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How to call a function defined in a kernel module (LKM) from kernel code?

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http://stackoverflow.com – I am newbie on Kernel Development techniques. I was wondering if there is a way to establish communication between Kernel and Kernel Modules (LKM), once Kernel Modules are dynamically loaded. What I want to do is to call a function from a specific part of the Kernel to send some data, while the kernel module is waiting for it. If the module isn't loaded yet, I was thinking it would cause some trouble because the function isn't yet defined too. So my question is, there is a way of call a function defined on kernel module from somewhere on the kernel? I couldn't find any sources for this questio (HowTos)