On Thu, 25 Sep 2014 10:49:33 +0530, Arjun Pandey said: > Step 1 goes through fine. The module gets compiled fine. > However now when i try to compile the kernel i get linker error of > undefined reference to the function exported from the kernel module. > > I can't find any documentation on this usecase.
In general, things that are built-into the kernel with CONFIG_FOO=y are *not* allowed or able to reference symbols that are in a module. This is because a module can potentially not be loaded (consider system boot before you're up far enough to do a modprobe, as an important special case), at which point trying to call the non-existent module gets you an oops or panic. So you can't find any doc on it because it's not supported.
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