Description:

The kernel-source package contains the source code files for the tmb
Linux kernel. These source files are needed to build most C programs, since
they depend on the constants defined in the source code. The source
files can also be used to build a custom kernel that is better tuned to
your particular hardware, if you are so inclined (and you know what you're
doing).

For instructions for update, see:
http://www.mandriva.com/security/kernelupdate

The tmb kernels is an experimental kernel based on the kernel.org
kernels with added patches. Some of them may/will never end up in
the main kernels due to their experimental nature. Some refer to
this kernel as a 'hackkernel' ...
Use these kernels at your own risk !!

If you want more info on the various kernel-tmb flavours, please visit:
http://www.iki.fi/tmb/Kernels/