On Thu, 19 Feb 2015, Jiri Kosina wrote:
> > How about with a TIF_IN_USERSPACE thread flag? It could be cleared/set
> > right at the border. Then for running tasks it's as simple as:
> >
> > if (test_tsk_thread_flag(task, TIF_IN_USERSPACE))
> > klp_switch_task_universe(task);
>
> That's in principle what CONTEXT_TRACKING is doing, i.e. the condition
> we'd be interested in would be
>
> __this_cpu_read(context_tracking.state) == IN_USER
Well, more precisely
per_cpu(context_tracking.state, cpu) == IN_USER
of course.
--
Jiri Kosina
SUSE Labs
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