Hi Desmond,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20210813]
[also build test ERROR on v5.14-rc5]
[cannot apply to linus/master v5.14-rc5 v5.14-rc4 v5.14-rc3]
[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/Desmond-Cheong-Zhi-Xi/drm-avoid-races-with-modesetting-rights/20210815-234145
base:    4b358aabb93a2c654cd1dcab1a25a589f6e2b153
config: i386-randconfig-a004-20210815 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/cf6d8354b7d7953cd866fad004cbb189adfa074f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Desmond-Cheong-Zhi-Xi/drm-avoid-races-with-modesetting-rights/20210815-234145
        git checkout cf6d8354b7d7953cd866fad004cbb189adfa074f
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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: "task_work_add" [drivers/gpu/drm/drm.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org