Linus,

On Fri, Sep 26, 2014 at 02:30:53PM +0200, Linus Walleij wrote:

On Tue, Apr 1, 2014 at 12:15 PM, Grant Likely [off-list ref] wrote:

quoted

Here are the dt changes I've got queued up for v3.15. The full
description is below in the tag. Please pull.

(...)

quoted

Jason Cooper (1):
      kbuild: dtbs_install: new make target

Exact patch is:

  f4d4ffc03efc kbuild: dtbs_install: new make target

After this patch a while back I have observed the following behaviour
of the kernel build:

make zImage
make zImage
-> incremental build, just relink

make zImage
make dtbs
make zImage
-> The whole kernel gets rebuilt

So now if I happen to recompile my device trees, I suddenly want
the entire zImage to be rebuilt to? It's by definition not changes that
affect the kernel build :-(

I noticed this because my build scripts calls make dtbs && make zImage,
and started to rebuild absolutely everything all the time.

Do you think this can be fixed? It's quite simple to reproduce...

Does the attached fix your problem?

thx,

Jason.

----------->8------------------------------------------

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 0ce9d0f71f2a..a88b13af58d2 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile

@@ -313,7 +313,9 @@ $(INSTALL_TARGETS):
 	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
 
 PHONY += dtbs dtbs_install
-dtbs dtbs_install: prepare scripts
+dtbs: scripts
+	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $@
+dtbs_install: prepare scripts
 	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $@
 
 # We use MRPROPER_FILES and CLEAN_FILES now
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