From: Christian Borntraeger <[email protected]>
[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]>
---
arch/s390/Kconfig | 8 ++++++++
arch/s390/Makefile | 1 +
2 files changed, 9 insertions(+)
diff -urpN linux-2.6/arch/s390/Kconfig linux-2.6-patched/arch/s390/Kconfig
--- linux-2.6/arch/s390/Kconfig 2006-09-28 14:58:55.000000000 +0200
+++ linux-2.6-patched/arch/s390/Kconfig 2006-09-28 14:58:55.000000000 +0200
@@ -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 -urpN linux-2.6/arch/s390/Makefile linux-2.6-patched/arch/s390/Makefile
--- linux-2.6/arch/s390/Makefile 2006-09-20 05:42:06.000000000 +0200
+++ linux-2.6-patched/arch/s390/Makefile 2006-09-28 14:58:55.000000000 +0200
@@ -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: