Can I call kthread_should_stop() fromuser-space tasks?

[Frank Heckenbach]

Hi,

is it permissible to call kthread_should_stop() from normal
user-space tasks (looking at kthread.c I suppose not), and if not,
is there a way to find out whether the current task is a kthread?

Reason I'm asking, I have a function that's called from both
kthreads and user-space tasks which calls
wait_event_interruptible(). If it's a kthread I want to add
"|| kthread_should_stop()" to the condition so it can be stopped
with kthread_stop() while waiting, but of course I don't want to
break user-space tasks by calling kthread_should_stop() if it's
invalid.
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