On Fri, 2023-02-17 at 19:30 +0800, kernel test robot wrote: [...] > > > ERROR: modpost: "aescfb_encrypt" [drivers/char/tpm/tpm.ko] > > > undefined! > > > ERROR: modpost: "aescfb_decrypt" [drivers/char/tpm/tpm.ko] > > > undefined! Ard, This happens because your aescfb_encrypt/decrypt() routines are missing EXPORT_SYMBOL statements. Regards, James