linux-kernel - Re: linux-next: build failure after merge of the final tree (pwm tree related)

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Message-ID: <20120630194139.GA24300@avionic-0098.mockup.avionic-design.de>
Date:	Sat, 30 Jun 2012 21:41:40 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Arnd Bergmann <arnd.bergmann@...aro.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: linux-next: build failure after merge of the final tree (pwm
 tree related)

On Sat, Jun 30, 2012 at 07:20:21PM +0000, Arnd Bergmann wrote:
> On Saturday 30 June 2012, Thierry Reding wrote:
> > I hadn't thought about the allyesconfig case yet. Adding a "depends on
> > !HAVE_PWM" to the PWM symbol should work and is the easiest fix to this
> > kind of problem while other PWM legacy API implementations are ported to
> > the PWM subsystem.
> > 
> > Sascha, Arnd (Cc'ed): what do you think?
> > 
> > I don't know if I'll get enough time to test this over the weekend but I
> > should get to it when I'm back in the office on Monday.
> > 
> You cannot depend on a symbol in the same place that provides it -- that
> would be a recursive dependency (or a paradox).

The PWM symbol doesn't provide HAVE_PWM.

> I think that all the drivers that are not converted to the common PWM
> layer yet should depend on not enabling the common code. Once they
> are all moved over, that dependency will go away.

Right. That's exactly what I meant. If we add depends on !HAVE_PWM to
the PWM symbol that should result in both options conflicting, and
therefore not being built at the same time.

Thierry

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