[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: Christian Borntraeger <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
cbmeeks · Sep 28, 2006 · 0efa470 · 0efa470
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diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
@@ -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

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
@@ -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: