The upcomming gcc 4.2 got a new option -mtune=generic to tune code for both common AMD and Intel CPUs. Use this option when available for generic kernels. On x86-64 it is used with CONFIG_GENERIC_CPU. On i386 it is enabled with CONFIG_X86_GENERIC. It won't affect the base line CPU support in any ways and also not the minimum supported CPU. Signed-off-by: Andi Kleen <ak@xxxxxxx> arch/i386/Makefile.cpu | 4 ++++ arch/x86_64/Makefile | 1 + 2 files changed, 5 insertions(+) Index: linux/arch/i386/Makefile.cpu =================================================================== --- linux.orig/arch/i386/Makefile.cpu +++ linux/arch/i386/Makefile.cpu @@ -39,3 +39,7 @@ cflags-$(CONFIG_X86_ELAN) += -march=i486 # Geode GX1 support cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx +# add at the end to overwrite eventual tuning options from earlier +# cpu entries +cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic) + Index: linux/arch/x86_64/Makefile =================================================================== --- linux.orig/arch/x86_64/Makefile +++ linux/arch/x86_64/Makefile @@ -29,6 +29,7 @@ CHECKFLAGS += -D__x86_64__ -m64 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) +cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) CFLAGS += $(cflags-y) CFLAGS += -m64 - : send the line "unsubscribe linux-x86_64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
