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From: Sami Tolvanen <samitolvanen@google.com>
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Cc: Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH v2 06/18] arm64: kvm: use -fno-jump-tables with clang
Date: Wed, 15 Nov 2017 13:34:16 -0800
Message-Id: <20171115213428.22559-7-samitolvanen@google.com>
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Use -fno-jump-tables to make sure clang doesn't generate branches
to EL1 virtual addresses.

Suggested-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
 arch/arm64/kvm/hyp/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index f04400d494b7..19fa1c6b6b69 100644
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -5,6 +5,10 @@
 
 ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING
 
+ifeq ($(cc-name),clang)
+ccflags-y += -fno-jump-tables
+endif
+
 KVM=../../../../virt/kvm
 
 obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
-- 
2.15.0.448.gf294e3d99a-goog