Hi,
When I'm trace uml kernel with gdb, I found there are two mem_map
(struct page) arrays.
1) the first one created in init_maps function, and pointed by *local*
pointer struct page *map in init_maps function
arch/um/kernel/um_arch.c
264 int __init linux_main(int argc, char **argv)
.....
350 setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
351 if (init_maps(physmem_size, iomem_size, highmem)) {
352 printf("Failed to allocate mem_map for %Lu bytes
of physical "
353 "memory and %Lu bytes of highmem\n", physmem_size,
354 highmem);
355 exit(1);
356 }
2) the second mem_map created in
start_kernel -> setup_arch -> paging_init -> free_area_init ->
free_area_init_core -> alloc_node_mem_map
and it has been pointer by global pointer "contig_page_data->node_mem_map"
Why need struct page array (the first one) for boot memory allocate? I
tried to deleted the 351~356 lines in linux_main function and the
built/run the uml kernel. The new kernel can boot and run. But it may
panic.
Thanks
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