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Commit 0efa4703 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky
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[S390] config option for z9-109 code generation. 



Add a kernel config option for the IBM System z9. This will produce
faster code on newer compilers using the -march=z9-109 option.

Signed-off-by: default avatarChristian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent d9f7a745

arch/s390/Kconfig

+8 −0
Original line number Original line Diff line number Diff line
@@ -153,6 +153,14 @@ config MARCH_Z990 
	  This will be slightly faster but does not work on

	  This will be slightly faster but does not work on

	  older machines such as the z900.

	  older machines such as the z900.





config MARCH_Z9_109

	bool "IBM System z9"

	help

	  Select this to enable optimizations for IBM System z9-109, IBM

	  System z9 Enterprise Class (z9 EC), and IBM System z9 Business

	  Class (z9 BC). The kernel will be slightly faster but will not

	  work on older machines such as the z990, z890, z900, and z800.



endchoice

endchoice





config PACK_STACK

config PACK_STACK

arch/s390/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -33,6 +33,7 @@ endif 
cflags-$(CONFIG_MARCH_G5)   += $(call cc-option,-march=g5)

cflags-$(CONFIG_MARCH_G5)   += $(call cc-option,-march=g5)

cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)

cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)

cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)

cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)

cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)





#

#

# Prevent tail-call optimizations, to get clearer backtraces:

# Prevent tail-call optimizations, to get clearer backtraces: