CONFIG_RCU_CPU_STALL_NOTIFIER: Provide RCU CPU-stall notifiers

General informations

The Linux kernel configuration item CONFIG_RCU_CPU_STALL_NOTIFIER:

• prompt: Provide RCU CPU-stall notifiers
• type: bool
• depends on: ( CONFIG_RCU_STALL_COMMON ) && ( CONFIG_DEBUG_KERNEL ) && ( CONFIG_RCU_EXPERT )
• defined in kernel/rcu/Kconfig.debug
• found in Linux kernels: 6.8–6.12, 6.13-rc+HEAD

Help text

WARNING: You almost certainly do not want this!!!

Enable RCU CPU-stall notifiers, which are invoked just before printing the RCU CPU stall warning. As such, bugs in notifier callbacks can prevent stall warnings from being printed. And the whole reason that a stall warning is being printed is that something is hung up somewhere. Therefore, the notifier callbacks must be written extremely carefully, preferably containing only lockless code. After all, it is quite possible that the whole reason that the RCU CPU stall is happening in the first place is that someone forgot to release whatever lock that you are thinking of acquiring. In which case, having your notifier callback acquire that lock will hang, preventing the RCU CPU stall warning from appearing.

Say Y here if you want RCU CPU stall notifiers (you don't want them) Say N if you are unsure.

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