Re: [PATCH] staging: bcm2835: fix vchiq_mmal dependencies

On Fri, Dec 4, 2020 at 11:44 AM Jacopo Mondi [off-list ref] wrote:

Hi Arnd,

On Thu, Dec 03, 2020 at 11:38:30PM +0100, Arnd Bergmann wrote:

quoted

From: Arnd Bergmann <arnd@arndb.de>

When the MMAL code is built-in but the vchiq core config is
set to =m, the mmal code never gets built, which in turn can
lead to link errors:

My bad, I repetedly ignored the error report received from the 'kernel
test robot' about this. Thanks for fixing.

For my eduction, why would the vchiq-mmal code not get build if
vchiq-core is set to M ? I mean, that configuration is indeed wrong,
as vchiq-mmal uses symbols from vchiq-core and I would expect that to
fail when building the kernel image, not have the other modules (as
bcm2835-camera) fail as a consequence when building modules.

drivers/staging/Makefile has this line:

obj-$(CONFIG_BCM2835_VCHIQ)     += vc04_services/

when CONFIG_BCM2835_VCHIQ=m, the kbuild infrastructure
only enters the subdirectory while building modules, but a built-in
mmal driver is not a loadable module, so it does not get built
at that time. When compiling the built-in code, the subdirectory is
not entered.

quoted

Fixes: b18ee53ad297 ("staging: bcm2835: Break MMAL support out from camera")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Acked-by: Jacopo Mondi <jacopo@jmondi.org>

If you noticed this from the same error notification I recevied it
might be fair to report:
Reported-by: kernel test robot <redacted>

I had not seen that report but found it during my own testing,
thanks for adding.

      Arnd

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