[S390] remove redundant stack check option

Newer gcc versions offer an architecture-independent option to check
the stack size and warn if it reaches a certain limit. This option
already existed for s390 by using -mwarn-dynamicstack. Since one
stack check option is enough remove the s390 specific stack check
but keep the option that warns about dynamic stack usage because
that is not covered by the generic option.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 636bcb8..271a02f 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -341,26 +341,16 @@ config STACK_GUARD
          The minimum size for the stack guard should be 256 for 31 bit and
          512 for 64 bit.
 
-config WARN_STACK
+config WARN_DYNAMIC_STACK
        def_bool n
-       prompt "Emit compiler warnings for function with broken stack usage"
+       prompt "Emit compiler warnings for function with dynamic stack usage"
        help
-         This option enables the compiler options -mwarn-framesize and
-         -mwarn-dynamicstack. If the compiler supports these options it
-         will generate warnings for function which either use alloca or
-         create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
+         This option enables the compiler option -mwarn-dynamicstack. If the
+         compiler supports this options generates warnings for functions
+         that dynamically allocate stack space using alloca.
 
          Say N if you are unsure.
 
-config WARN_STACK_SIZE
-       int "Maximum frame size considered safe (128-2048)"
-       range 128 2048
-       depends on WARN_STACK
-       default "2048"
-       help
-         This allows you to specify the maximum frame size a function may
-         have without the compiler complaining about it.
-
 config ARCH_POPULATES_NODE_MAP
        def_bool y
 

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index d5b8a6a..27a0b5d 100644 (file)
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -80,8 +80,7 @@ endif
 endif
 
 ifeq ($(call cc-option-yn,-mwarn-dynamicstack),y)
-cflags-$(CONFIG_WARN_STACK) += -mwarn-dynamicstack
-cflags-$(CONFIG_WARN_STACK) += -mwarn-framesize=$(CONFIG_WARN_STACK_SIZE)
+cflags-$(CONFIG_WARN_DYNAMIC_STACK) += -mwarn-dynamicstack
 endif
 
 KBUILD_CFLAGS  += -mbackchain -msoft-float $(cflags-y)