Uh, no. The right package to install to get the files for a pre-built debian kernel is the corresponding kernel-headers package. It is not always the case that the kernel-source and kernel-patch-debian packages contain the exact kernel source that the kernel-image packages contain. Especially on non-i386 arches, the kernel-image package can contain additional patches.(If you're using the Debian pre-built kernels, you need to install the appropriate kernel-tree package to get the source tree.)
(so if you have kernel-image-2.4.27-2-386 installed, you install kernel-headers-2.4.27-2-386 and use /usr/src/kernel-headers-2.4.27-2-386 as the "kernel source" directory)
I would actually recommend the use of the module-assistant package for building modules fore pre-built kernels.
aptitude install module-assistant module-assistant update module-assistant prepare module-assistant auto-install openafs
should build and install an appropriate openafs-modules package for the running kernel.
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