Study to use seq proc file system
insmod hello.ko rmmod hello
after disable security boot root@lshi-750-339c:/home/lshi/Module# insmod hello.ko insmod: ERROR: could not insert module hello.ko: Invalid module format
====resolve
after add GPL and user 759.581203] hello: loading out-of-tree module taints kernel. [ 759.581257] hello: module verification failed: signature and/or required key missing - tainting kernel [ 759.581552] helloe workd form me ]
helloe bye bye form me