Sun, Y. et al..
On one hand, I suppose it's another praise towards Guix's flexibility to be able to "patch" the package lookup with an arbitrary older (or even completely separate) channel. Doing so on a traditional, imperative package manager would be a giant pain.
，详情可参考有道翻译
The last step is executing the writes. This is achieved through copy_to_user_page(), which is essentially a memcpy. Since the destination is the writable mapping from kmap(), this just works.
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