s390: introduce .boot.preserved.data section compile time validation

Same as for .boot.data section make sure that .boot.preserved.data
sections of vmlinux and arch/s390/compressed/vmlinux match before
producing the compressed kernel image. Symbols presence, order and sizes
are cross-checked.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/boot/Makefile

@@ -30,7 +30,7 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
 
 obj-y	:= head.o als.o startup.o mem_detect.o ipl_parm.o string.o ebcdic.o
 obj-y	+= sclp_early_core.o mem.o ipl_vmparm.o cmdline.o ctype.o
-targets	:= bzImage startup.a section_cmp.boot.data $(obj-y)
+targets	:= bzImage startup.a section_cmp.boot.data section_cmp.boot.preserved.data $(obj-y)
 subdir-	:= compressed
 
 OBJECTS := $(addprefix $(obj)/,$(obj-y))
@@ -48,7 +48,7 @@ define cmd_section_cmp
 	touch $@
 endef
 
-$(obj)/bzImage: $(obj)/compressed/vmlinux $(obj)/section_cmp.boot.data FORCE
+$(obj)/bzImage: $(obj)/compressed/vmlinux $(obj)/section_cmp.boot.data $(obj)/section_cmp.boot.preserved.data FORCE
 	$(call if_changed,objcopy)
 
 $(obj)/section_cmp%: vmlinux $(obj)/compressed/vmlinux FORCE