From: Sami Tolvanen <samitolvanen@google.com>
To: Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>
Cc: Nathan Chancellor <nathan@kernel.org>,
Kees Cook <keescook@chromium.org>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH] KVM: arm64: Disable LTO in hyp
Date: Thu, 4 Mar 2021 10:45:44 -0800 [thread overview]
Message-ID: <20210304184544.2014171-1-samitolvanen@google.com> (raw)
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
next reply other threads:[~2021-03-04 18:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 18:45 Sami Tolvanen [this message]
2021-03-04 19:15 ` Marc Zyngier
2021-03-04 21:25 ` Sami Tolvanen
2021-03-04 22:17 ` Marc Zyngier
2021-03-04 22:34 ` Sami Tolvanen
2021-03-05 2:38 ` Sami Tolvanen
2021-03-05 11:36 ` Marc Zyngier
2021-03-05 14:22 ` Ard Biesheuvel
2021-03-05 16:55 ` Sami Tolvanen
2021-03-05 17:07 ` Marc Zyngier
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