Kernel build with clang and KCFLAGS=-fprofile-sample-use fails with: error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: Unexpected SHT_REL section ".rel.llvm.call-graph-profile" Starting from 13.0.0 llvm can generate SHT_REL section, see https://reviews.llvm.org/rGca3bdb57fa1ac98b711a735de048c12b5fdd8086. gen-hyprel does not support SHT_REL relocation section. Remove ".llvm.call-graph-profile" SHT_REL relocation from kvm_nvhe to fix the build. Signed-off-by: Denis Nikitin <denik@xxxxxxxxxxxx> --- V1 -> V2: Remove the relocation instead of disabling the profile-use flags. --- arch/arm64/kvm/hyp/nvhe/Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index b5c5119c7396..49ec950ac57b 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -78,8 +78,10 @@ $(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE # The HYPREL command calls `gen-hyprel` to generate an assembly file with # a list of relocations targeting hyp code/data. +# Starting from 13.0.0 llvm emits SHT_REL section '.llvm.call-graph-profile' +# when profile optimization is applied. gen-hyprel does not support SHT_REL. quiet_cmd_hyprel = HYPREL $@ - cmd_hyprel = $(obj)/gen-hyprel $< > $@ + cmd_hyprel = $(OBJCOPY) -R .llvm.call-graph-profile $<; $(obj)/gen-hyprel $< > $@ # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names # to avoid clashes with VHE code/data. -- 2.37.3.968.ga6b4b080e4-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
