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CONFIG_DEBUG_PREEMPT: Debug preemptible kernel

General informations

The Linux kernel configuration item CONFIG_DEBUG_PREEMPT:

• prompt: Debug preemptible kernel
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && CONFIG_PREEMPT && CONFIG_TRACE_IRQFLAGS_SUPPORT
• defined in lib/Kconfig.debug
• found in Linux kernels: 2.6.11–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

If you say Y here then the kernel will use a debug variant of the commonly used smp_processor_id() function and will print warnings if kernel code uses it in a preemption-unsafe way. Also, the kernel will detect preemption count underflows.

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