Re: linux-next bad Kconfig for drivers/hid

On Thu, 8 Dec 2011, Jeremy Fitzhardinge wrote:

quoted

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"?

How about making it 'default POWER_SUPPLY' instead?

I somehow feel that we'd rather avoid too much 'default y's.

Thanks,

-- 
Jiri Kosina
SUSE Labs