Subject: [PATCH 1/4] powerpc: use the new post-link pass to check relocations

From: Nicholas Piggin <[email-masked]>
Date: Sat, 26 Nov 2016 14:26:09 +1100

Currently powerpc has to introduce a dependency on its default
build target zImage in order to run a relocation check pass
over the linked vmlinux. This is deficient because the check
is not run if the plain vmlinux target is built, or if one of
the other boot targets is built.

Switch to using the kbuild post-link pass in order to run this
check. In future powerpc will use this to do more complicated
operations, but initially using it for something simple is a
good first step.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/Makefile          | 11 -----------
 arch/powerpc/Makefile.postlink | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 11 deletions(-)
 create mode 100644 arch/powerpc/Makefile.postlink

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 8828807..868b9ec 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -270,17 +270,6 @@ PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)
 
 boot := arch/$(ARCH)/boot
 
-ifeq ($(CONFIG_RELOCATABLE),y)
-quiet_cmd_relocs_check = CALL    $<
-      cmd_relocs_check = $(CONFIG_SHELL) $< "$(OBJDUMP)" "$(obj)/vmlinux"
-
-PHONY += relocs_check
-relocs_check: arch/powerpc/relocs_check.sh vmlinux
-	$(call cmd,relocs_check)
-
-zImage: relocs_check
-endif
-
 $(BOOT_TARGETS1): vmlinux
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 $(BOOT_TARGETS2): vmlinux
diff --git a/arch/powerpc/Makefile.postlink b/arch/powerpc/Makefile.postlink
new file mode 100644
index 0000000..8c0170e
--- /dev/null
+++ b/arch/powerpc/Makefile.postlink
@@ -0,0 +1,34 @@
+# ===========================================================================
+# Post-link powerpc pass
+# ===========================================================================
+#
+# 1. Check that vmlinux relocations look sane
+
+PHONY := __archpost
+__archpost:
+
+include include/config/auto.conf
+include scripts/Kbuild.include
+
+quiet_cmd_relocs_check = CHKREL  $@
+      cmd_relocs_check = $(CONFIG_SHELL) $(srctree)/arch/powerpc/relocs_check.sh "$(OBJDUMP)" "$@"
+
+# `@true` prevents complaint when there is nothing to be done
+
+vmlinux: FORCE
+	@true
+ifdef CONFIG_RELOCATABLE
+	$(call if_changed,relocs_check)
+endif
+
+%.ko: FORCE
+	@true
+
+clean:
+	@true
+
+PHONY += FORCE clean
+
+FORCE:
+
+.PHONY: $(PHONY)
-- 
2.10.2