[POWERPC] Create and use CONFIG_WORD_SIZE

Linus made this suggestion for the x86 merge and this starts the process
for powerpc.  We assume that CONFIG_PPC64 implies CONFIG_PPC_MERGE and
CONFIG_PPC_STD_MMU_32 implies CONFIG_PPC_STD_MMU.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 12 insertions, 9 deletions

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 87aff5372d6e..71632b20b81d 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -39,7 +39,6 @@ KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
 
 ifeq ($(CONFIG_PPC64),y)
 OLDARCH := ppc64
-SZ      := 64
 
 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
 
@@ -49,16 +48,21 @@ endif
 
 else
 OLDARCH := ppc
-SZ      := 32
+endif
+
+# It seems there are times we use this Makefile without
+# including the config file, but this replicates the old behaviour
+ifeq ($(CONFIG_WORD_SIZE),)
+CONFIG_WORD_SIZE := 32
 endif
 
 UTS_MACHINE := $(OLDARCH)
 
 ifeq ($(HAS_BIARCH),y)
-override AS     += -a$(SZ)
-override LD     += -m elf$(SZ)ppc
-override CC     += -m$(SZ)
-override AR     := GNUTARGET=elf$(SZ)-powerpc $(AR)
+override AS     += -a$(CONFIG_WORD_SIZE)
+override LD     += -m elf$(CONFIG_WORD_SIZE)ppc
+override CC     += -m$(CONFIG_WORD_SIZE)
+override AR     := GNUTARGET=elf$(CONFIG_WORD_SIZE)-powerpc $(AR)
 endif
 
 LDFLAGS_vmlinux := -Bstatic
@@ -72,7 +76,7 @@ AFLAGS		+= $(AFLAGS-y)
 CFLAGS          += -msoft-float -pipe $(CFLAGS-y)
 CPP             = $(CC) -E $(CFLAGS)
 
-CHECKFLAGS      += -m$(SZ) -D__powerpc__ -D__powerpc$(SZ)__
+CHECKFLAGS      += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
 
 ifeq ($(CONFIG_PPC64),y)
 GCC_BROKEN_VEC  := $(shell if [ $(call cc-version) -lt 0400 ] ; then echo "y"; fi)
@@ -120,8 +124,7 @@ cpu-as-$(CONFIG_E200)		+= -Wa,-me200
 AFLAGS += $(cpu-as-y)
 CFLAGS += $(cpu-as-y)
 
-head-y                          := arch/powerpc/kernel/head_32.o
-head-$(CONFIG_PPC64)            := arch/powerpc/kernel/head_64.o
+head-y                          := arch/powerpc/kernel/head_$(CONFIG_WORD_SIZE).o
 head-$(CONFIG_8xx)              := arch/powerpc/kernel/head_8xx.o
 head-$(CONFIG_40x)              := arch/powerpc/kernel/head_40x.o
 head-$(CONFIG_44x)              := arch/powerpc/kernel/head_44x.o