linux-kernel - Re: running "make dtbs" for test builds

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Date:	Mon, 18 Jul 2016 14:52:32 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Fengguang Wu <lkp@...el.com>, devicetree@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: running "make dtbs" for test builds

On Monday, July 18, 2016 8:41:22 PM CEST Fengguang Wu wrote:
> Hi Arnd,
> 
> On Mon, Jul 18, 2016 at 02:01:17PM +0200, Arnd Bergmann wrote:
> >Hi Fengguang,
> >
> >I've recently run into a number of cases in which I pulled a branch that
> >was building fine with "make vmlinux", but that failed for "make dtbs",
> >and I wonder if this is something that could be checked by the kbuild
> >test robot so we catch it earlier.
> 
> We initially run "make" without vmlinux, however during bisect more
> specific make targets will be used to speed it up. To do that it's
> necessary to know the regex patterns of "make dtbs" error messages,
> so that they can be correctly bisected.
> 
> Can you give some "make dtbs" error messages or patterns?
> 

A typical error looks like

Error: arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dts:252.1-18 Label or path usb_power_supply not found
FATAL ERROR: Syntax error parsing input tree
scripts/Makefile.lib:312: recipe for target 'arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dtb' failed
make[3]: *** [arch/arm/boot/dts/sun7i-a20-bananapi-m1-plus.dtb] Error 1

There should be almost 100% correlation between seeing "arch/${ARCH}/boot/dts/"
in stderr and having a problem in the "make dtbs" stage.

	Arnd