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

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Date:	Tue, 3 Jul 2012 10:23:54 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd.bergmann@...aro.org>
Cc:	Thierry Reding <thierry.reding@...onic-design.de>,
	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 9:20 PM, Arnd Bergmann <arnd.bergmann@...aro.org> 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).
>
> 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.

Hence you cannot have a single kernel image that contains both legacy and new
drivers. I don't know whether there's any such combination that makes sense,
though.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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