diff options
| -rw-r--r-- | arch/x86/Kconfig.cpu | 14 | ||||
| -rw-r--r-- | arch/x86/Makefile | 5 |
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 753b8763abae..9d108a54c30a 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -245,6 +245,20 @@ config MATOM endchoice +config X86_NATIVE_CPU + bool "Build and optimize for local/native CPU" + depends on X86_64 + default n + help + Optimize for the current CPU used to compile the kernel. + Use this option if you intend to build the kernel for your + local machine. + + Note that such a kernel might not work optimally on a + different x86 machine. + + If unsure, say N. + config X86_GENERIC bool "Generic x86 support" depends on X86_32 diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 594723005d95..9b76e77ff7f7 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -173,8 +173,13 @@ else # Use -mskip-rax-setup if supported. KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) +ifdef CONFIG_X86_NATIVE_CPU + KBUILD_CFLAGS += -march=native + KBUILD_RUSTFLAGS += -Ctarget-cpu=native +else KBUILD_CFLAGS += -march=x86-64 -mtune=generic KBUILD_RUSTFLAGS += -Ctarget-cpu=x86-64 -Ztune-cpu=generic +endif KBUILD_CFLAGS += -mno-red-zone KBUILD_CFLAGS += -mcmodel=kernel |