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Subject[PATCH] KVM: arm64: Disable LTO in hyp
From
allmodconfig + CONFIG_LTO_CLANG_THIN=y fails to build due to following
linker errors:

ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21CC):
relocation R_AARCH64_CONDBR19 out of range: 2031220 is not in
[-1048576, 1048575]; references hyp_panic
>>> defined in vmlinux.o

ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21E0):
relocation R_AARCH64_ADR_PREL_LO21 out of range: 2031200 is not in
[-1048576, 1048575]; references hyp_panic
>>> defined in vmlinux.o

As LTO is not really necessary for the hypervisor code, disable it for
the hyp directory to fix the build.

Link: https://github.com/ClangBuiltLinux/linux/issues/1317
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
arch/arm64/kvm/hyp/Makefile | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index 687598e41b21..e8116016e6a8 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -11,3 +11,6 @@ subdir-ccflags-y := -I$(incdir) \
$(DISABLE_STACKLEAK_PLUGIN)

obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o
+
+# Disable LTO for the files in this directory
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
base-commit: f69d02e37a85645aa90d18cacfff36dba370f797
--
2.30.1.766.gb4fecdf3b7-goog

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