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The Linux kernel configuration item CONFIG_HAVE_RCU_USER_QS:

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Provide kernel entry/exit hooks necessary for userspace RCU extended quiescent state. Syscalls need to be wrapped inside rcu_user_exit()-rcu_user_enter() through the slow path using TIF_NOHZ flag. Exceptions handlers must be wrapped as well. Irqs are already protected inside rcu_irq_enter/rcu_irq_exit() but preemption or signal handling on irq exit still need to be protected.



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