On Wed, Oct 27, 2021 at 02:07:19PM +0800, kernel test robot wrote:
> Hi "Maíra,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on media-tree/master]
> [also build test ERROR on v5.15-rc7 next-20211026]
> [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]
> 
> url:    https://github.com/0day-ci/linux/commits/Ma-ra-Canal/media-rc-pwm-ir-tx-Switch-to-atomic-PWM-API/20211024-183502
> base:   git://linuxtv.org/media_tree.git master
> config: riscv-randconfig-r004-20211027 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5db7568a6a1fcb408eb8988abdaff2a225a8eb72)
> 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
>         # install riscv cross compiling tool for clang build
>         # apt-get install binutils-riscv64-linux-gnu
>         # https://github.com/0day-ci/linux/commit/abea850df0b6436083fcaa097ad3029a27aa62bb
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Ma-ra-Canal/media-rc-pwm-ir-tx-Switch-to-atomic-PWM-API/20211024-183502
>         git checkout abea850df0b6436083fcaa097ad3029a27aa62bb
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> ERROR: modpost: "__udivdi3" [drivers/media/rc/pwm-ir-tx.ko] undefined!

This comes from the line:

	state.duty_cycle = DIV_ROUND_CLOSEST(pwm_ir->duty_cycle * state.period, 100);

where DIV_ROUND_CLOSEST expands to a normal division but state.period is
a u64. So this should use DIV64_U64_ROUND_CLOSEST I guess.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |