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ВсеПолитикаОбществоПроисшествияКонфликтыПреступность，详情可参考新收录的资料
。关于这个话题，新收录的资料提供了深入分析
Calls kmap() to map that frame into the kernel’s virtual address space as writable.。新收录的资料是该领域的重要参考
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.