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Without any patch, the kernel support something, like following.
The configuration item CONFIG_TREE_PREEMPT_RCU:
* prompt: Preemptable tree-based hierarchical RCU
* type: tristate
* depends on: CONFIG_PREEMPT
* defined in init/Kconfig
* found in Linux Kernels: from 2.6.32 release still available on 2.6.38 release
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Is PREEMPT_RT already implemented?
