sched: Clarify PREEMPT is full preemption model

[余华兵]

The configuration file "kernel/Kconfig. preempt" says that PREEMPT_RT is  fully preemptible, but from the function preempt_model_full() it can be  seen that PREEMPT is full preemption model. -------------------------- kernel/Kconfig.preempt config PREEMPT         bool "Preemptible Kernel (Low-Latency Desktop)" config PREEMPT_RT         bool "Fully Preemptible Kernel (Real-Time)" include/linux/preempt.h static inline bool preempt_model_full(void) {         return IS_ENABLED(CONFIG_PREEMPT); } -------------------------- I suggest that the configuration file "kernel/Kconfig. preempt" should be  consistent with the function preempt_model_full(). Modify the file  "kernel/Kconfig.preempt" as follows. ------------------ config PREEMPT         bool "Fully Preemptible Kernel (Low-Latency Desktop)" config PREEMPT_RT         bool "Real-time Kernel" ------------------

Attachment: Clarify-PREEMPT-is-full-preemption-model.patch
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