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The Linux kernel configuration item CONFIG_HAVE_CONTEXT_TRACKING_USER_OFFSTACK:

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Architecture neither relies on exception_enter()/exception_exit() nor on schedule_user(). Also preempt_schedule_notrace() and preempt_schedule_irq() can't be called in a preemptible section while context tracking is CONTEXT_USER. This feature reflects a sane entry implementation where the following requirements are met on critical entry code, ie: before user_exit() or after user_enter():

- Critical entry code isn't preemptible (or better yet: not interruptible). - No use of RCU read side critical sections, unless ct_nmi_enter() got called. - No use of instrumentation, unless instrumentation_begin() got called.



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