1. install ubuntu 21.10\r
-2. apt-get install build-essential flex ncurse linux-headers-generic linux-source ...... and so on\r
+2. apt-get install build-essential flex libncurses-dev linux-headers-generic linux-source libssl-dev ...... and so on\r
3. cp /lib/modules/5.13.0-23-generic/build/Module.symvers ./\r
4. /boot/config-5.13.0-23-generic as .config make oldconfig\r
5. make menuconfig \r
6. modify ./scripts/mod/modpost.c\r
1. skip add_srcversion (just return)\r
2. force add_retpoline (#ifdef --> #ifndef)\r
+ 3. force add_intree_flag\r
\r
7. make modules_prepare LOCALVERSION=-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r
\r