[S390] Improved kernel stack overflow checking.

Recent cvs versions of gcc have support for an improved stack overflow
checking that calculates the size of the guard size for each function.
If the compiler accepts -mstack-size without -mstack-guard then the
new stack check is available. We always want to use the new stack
checker.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index b1e558496469c1f9074658fd6ae253b4a7fed4ff..ece5adc0560673f5f4ca013c0f15cd8e130fd0d7 100644 (file)
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -67,8 +67,10 @@ endif
 
 ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)
 cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)
+ifneq ($(call cc-option-yn,-mstack-size=8192),y)
 cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)
 endif
+endif
 
 ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
 cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack