cc1: error: arch/um/include/uapi: No such file or directory

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b29482fde649c72441d5478a4ea2c52c56d97a5e
commit: c348c16305280fe3e6c1186378f96c8634c149f9 lib: make a test module with set/clear bit
date:   6 days ago
config: um-allmodconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        git checkout c348c16305280fe3e6c1186378f96c8634c149f9
        # save the attached .config to linux build tree
        make W=1 ARCH=um 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> cc1: error: arch/um/include/uapi: No such file or directory [-Werror=missing-include-dirs]
cc1: all warnings being treated as errors

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Attachment: .config.gz
Description: application/gzip