Commit 0efa4703 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky

[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
......@@ -153,6 +153,14 @@ config MARCH_Z990
This will be slightly faster but does not work on
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
config PACK_STACK
......
......@@ -33,6 +33,7 @@ endif
cflags-$(CONFIG_MARCH_G5) += $(call cc-option,-march=g5)
cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
cflags-$(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:
......
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