linux-kernel - Re: mmotm 2010-10-13-17-13 uploaded (leds)

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Date:	Thu, 14 Oct 2010 09:14:26 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Johannes Berg <johannes@...solutions.net>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rpurdie@...ys.net
Subject: Re: mmotm 2010-10-13-17-13 uploaded (leds)

On 10/14/10 04:38, Johannes Berg wrote:
> On Thu, 2010-10-14 at 05:29 +0100, Randy Dunlap wrote:
> 
>> When # CONFIG_LEDS_CLASS is not set
>> & CONFIG_LEDS_TRIGGERS=y:
>>
>> drivers/built-in.o: In function `led_trigger_set':
>> (.text+0x4737b): undefined reference to `led_brightness_set'
> 
> Curious. Why is that even possible?
> 
> config LEDS_CLASS
> ...
> if LEDS_CLASS
> ...
> config LEDS_TRIGGERS
> ...
> endif # LEDS_TRIGGERS
> 
> endif # LEDS_CLASS   
> ...
> 
> Are there dependencies missing? I was under the impression that this
> shouldn't be happening. And what's the point in having triggers, but
> nothing to trigger...? How about the patch below?

It seems to be due to net/mac80211/Kconfig:

config MAC80211_LEDS
	bool "Enable LED triggers"
	depends on MAC80211
	select NEW_LEDS
	select LEDS_TRIGGERS



> johannes
> 
> 
> Subject: leds: fix up dependencies
> From: Johannes Berg <johannes.berg@...el.com>
> 
> It's not useful to build LED triggers when
> there's no LEDs that can be triggered by
> them. Therefore, fix up the dependencies
> so that this cannot happen, and fix a few
> users that select triggers to depend on
> LEDS_CLASS as well (there is also one user
> that also selects LEDS_CLASS, which is OK).
> 
> As a result, we can now make everything a
> module again if desired (including the LED
> triggers, that previously could only be
> built in) -- and add back the warning in
> rt2x00's Kconfig I previously removed.
> 
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>

The patch does not apply cleanly to mmotm, but it seems
like a good plan...


-- 
~Randy
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