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[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>
hifive-unleashed-5.1
Andi Kleen 2006-03-25 16:29:06 +01:00 committed by Linus Torvalds
parent c7ea1a96ec
commit dca99a38bc
2 changed files with 5 additions and 0 deletions
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4
arch/i386/Makefile.cpu
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@ -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)

1
arch/x86_64/Makefile
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@ -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