linux-kernel - Re: [git pull] Devicetree changes for v3.15

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Date:	Fri, 26 Sep 2014 10:19:43 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...aro.org>
Subject: Re: [git pull] Devicetree changes for v3.15

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 <grant.likely@...retlab.ca> wrote:
> 
> > Here are the dt changes I've got queued up for v3.15. The full
> > description is below in the tag. Please pull.
> (...)
> > 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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