preempt_schedule_context — preempt_schedule called by tracing
__visible void __sched notrace preempt_schedule_context ( | void); |
The tracing infrastructure uses preempt_enable_notrace to prevent
recursion and tracing preempt enabling caused by the tracing
infrastructure itself. But as tracing can happen in areas coming
from userspace or just about to enter userspace, a preempt enable
can occur before user_exit is called. This will cause the scheduler
to be called when the system is still in usermode.
To prevent this, the preempt_enable_notrace will use this function
instead of preempt_schedule to exit user context if needed before
calling the scheduler.