linux-kernel - Re: 5ada28bf76752 causes compilation error if !CONFIG_LEDS

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Date:	Thu, 18 Nov 2010 09:24:54 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	"Berg, Johannes" <johannes.berg@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 5ada28bf76752 causes compilation error if !CONFIG_LEDS_CLASS

On Tue 16-11-10 17:41:33, Berg, Johannes wrote:
> > it seems that your patch (5ada28bf76752e33dce3d807bf0dfbe6d1b943ad)
> > causes the following compilatation error:
> >   LD      .tmp_vmlinux1
> > drivers/built-in.o: In function `led_trigger_set':
> > drivers/leds/led-triggers.c:116: undefined reference to
> > `led_brightness_set'
> > make[1]: *** [.tmp_vmlinux1] Error 1
> > 
> > AFAICS, led_brightness_set is defined in drivers/leds/led-class.c which
> > is compiled only if CONFIG_LEDS_CLASS is configured which is not my
> > case (after make oldconfig with all default values from 37-rc1).
> > 
> > I am not sure what is the right solution whether CONFIG_LEDS_TRIGGERS
> > should depend on CONFIG_LEDS_CLASS or the patch should be reverted.
> > 
> > My config is attached, if somebody need it.
> 
> Hmm, we did find that, and I made a patch to fix up the Kconfig, that apparently hasn't made it in? Bit confused now.

Does this mean that I should enable CONFIG_LEDS_CLASS to work around the
issue for this moment?

> 
> johannes
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-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
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