MIPS: Use Makefile.postlink to insert relocations into vmlinux

When relocatable support for MIPS was merged, there was no support for
an architecture to add a postlink step for vmlinux. This meant that only
invoking a target within the boot directory, such as uImage, caused the
relocations to be inserted into vmlinux. Building just the vmlinux
target would result in a relocatable kernel with no relocation
information present.

Commit fbe6e37d ("kbuild: add arch specific post-link Makefile")
recified this situation, so MIPS can now define a postlink step to add
relocation information into vmlinux, and remove the additional steps
tacked onto boot targets.
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Tested-by: Steven J. Hill <steven.hill@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14554/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Makefile

@@ -330,10 +330,6 @@ rom.bin rom.sw: vmlinux
 		$(bootvars-y) $@
 endif
 
-CMD_RELOCS = arch/mips/boot/tools/relocs
-quiet_cmd_relocs = RELOCS  $<
-      cmd_relocs = $(CMD_RELOCS) $<
-
 #
 # Some machines like the Indy need 32-bit ELF binaries for booting purposes.
 # Other need ECOFF, so we build a 32-bit ELF binary for them which we then
@@ -342,11 +338,6 @@ quiet_cmd_relocs = RELOCS  $<
 quiet_cmd_32 = OBJCOPY $@
 	cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
 vmlinux.32: vmlinux
-ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_64BIT),yy)
-# Currently, objcopy fails to handle the relocations in the elf64
-# So the relocs tool must be run here to remove them first
-	$(call cmd,relocs)
-endif
 	$(call cmd,32)
 
 #
@@ -362,9 +353,6 @@ all:	$(all-y)
 
 # boot
 $(boot-y): $(vmlinux-32) FORCE
-ifeq ($(CONFIG_RELOCATABLE)$(CONFIG_32BIT),yy)
-	$(call cmd,relocs)
-endif
 	$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
 		$(bootvars-y) arch/mips/boot/$@
 

arch/mips/Makefile.postlink

+# ===========================================================================
+# Post-link MIPS pass
+# ===========================================================================
+#
+# 1. Insert relocations into vmlinux
+
+PHONY := __archpost
+__archpost:
+
+include include/config/auto.conf
+include scripts/Kbuild.include
+
+CMD_RELOCS = arch/mips/boot/tools/relocs
+quiet_cmd_relocs = RELOCS $@
+      cmd_relocs = $(CMD_RELOCS) $@
+
+# `@true` prevents complaint when there is nothing to be done
+
+vmlinux: FORCE
+	@true
+ifeq ($(CONFIG_RELOCATABLE),y)
+	$(call if_changed,relocs)
+endif
+
+%.ko: FORCE
+	@true
+
+clean:
+	@true
+
+PHONY += FORCE clean
+
+FORCE:
+
+.PHONY: $(PHONY)