"copy_to_user" function not working in stable build "2.6.36.4"

[zubraz singha]

Hey Guys,
While writing a read proc entry for Linux kernel (version 2.6.36.4), I
found that the kernel function "copy_to_user" is not working properly.
The kernel function used internally by "copy_to_user" i.e.
"__copy_to_user" works fine and also this same function "copy_to_user"
works quite well on the higher kernel versions,  I tried it on Linux
kernel version 3.14.  The kernel source code for  "2.6.36.4" doesn't
have a definition for a function i.e "_copy_to_user",  which is being
called internally by "copy_to_user". However the function
"_copy_to_user" has a definition  in higher version kernels like 3.14
etc. I cannot update my kernel,  Is there any way I can fix this issue
by manually patching the kernel. There are two possible ways in which
I think it can be solved.

- Write a definition for the _copy_to_user in "2.6.36.4", which will
have the same "access_ok" check and corresponding  "__copy_to_user"
function call.
- Modifying the function "copy_to_user" and adding the "access_ok"
check and the "__copy_to_user" function.

Zubraj
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