linux-kernel - Re: linux-next: Tree for Mar 31 (build failures and culprits)

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Message-ID: <20150401080806.GY24899@n2100.arm.linux.org.uk>
Date:	Wed, 1 Apr 2015 09:08:06 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Lad@...ck-us.net,
	Prabhakar <prabhakar.csengg@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Mack <daniel@...que.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Thierry Reding <treding@...dia.com>
Subject: Re: linux-next: Tree for Mar 31 (build failures and culprits)

On Tue, Mar 31, 2015 at 07:17:36PM -0700, Guenter Roeck wrote:
> On 03/31/2015 04:07 PM, Greg Kroah-Hartman wrote:
> >You need 3.17 kernel headers to have memfd_create, not much the kdbus
> >test code can do about that.  You might want to update the kernel
> >headers for these build boxes.
> >
> 
> Seems there are brand-new requirements for kernel builds. The toolchain determines
> the headers used, not the native kernel (which, FWIW, is 3.19). You might want
> to document somewhere that "allmodconfig" and possibly "allyesconfig" now only
> builds if the toolchain is based on 3.17+ kernel headers.
> 
> I think I'll just drop those allmodconfig builds instead, or find a means to drop
> the samples/kdbus builds. Sorry, my time is limited. Building toolchains costs a
> lot of time, which I simply don't have. Keep in mind that I am doing all this on
> my own spare time. You are putting a lot of burden on people doing test builds.

You _can_ avoid it by seeding those configurations.  You place the
options you want to force to a specific value in a file, and then
do:

make allmodconfig KCONFIG_ALLCONFIG=seed-config-file

So, to turn off samples:

CONFIG_SAMPLES=n

in seed-config-file.  Hence, you can still do an allmodconfig build but
without building the samples subdir.

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