Hi Javier
Am 16.09.24 um 10:36 schrieb Javier Martinez Canillas:
Thomas Zimmermann <tzimmermann@xxxxxxx> writes:
Hello Thomas and Tzung-Bi,
Hi
Am 15.09.24 um 09:44 schrieb kernel test robot:
Hi Javier,
kernel test robot noticed the following build errors:
[auto build test ERROR on chrome-platform/for-next]
[also build test ERROR on chrome-platform/for-firmware-next linus/master v6.11-rc7 next-20240913]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Javier-Martinez-Canillas/firmware-coreboot-Don-t-register-a-pdev-if-screen_info-data-is-present/20240914-053323
base: https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next
patch link: https://lore.kernel.org/r/20240913213246.1549213-1-javierm%40redhat.com
patch subject: [PATCH v3] firmware: coreboot: Don't register a pdev if screen_info data is present
config: riscv-randconfig-001-20240915 (https://download.01.org/0day-ci/archive/20240915/202409151528.CIWZRPBq-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240915/202409151528.CIWZRPBq-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409151528.CIWZRPBq-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
ld.lld: error: undefined symbol: screen_info
>>> referenced by framebuffer-coreboot.c:27 (drivers/firmware/google/framebuffer-coreboot.c:27)
>>> drivers/firmware/google/framebuffer-coreboot.o:(framebuffer_probe) in archive vmlinux.a
>>> referenced by framebuffer-coreboot.c:27 (drivers/firmware/google/framebuffer-coreboot.c:27)
>>> drivers/firmware/google/framebuffer-coreboot.o:(framebuffer_probe) in archive vmlinux.a
Not all platforms define screen_info. Maybe fix this by following
Yes, after reading the build errors reported by the robot I remembered
that we had similar issues with sysfb, for example commit 1260b9a7020
("drivers/firmware: fix SYSFB depends to prevent build failures") fixed
one of those.
Tzung-Bi's advice of removing the local variables and then guard the
test by CONFIG_SYSFB. If SYSFB has been defined, screen_info has to be
there. It's not a super pretty solution, though.
If possible I would prefer to avoid the ifdefery in the driver. I also
believe that the local variables makes the code easier to read. But if
you folks think that's better to drop them, I can do it in the next rev.
Another option is to restrict the architectures where this driver could
be build. As far as I understand it is mainly for x86 and ARM64 arches.
These two have a screen_info defined so the driver will build correctly.
I can include a preparatory patch that adds a "depends on x86 || ARM64".
That feels arbitrary, as the dependency is not really in coreboot, but
in sysbf. What you'd want is a HAVE_SCREEN_INFO define on the
architectures that provide it. IIRC earlier attempts to add this have
failed. :/
If you don't want the ifdef-ery in coreboot.c, you could add a helper to
sysfb. Let's say
bool sysfb_handles_screen_info(void)
returns the result of the test. If you put it next to sysfb_disable(),
you could add an empty wrapper into the sysfb.h header as well. [1]
(There's still the possibility that screen_info is available, but sysfb
has been disabled. But that's not different from how it currently works.)
[1]
https://elixir.bootlin.com/linux/v6.10.10/source/include/linux/sysfb.h#L65
Best regards
Thomas
Best regards
Thomas
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
