Mechnism for sharing data between kernel and user space

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Hi All,

I am exploring the mechanism for sharing data between kernel and user space. There are following mechanism I have found
  1. copy_to_user/copy_from_user
  2. Netlink sock
  3. /proc, /debugfs etc.
Other than this, Is there any efficient way of which I could read/write linked-list that I have created from my kernel module.

---
Jitendra

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