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notes:rebuilding_kernel_modules

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# Rebuilding Linux Kernel Modules

This page specifically concerns building kernel modules to work with an existing running kernel without having to rebuild the entire kernel or reboot the system.

There are two prerequisites for building modules to work with an existing kernel:

• The current kernel's configuration file.
• The current kernel's exported symbol list (the Modules.symvers file).

Under Ubuntu the files can be found in the following locations:

• /boot/config-$(uname -r) • /usr/src/linux-headers-$(uname -r)/Module.symvers

On Ubuntu, the latter file is located within the linux-headers-$(uname -r) package. Unzip a copy of the Linux kernel sources and change into the root directory of it. Then execute the following commands: make clean cp /boot/config-$(uname -r) .config
make modules_prepare
make modules
To only build a subset of modules set the M variable to a subdirectory — for example, to rebuild only USB audio drivers:
make M=sound/usb