CONFIG_PREEMPT_RT_NEEDS_BH_LOCK: Enforce softirq synchronisation on PREEMPT_RT

General informations

The Linux kernel configuration item CONFIG_PREEMPT_RT_NEEDS_BH_LOCK:

• prompt: Enforce softirq synchronisation on PREEMPT_RT
• type: bool
• depends on: CONFIG_PREEMPT_RT
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 6.18-rc+HEAD

Help text

Enforce synchronisation across the softirqs context. On PREEMPT_RT the softirq is preemptible. This enforces the same per-CPU BLK semantic non-PREEMPT_RT builds have. This should not be needed because per-CPU locks were added to avoid the per-CPU BKL.

This switch provides the old behaviour for testing reasons. Select this if you suspect an error with preemptible softirq and want test the old synchronized behaviour.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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