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Boot memory allocator

Hi, all
Boot memory allocator is used to allocate core kernel structures before start_kernel() is invoked,  and  boot  memory allocator is associated  with  struct  bootmem_data  existing for each node  of memory in the system.  My question is who will allocate the struct bootmem_data for boot memory allocator? and who will allocate the struct pg_data_t for each node?

Thanks!
Best regards,
Wang Yu

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National Research Center for Intelligent Computing Systems
Institute of Computing Technology, Chinese Academy of Sciences