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Subjectmsgsnd in module

Hi,
I am inserting a module(device driver) using insmod.
I want to send a message from this module to an user process.
For this I used msgsnd with buffer in the call as a local
variable. I am getting an error "EFAULT" for this call.
However this did not happen when I made the driver code as a
part of kernel and not as a module. Any idea about what could
be the problem and how to solve it?

TIA

Regards,
Vijayalakshmi

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