Re: [PATCH 0/4 v3 net-next] tg3: Add hwmon support

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Mon, 2012-07-16 at 23:11 -0700, David Miller wrote:
> From: "Michael Chan" <mchan@broadcom.com>
> Date: Mon, 16 Jul 2012 19:23:58 -0700
> 
> > David, I've removed the binary sysfs attribute and now use
> > hwmon only.  Please consider this patchset for net-next.
> 
> Applied, thanks Michael.
> 
> You might want to add some Kconfig logic so that it's easier
> to get the hwmon stuff automatically when tg3 is selected.

Right, just got bitten by that one with one of my test configs:

CONFIG_TIGON3=y
CONFIG_HWMON=m

results in:

drivers/built-in.o: In function `.tg3_close':
tg3.c:(.text+0x1ab664): undefined reference to `.hwmon_device_unregister'
drivers/built-in.o: In function `.tg3_hwmon_open':
tg3.c:(.text+0x1b153c): undefined reference to `.hwmon_device_register'

I hit a similar one a while back with some DRM driver, there's no
nice way to solve them afaik, other than basically forcing HWMON to
y if TIGON3 is enabled. Either that, or having TIGON3's hwmon support
be a sub-option itself dependent on CONFIG_HWMON & potentially build
as a separate module etc... quite a pain.

Cheers,
Ben.