--- arch/x86/Kconfig.cpu

+++ arch/x86/Kconfig.cpu

@@ -323,7 +323,7 @@ config X86_L1_CACHE_SHIFT

config X86_XADD

def_bool y

- depends on X86_32 && !M386

+ depends on X86_64 || !M386

config X86_PPRO_FENCE

bool "PentiumPro memory ordering errata workaround"