linux-kernel - Re: 3.9-rc1 regression in arm dtb build

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Message-ID: <20130328195456.GA22527@quad.lixom.net>
Date:	Thu, 28 Mar 2013 12:54:56 -0700
From:	Olof Johansson <olof@...om.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	kernel list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 3.9-rc1 regression in arm dtb build

On Thu, Mar 28, 2013 at 08:33:23PM +0100, Pavel Machek wrote:
> On Thu 2013-03-28 08:49:20, Stephen Warren wrote:
> > On 03/28/2013 03:29 AM, Pavel Machek wrote:
> > ...
> > > There's change that makes it pretty much impossible to build dtbs
> > > reliably between different kernel versions, because it leaves old dtbs
> > > around, and they survive even make clean.
> > 
> > One question here: Presumably the dtbs don't survive "make clean" if you
> > run that right after building the dtbs, but only if you check out a new
> > kernel version before running clean? Or is that not the case?
> 
> That was the case I seen, yes.
> 
> Have old kernel running, dtbs building. Apply a patch. It starts
> behaving weird. You do make clean... but you still get old dtbs.
> 
> (It would be nice if make socfpga_cyclone5.dtb would magically remove
> all the dtbs from old location; make dtbs does that if I understand
> stuff correctly).


This takes care of the "make dtbs" case (or just "make" case), but not
when you build a specific target.




ARM: dts: remove stale dtb files from arch/arm/boot

This will result in stale dtb files being removed from arch/arm/boot, which
can cause confusion when someone goes from an older kernel version to a newer
one without doing make clean on the old version (or git clean -f -d -x).


Signed-off-by: Olof Johansson <olof@...om.net>

index 84aa2ca..b1127b8 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -115,4 +115,5 @@ i:
 	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
 	$(obj)/Image System.map "$(INSTALL_PATH)"
 
+clean-files := *.dtb
 subdir-	    := bootp compressed dts
--
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