[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 <cborntra@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b6b42f9f0d5267a229f82837980ad7c3172797a7..f900a516f099bfc6724068af74b77d6149625cf0 100644 (file)
--- 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.
 
          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
 endchoice
 
 config PACK_STACK

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 74ef57dcfa60b5bb9527d6651440995851aa9ebd..5deb9f7544a1da444b1ba0034685d511c74fc67b 100644 (file)
--- 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_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:
 
 #
 # Prevent tail-call optimizations, to get clearer backtraces: