := -T > > hostprogs := mkpiggy > -- > 2.25.1 >
