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LoongArch has supported PREEMPT_RT now. It uses GENERIC_ENTRY, so just add the TIF bit (TIF_NEED_RESCHED_LAZY) related definitions and select the Kconfig symbol (ARCH_HAS_PREEMPT_LAZY) is enough to make it go. Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>