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Commit be796285 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
parent 60691d3c

arch/s390/Makefile

+2 −0
Original line number Original line Diff line number Diff line
@@ -67,8 +67,10 @@ endif 




ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)

ifeq ($(call cc-option-yn,-mstack-size=8192 -mstack-guard=128),y)

cflags-$(CONFIG_CHECK_STACK) += -mstack-size=$(STACK_SIZE)

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)

cflags-$(CONFIG_CHECK_STACK) += -mstack-guard=$(CONFIG_STACK_GUARD)

endif

endif

endif





ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)

ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)

cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack

cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack