linux-kernel - Re: linux-next: build warnings after merge of the kbuild-current tree

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Message-ID: <1286365363.4281.5.camel@e102109-lin.cambridge.arm.com>
Date:	Wed, 06 Oct 2010 12:42:43 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnaud Lacombe <lacombar@...il.com>
Subject: Re: linux-next: build warnings after merge of the kbuild-current
 tree

On Wed, 2010-10-06 at 12:13 +0100, Michal Marek wrote:
> On 6.10.2010 02:44, Stephen Rothwell wrote:
> > After merging the kbuild-current tree, today's (and yesterday's)
> > linux-next build (x86_64 allmodconfig and other builds as well) produced
> > these warnings:
> >
> > warning: [...] selects I2C_ALGOBIT which has unmet direct dependencies (I2C && !I2C_HELPER_AUTO)
> > [...]
> > warning: [...] selects VIDEO_TVAUDIO which has unmet direct dependencies (MEDIA_SUPPORT && VIDEO_CAPTURE_DRIVERS && !VIDEO_HELPER_CHIPS_AUTO && VIDEO_V4L2 && I2C)
> >
> > After reverting commit ff5ff6060bf880aac233e68dd666cbe9e39ec620
> > ("kconfig: delay symbol direct dependency initialization") it produces no
> > such warnings.
> 
> I'm aware of them. I'm talking with Jean Delvare about fixing the I2C
> warnings, see http://lkml.org/lkml/2010/10/5/83. The drivers/media/video
> warnings will need the same care. I don't know if we manage to fix these
> in time, so maybe the kconfig fix will have to way for 2.6.36.1.

The kconfig commit ff5ff6060 fixes a bug with commit 246cf9c26 which was
using some structures after they were freed. Because of the bug, it just
happened that it wasn't showing these kconfig warnings. A worst thing is
kbuild segfaulting or getting into an infinite loop (as reported/fixed
by Arnaud).

I think the above commit is still needed before 2.6.36 and maybe push a
drivers/media/video warnings in 2.6.36.1.

Thanks.

-- 
Catalin

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