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The Linux kernel configuration item CONFIG_HAVE_CONTEXT_TRACKING_USER:

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Provide kernel/user boundaries probes necessary for subsystems that need it, such as userspace RCU extended quiescent state. Syscalls need to be wrapped inside user_exit()-user_enter(), either optimized behind static key or through the slow path using TIF_NOHZ flag. Exceptions handlers must be wrapped as well. Irqs are already protected inside ct_irq_enter/ct_irq_exit() but preemption or signal handling on irq exit still need to be protected.



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