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 fbe6e37dab97 ("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>

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 0f6e95c..06d7958 100644 (file)
--- a/arch/mips/Makefile
+++ b/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) \
                $(bootvars-y) arch/mips/boot/$@
 

diff --git a/arch/mips/Makefile.postlink b/arch/mips/Makefile.postlink
new file mode 100644 (file)
index 0000000..b0ddf07
--- /dev/null
+++ b/arch/mips/Makefile.postlink
@@ -0,0 +1,35 @@
+# ===========================================================================
+# 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)