sparc,sparc64: add BITS to arch Makefile

BITS will be used to simplify unified Makefiles
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/Makefile

@@ -11,9 +11,10 @@
 # Uncomment the first KBUILD_CFLAGS if you are doing kgdb source level
 # debugging of the kernel to get the proper debugging information.
 
-AS              := $(AS) -32
-LDFLAGS		:= -m elf32_sparc
-CHECKFLAGS	+= -D__sparc__
+AS             := $(AS) -32
+LDFLAGS        := -m elf32_sparc
+CHECKFLAGS     += -D__sparc__
+export BITS    := 32
 
 #KBUILD_CFLAGS += -g -pipe -fcall-used-g5 -fcall-used-g7
 KBUILD_CFLAGS += -m32 -pipe -mno-fpu -fcall-used-g5 -fcall-used-g7

arch/sparc64/Makefile

@@ -12,8 +12,8 @@ CHECKFLAGS	+= -D__sparc__ -D__sparc_v9__ -D__arch64__ -m64
 # Undefine sparc when processing vmlinux.lds - it is used
 # And teach CPP we are doing 64 bit builds (for this case)
 CPPFLAGS_vmlinux.lds += -m64 -Usparc
-
-LDFLAGS		:= -m elf64_sparc
+LDFLAGS              := -m elf64_sparc
+export BITS          := 64
 
 KBUILD_CFLAGS += -m64 -pipe -mno-fpu -mcpu=ultrasparc -mcmodel=medlow \
 	-ffixed-g4 -ffixed-g5 -fcall-used-g7 -Wno-sign-compare \