Kernel/Rebuild/it

Common
Exit the kernel configuration and rebuild the kernel using the following command:

Do not forget to copy the newly compiled kernel image to the location. If applicable mount.

If necessary, update the boot loader
When not changing kernel versions, it may not be necessary to update the system's boot loader. This depends on the system configuration; if the boot loader is pointed to a replaced binary file with the exact same name, secondary boot loader entries may not need updated. When in doubt re-run the boot loader configuration generator or inspect the boot loader's configuration file to avoid issues the next time the system reboots.

Using GRUB2
Update the boot loader configuration prior to rebooting the system. For instance, when using GRUB2, these steps can be done by running the following command:

Using EFI stub kernel
Users of EFI stub follow the procedure in the Installation section.

Using systemd-boot
If using systemd's EFI bootloader, review the systemd-boot article.

Reboot
Reboot for the new kernel configuration to take effect: