[PATCH v5 01/40] arm64: Enable armv8.5-a asm-arch option
From: Andrey Konovalov <hidden>
Date: 2020-10-12 20:45:02
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: Vincenzo Frascino <vincenzo.frascino@arm.com> Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) which is an armv8.5-a architecture extension. Enable the correct asm option when the compiler supports it in order to allow the usage of ALTERNATIVE()s with MTE instructions. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrey Konovalov <redacted> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> --- Change-Id: I172e15e4c189f073e4c14a10276b276092e76536 --- arch/arm64/Kconfig | 4 ++++ arch/arm64/Makefile | 5 +++++ 2 files changed, 9 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e7450fbd0aa7..f27297ac70bf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -1600,6 +1600,9 @@ endmenu menu "ARMv8.5 architectural features" +config AS_HAS_ARMV8_5 + def_bool $(cc-option,-Wa$(comma)-march=armv8.5-a) + config ARM64_BTI bool "Branch Target Identification support" default y
@@ -1676,6 +1679,7 @@ config ARM64_MTE bool "Memory Tagging Extension support" default y depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI + depends on AS_HAS_ARMV8_5 select ARCH_USES_HIGH_VMA_FLAGS help Memory Tagging (part of the ARMv8.5 Extensions) provides
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 130569f90c54..afcd61f7d2b0 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile@@ -94,6 +94,11 @@ ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) asm-arch := armv8.4-a endif +ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) +# make sure to pass the newest target architecture to -march. +asm-arch := armv8.5-a +endif + ifdef asm-arch KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ -DARM64_ASM_ARCH='"$(asm-arch)"'
--
2.28.0.1011.ga647a8990f-goog
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