On 15.05.23 08:43, Krzysztof Kozlowski wrote:

On 15/05/2023 06:34, Javier Carrasco wrote:

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On 14.05.23 00:38, kernel test robot wrote:

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Hi Javier,

kernel test robot noticed the following build errors:

[auto build test ERROR on ac9a78681b921877518763ba0e89202254349d1b]

url:    https://github.com/intel-lab-lkp/linux/commits/Javier-Carrasco/Input-ts-virtobj-Add-touchsreen-virtual-object-handling/20230510-215519
base:   ac9a78681b921877518763ba0e89202254349d1b
patch link:    https://lore.kernel.org/r/20230510-feature-ts_virtobj_patch-v1-3-5ae5e81bc264%40wolfvision.net
patch subject: [PATCH 3/4] Input: st1232 - add virtual touchscreen and buttons handling
config: arm-randconfig-m041-20230514 (https://download.01.org/0day-ci/archive/20230514/202305140640.VLcvhR5G-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/133c0f8c33dc5e70a72e6a7d670e133b6043a7a3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Javier-Carrasco/Input-ts-virtobj-Add-touchsreen-virtual-object-handling/20230510-215519
        git checkout 133c0f8c33dc5e70a72e6a7d670e133b6043a7a3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot [off-list ref]
| Link: https://lore.kernel.org/oe-kbuild-all/202305140640.VLcvhR5G-lkp@intel.com/ (local)

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/input/touchscreen/st1232.o: in function `st1232_ts_parse_and_report':

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st1232.c:(.text+0x148): undefined reference to `ts_virtobj_is_button_slot'
arm-linux-gnueabi-ld: st1232.c:(.text+0x15e): undefined reference to `ts_virtobj_button_press'
arm-linux-gnueabi-ld: st1232.c:(.text+0x16c): undefined reference to `ts_virtobj_mt_on_touchscreen'
arm-linux-gnueabi-ld: st1232.c:(.text+0x242): undefined reference to `ts_virtobj_mapped_buttons'
arm-linux-gnueabi-ld: st1232.c:(.text+0x266): undefined reference to `ts_virtobj_is_button_slot'
arm-linux-gnueabi-ld: st1232.c:(.text+0x276): undefined reference to `ts_virtobj_button_release'

   arm-linux-gnueabi-ld: drivers/input/touchscreen/st1232.o: in function `st1232_ts_probe':

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st1232.c:(.text+0x42c): undefined reference to `ts_virtobj_map_objects'
arm-linux-gnueabi-ld: st1232.c:(.text+0x43c): undefined reference to `ts_virtobj_mapped_touchscreen'
arm-linux-gnueabi-ld: st1232.c:(.text+0x44a): undefined reference to `ts_virtobj_get_touchscreen_abs'

   arm-linux-gnueabi-ld: st1232.c:(.text+0x520): undefined reference to `ts_virtobj_mapped_buttons'

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arm-linux-gnueabi-ld: st1232.c:(.text+0x542): undefined reference to `ts_virtobj_set_button_caps'

Apparently there is something wrong about the references from this patch
to a previous one from the same series ([PATCH 1/4] Input: ts-virtobj -
Add touchs[c]reen virtual object handling). The "url" link shows all
patches of this series in the right order though.

All these functions are declared in the linux/input/ts-virtobj.h header
and also inline-defined there if ts-virtobj is not selected. If it is
selected (either y or M), the functions are exported from
driver/input/touchscreen/ts-virtobj.c. According to the error report,
ts-virtobj was selected as a module.

I could build the kernel with the three possible configurations
(ts-virtobj y/n/M) for x86_64 as well as for arm64 with no errors or
warnings repeatedly, so I am a bit confused now. I am probably
missing something, but I do not know what.

I wonder if the new file where the functions are defined (ts-virtobj.c)
could not be found by some reason or if the test build does not like the
way I handled the function declaration/definition. Any hint or advice
would be more than welcome.

The report is correct. Build driver builtin and your virtual as module.

You are right, that was the configuration I was missing, which I
honestly did not even consider when I tested this feature.

The problem seems to be that I am using the IS_ENABLED macro which
returns true if selected as a module, but the define is in that case
CONFIG_TOUCHSCREEN_TS_VIRTOBJ_MODULE instead of
CONFIG_TOUCHSCREEN_TS_VIRTOBJ. As I am using the latter define in the
Makefile, it does not get compiled.

I am testing the IS_REACHABLE macro for the header instead, which I
think is the right one in this case and actually fixes the bug. I am
telling you that just in case I am talking nonsense to save everyone
from a pointless v2.
But first I will go through all possible combinations between my virtual
and a touchscreen driver before I submit a broken v2, where I will also
provide an improved documentation as you suggested.
Thanks a lot again!

Best regards,
Krzysztof