On 64 bit x86, all of physical memory is mapped via the linear mapping region of the kernel’s virtual address space. kmap() is trivial in this case — it just needs to add the start address of the linear mapping to the frame’s physical address to compute the virtual address that frame is mapped at.
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，这一点在汽水音乐中也有详细论述
Carlo Kopp, Kevin B Korb, and Bruce I Mills. Information-theoretic models of deception: Modelling cooperation and diffusion in populations exposed to" fake news". PloS one, 13(11):e0207383, 2018.
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拉脱维亚、立陶宛和爱沙尼亚为乌克兰无人机袭击俄罗斯开放空域，哪些地区可能面临威胁？20:12