65 	struct mem_section *section = NULL;  in sparse_index_alloc()  local
70 		section = kzalloc_node(array_size, GFP_KERNEL, nid);  in sparse_index_alloc()
72 		section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,  in sparse_index_alloc()
74 		if (!section)  in sparse_index_alloc()
79 	return section;  in sparse_index_alloc()
85 	struct mem_section *section;  in sparse_index_init()  local
88 	 * An existing section is possible in the sub-section hotplug  in sparse_index_init()
90 	 * the existing section.  in sparse_index_init()
97 	section = sparse_index_alloc(nid);  in sparse_index_init()
98 	if (!section)  in sparse_index_init()
101 	mem_section[root] = section;  in sparse_index_init()
114  * mem_map, we use section_mem_map to store the section's NUMA
123 static inline int sparse_early_nid(struct mem_section *section)  in sparse_early_nid()  argument
125 	return (section->section_mem_map >> SECTION_NID_SHIFT);  in sparse_early_nid()
246 		unsigned long section = pfn_to_section_nr(pfn);  in memory_present()  local
249 		sparse_index_init(section, nid);  in memory_present()
250 		set_section_nid(section, nid);  in memory_present()
252 		ms = __nr_to_section(section);  in memory_present()
256 			__section_mark_present(ms, section);  in memory_present()
341 	 * page being freed and making a section unremovable while  in sparse_early_usemaps_alloc_pgdat_section()
343 	 * a pgdat can prevent a section being removed. If section A  in sparse_early_usemaps_alloc_pgdat_section()
344 	 * contains a pgdat and section B contains the usemap, both  in sparse_early_usemaps_alloc_pgdat_section()
346 	 * from the same section as the pgdat where possible to avoid  in sparse_early_usemaps_alloc_pgdat_section()
390 		pr_info("node %d must be removed before remove section %ld\n",  in check_usemap_section_nr()
396 	 * Some platforms allow un-removable section because they will just  in check_usemap_section_nr()
398 	 * Just notify un-removable section's number here.  in check_usemap_section_nr()
400 …pr_info("Section %ld and %ld (node %d) have a circular dependency on usemap and pgdat allocations\…  in check_usemap_section_nr()
463 	 * and we want it to be properly aligned to the section size - this is  in sparse_buffer_init()
556  * for each and record the physical to section mapping.
666 				"section already deactivated (%#lx + %ld)\n",  in clear_subsection_map()
733 		 * When this function is called, the removing section is  in free_map_bootmem()
735 		 * from page allocator. If removing section's memmap is placed  in free_map_bootmem()
736 		 * on the same section, it must not be freed.  in free_map_bootmem()
765  * 1. deactivation of a partial hot-added section (only possible in
767  *      a) section was present at memory init.
768  *      b) section was hot-added post memory init.
769  * 2. deactivation of a complete hot-added section.
770  * 3. deactivation of a complete section from memory init.
793 		 * When removing an early section, the usage map is kept (as the  in section_deactivate()
795 		 * will be re-used when re-adding the section - which is then no  in section_deactivate()
796 		 * longer an early section. If the usage map is PageReserved, it  in section_deactivate()
805 		 * Mark the section invalid so that valid_section()  in section_deactivate()
851 	 * referenced.  If we hot-add memory into such a section then we  in section_activate()
868  * sparse_add_section - add a memory section, or populate an existing one
869  * @nid: The node to add section on
871  * @nr_pages: number of pfns to add in the section
876  * Note that only VMEMMAP supports sub-section aligned hotplug,
882  * * -EEXIST	- Section has been present.
911 	/* Align memmap to section boundary in the subsection case */  in sparse_add_section()
925 	 * A further optimization is to have per section refcounted  in clear_hwpoisoned_pages()