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Commit dca99a38 authored Mar 25, 2006 by Andi Kleen Committed by Linus Torvalds Mar 25, 2006

[PATCH] x86-64: Use -mtune=generic for generic kernels



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>

parent c7ea1a96

arch/i386/Makefile.cpu

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -39,3 +39,7 @@ cflags-$(CONFIG_X86_ELAN) += -march=i486
	# Geode GX1 support		# Geode GX1 support
	cflags-$(CONFIG_MGEODEGX1) += -march=pentium-mmx		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	Original line	Diff line number	Diff line
	@@ -29,6 +29,7 @@ CHECKFLAGS += -D__x86_64__ -m64

	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)		cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)		cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
			cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	CFLAGS += $(cflags-y)		CFLAGS += $(cflags-y)

	CFLAGS += -m64		CFLAGS += -m64