代码拉取完成，页面将自动刷新
1、增加了一个 preempt=none/voluntary/full 启动选项，允许动态切换内核抢占模式，主要是为了编译成抢占模式的发行版，能通过启动参数关抢占
2、增加debug/sched_preempt开关，可以动态修改抢占模式
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openEuler-21.09分支合入如下相关补丁：
bdba1361823f sched: Add /debug/sched_preempt
6763188a597a preempt/dynamic: Support dynamic preempt with preempt= boot option
56ef75d8fb91 preempt/dynamic: Provide irqentry_exit_cond_resched() static call
94c196f8de6d preempt/dynamic: Provide preempt_schedule_notrace static calls
49bdb0a971be preempt/dynamic: Provide cond_resched() and might_resched() static calls
ba5c1e2e8ad9 preempt: Introduce CONFIG_PREEMPT_DYNAMIC
63261f119e94 static_call: Provide DEFINE_STATIC_CALL_RET0()
fafb88c677da static_call/x86: Add __static_call_return0()
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