[PATCH] x86-64: Use -mtune=generic for generic kernels (dca99a38) · Commits · 戴 / test

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@suse.de> Signed-off-by:

Linus Torvalds <torvalds@osdl.org>

arch/i386/Makefile.cpu

+4 −0

Original line number	Diff line number	Diff line
		@@ -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)

arch/x86_64/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

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