Fix from newer kernels

--- arch/s390/Makefile
+++ arch/s390/Makefile
@@ -66,7 +66,7 @@
 cflags-$(CONFIG_WARN_STACK) += -mwarn-framesize=$(CONFIG_WARN_STACK_SIZE)
 endif
 
-CFLAGS		+= -mbackchain $(cflags-y)
+CFLAGS		+= -mbackchain -msoft-float $(cflags-y)
 CFLAGS		+= $(call cc-option,-finline-limit=10000)
 CFLAGS 		+= -pipe -fno-strength-reduce -Wno-sign-compare 
 AFLAGS		+= $(aflags-y)