On Fri 2021-02-12 13:38:58, Linus Walleij wrote:
> I need Arnds help with this...
> 
> On Fri, Feb 12, 2021 at 12:05 AM kernel test robot <lkp@intel.com> wrote:
> 
> >    ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_v4l2_flash_release':
> > >> drivers/leds/flash/leds-rt8515.c:216: undefined reference to `v4l2_flash_release'
> >    ld: drivers/leds/flash/leds-rt8515.o: in function `rt8515_probe':
> >    drivers/leds/flash/leds-rt8515.c:354: undefined reference to `v4l2_flash_init'
> 
> So the problem is that this is compiled in, so CONFIG_LEDS_RT8515=y
> (it is tristate so can also be a module)
> but it depends on symbols from a module:
> CONFIG_V4L2_FLASH_LED_CLASS=m.
> 
> In the code I try to only support the V4L2 interface when using V4L2:
> #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> (... V4L2 code...)
> 
> Is there a way to define in Kconfig that if and only if you enable
> this other module it has to follow the y or m that we use for this
> driver?
> 
> Or do I simply have to bite the bullet, make it bool and
> depend on CONFIG_V4L2_FLASH_LED_CLASS || !CONFIG_V4L2_FLASH_LED_CLASS
> ?

Arnd already submitted patch for this one... depends is right, no need
to make it bool, I believe.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek