Messages in this thread Patch in this message | | | From | Denis Nikitin <> | Subject | [PATCH] KVM: arm64: nvhe: Disable profile optimization | Date | Tue, 20 Sep 2022 01:20:05 -0700 |
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Kernel build with -fprofile-sample-use raises the following failure:
error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: Unexpected SHT_REL section ".rel.llvm.call-graph-profile"
SHT_REL is generated by the latest lld, see https://reviews.llvm.org/rGca3bdb57fa1ac98b711a735de048c12b5fdd8086. Disable profile optimization in kvm/nvhe to fix the build with AutoFDO.
Signed-off-by: Denis Nikitin <denik@chromium.org> --- arch/arm64/kvm/hyp/nvhe/Makefile | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index b5c5119c7396..6a6188374a52 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -89,6 +89,9 @@ quiet_cmd_hypcopy = HYPCOPY $@ # Remove ftrace, Shadow Call Stack, and CFI CFLAGS. # This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) +# Profile optimization creates SHT_REL section '.llvm.call-graph-profile' for +# the hot code. SHT_REL is currently not supported by the KVM tools. +KBUILD_CFLAGS += $(call cc-option,-fno-profile-sample-use,-fno-profile-use) # KVM nVHE code is run at a different exception code with a different map, so # compiler instrumentation that inserts callbacks or checks into the code may -- 2.37.3.968.ga6b4b080e4-goog
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