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    Subject[PATCH v8 26/43] arm64: Enable armv8.5-a asm-arch option
    From
    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 <andreyknvl@google.com>
    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 d58b4dcc6d44..cebbd07ba27c 100644
    --- a/arch/arm64/Kconfig
    +++ b/arch/arm64/Kconfig
    @@ -1591,6 +1591,9 @@ 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
    @@ -1665,6 +1668,7 @@ 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 5789c2d18d43..50ad9cbccb51 100644
    --- a/arch/arm64/Makefile
    +++ b/arch/arm64/Makefile
    @@ -100,6 +100,11 @@ 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)"'
    --
    2.29.1.341.ge80a0c044ae-goog
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