Dear all,

I'm trying to implement simple network protocol. I'm mapping user pages with get_user_pages() and then accessing them with kmap(),kunmap(). Touching user pages works fine in syscall context, but fails with nasty kboom in a softirq context. I also tried kmap_atomic()/kunmap_atomic(). Am I doing something wrong, or I'm not allowed to access user structures at all from irq/softirq context. ( copy_to_user() also is limited to syscall context). Any help will be appreciated.

Thanks
Ivan