Date: Sat, 30 Jun 2012 21:41:40 +0200
From: Thierry Reding <thierry.reding@avionic-design.de>
To: Arnd Bergmann <arnd.bergmann@linaro.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>, linux-next@vger.kernel.org,
        linux-kernel@vger.kernel.org, Sascha Hauer <s.hauer@pengutronix.de>
Subject: Re: linux-next: build failure after merge of the final tree (pwm
 tree related)
Message-ID: <20120630194139.GA24300@avionic-0098.mockup.avionic-design.de>
References: <20120629174826.546cc991459b12833f2aaebd@canb.auug.org.au>
 <20120630181006.GC23990@avionic-0098.adnet.avionic-design.de>
 <201206301920.21158.arnd.bergmann@linaro.org>
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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.
> >=20
> > Sascha, Arnd (Cc'ed): what do you think?
> >=20
> > 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.
> >=20
> 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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