Updating variable shared between user and kernel space

[Kristian Evensen <kristian.evensen@gmail.com>]

Hello,

I have a value I would like to share between userspace and kernelspace
(it is store in my target struct and intialized in the user space part
of my module), but when I update it in kernel space it gets the wrong
value. When for example incrementing the value by 1 every time the
rule matches, the values are all messed up (but never larger than the
number of matches/increments). When creating and initializing the
value in the module, it behaves correctly.

I always though that if you try to accesses userspace varibles from
kernel space, you will get a seg. fault or similar, and am therefore a
little confused as to why this do not work. Does anybody know why
and/or how to share variables?

-Kristian