linux-kernel - Re: linux-next bad Kconfig for drivers/hid

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Date:	Fri, 9 Dec 2011 11:00:00 -0800
From:	"Randy Dunlap" <rdunlap@...otime.net>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Jiri Kosina" <jkosina@...e.cz>,
	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	"LinuxPPC-dev" <linuxppc-dev@...ts.ozlabs.org>,
	"Linux Kernel ML" <linux-kernel@...r.kernel.org>
Subject: Re: linux-next bad Kconfig for drivers/hid


On Thu, December 8, 2011 9:33 pm, Jeremy Fitzhardinge wrote:
> On 12/08/2011 05:27 PM, Tony Breeds wrote:
>> Commit 4f5ca836bef3 (HID: hid-input: add support for HID devices
>> reporting Battery Strength) went into linux-next on Dec 1st since then a
>> ppc6xx_defconfig has been failing with:
>>
>> ---
>> drivers/built-in.o: In function `hidinput_cleanup_battery':
>> /scratch/tony/working/drivers/hid/hid-input.c:351: undefined reference
>> to `power_supply_unregister'
>> drivers/built-in.o: In function `hidinput_setup_battery':
>> /scratch/tony/working/drivers/hid/hid-input.c:338: undefined reference
>> to `power_supply_register'
>> make[1]: *** [.tmp_vmlinux1] Error 1
>> ---
>>
>> http://kisskb.ellerman.id.au/kisskb/buildresult/5012563/
>> vs
>> http://kisskb.ellerman.id.au/kisskb/buildresult/5017366/
>>
>> The defconfig in question doens't mention either option
>> (CONFIG_POWER_SUPPLY or CONFIG_HID_BATTERY_STRENGTH) and kbuild is
>> genertaing
>> CONFIG_HID_BATTERY_STRENGTH=y
>> CONFIG_POWER_SUPPLY=m
>> which clearly isn't going to work.
>>
>> The following change to HID_BATTERY_STRENGTH Kconfig "works" but seems a
>> little gross.
>>
>> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
>> index 5ed64f6..d2a94e6 100644
>> --- a/drivers/hid/Kconfig
>> +++ b/drivers/hid/Kconfig
>> @@ -33,7 +33,7 @@ config HID
>>
>>  config HID_BATTERY_STRENGTH
>>         bool
>> -       depends on POWER_SUPPLY
>> +       depends on POWER_SUPPLY=y
>>         default y
>>
>>  config HIDRAW
>>
>> Any chance we can get a fix into linux-next?
>
> Hm.  How about making it "depends on HID && POWER_SUPPLY"?  I think that
> would needlessly disable it if HID is also modular, but I'm not sure how
> to fix that.  "depends on HID && POWER_SUPPLY && HID == POWER_SUPPLY"?

The last suggestion looks good to me.

-- 
~Randy

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