6.4. SMP symbols
Besides the checksum mentioned above, the symbol version prefix contains "smp" if the symbol is defined in or referenced by code that was built for symmetric multiprocessing (SMP) machines. That means it was built for use on a system that may have more than one CPU. You choose whether to build in SMP capability or not via the Linux kernel configuration process (make config , etc.), to wit with the CONFIG_SMP configuration option.
So if you use symbol versioning, you will get unresolved symbols if the base kernel was built with SMP capability and the LKM you're inserting was not, or vice versa.
If you don't use symbol versioning, never mind.
Note that there's generally no reason to omit SMP capability from a kernel, even if you have only one CPU. Just because the capability is there doesn't mean you have to have multiple CPUs. However, there are some machines on which the SMP-capable kernel will not boot because it reaches the conclusion that there are zero CPUs!
* License
