linux-kernel - sched: Clarify PREEMPT is full preemption model

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Message-Id: <cb013939c11991f429773b83a6ff1513221dd678.a11e9ded.5679.4468.8cc8.fe30e9b90f3f@feishu.cn>
Date: Wed, 15 Jan 2025 17:54:40 +0800
From: 余华兵 <yhb@...jie.com.cn>
To: "mingo@...hat.com" <mingo@...hat.com>, 
	"peterz@...radead.org" <peterz@...radead.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: sched: Clarify PREEMPT is full preemption model

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"
------------------

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