How to Install Kernel 5.12 From Source on Fedora 31

Configuring

3. 3. Downloading Linux Kernel

   Download Linux Kernel 5.12 Source Code for Fedora GNU/Linux

   Linux Kernel 5.12 tar.xz Archive

   Downloading Linux Kernel 5.12 for Fedora

   Grab the tar.xz or tar.gz Archive from the List.
   If uncertain about what is a safe choice then opt for the latest Longterm release.

4. 4. Extracting Linux Kernel Archive

   Then Extract Linux Kernel into the target Directory
   First, access it:

   cd ~/kernel

   Then to untar the downloaded Kernel Source into the current Folder run:

   tar -xafv ~/Downloads/linux*.tar.xz

   Or in case of a tar.gz Archive use instead:

   tar -xvzf ~/Downloads/linux*.tar.gz

5. 5. Configuring Kernel

   So now to Configure Fedora Linux Custom Kernel
   First, access the Kernel Source with:

   cd linux*

   Then copy the current Configuration File into the New Kernel Source:

   sudo find /boot/ \( -iname "*config*" -a -iname "*`uname -r`*" \) -exec cp -i -t ./ {} \;

   mv *`uname -r`* .config

   This mystics because the default Configuration File may have a variable composition including “config” and the Kernel Version.
   In case of a Chrooted System instead you may look up the available Kernels with:

   ls /boot | grep config

   The grep Command refine the output List showing only the entries Matching the Keyword.
   Again fix the Configuration File editing it with nano and commenting out like:

   sudo nano .config

   Again if needed then fix the Configuration File editing it with nano and commenting out the Line like:

   #CONFIG_SYSTEM_TRUSTED_KEYS

   Ctrl+x to Save & Exit.
   Else to make a Custom one then reconfigure the Kernel (Only for advanced Users) with:

   sudo make menuconfig

   For instructions see: How to Configure a Build Kernel.