arm64: Always use REFCOUNT_FULL

As discussed at the Linux Security Summit, arm64 prefers to use
REFCOUNT_FULL by default. This enables it for the architecture.

Cc: hw.likun@huawei.com
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0df64a6..9fe7a7f 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -119,6 +119,7 @@ config ARM64
        select PCI_ECAM if ACPI
        select POWER_RESET
        select POWER_SUPPLY
+       select REFCOUNT_FULL
        select SPARSE_IRQ
        select SYSCTL_EXCEPTION_TRACE
        select THREAD_INFO_IN_TASK