100 	unsigned long pfn = page_to_pfn(page);  in lookup_page_ext()  local
115 	offset = pfn - round_down(node_start_pfn(page_to_nid(page)),  in lookup_page_ext()
177 	unsigned long pfn = page_to_pfn(page);  in lookup_page_ext()  local
178 	struct mem_section *section = __pfn_to_section(pfn);  in lookup_page_ext()
189 	return section->page_ext + pfn;  in lookup_page_ext()
211 static int __meminit init_section_page_ext(unsigned long pfn, int nid)  in init_section_page_ext()  argument
217 	section = __pfn_to_section(pfn);  in init_section_page_ext()
241 	pfn &= PAGE_SECTION_MASK;  in init_section_page_ext()
242 	section->page_ext = base - pfn;  in init_section_page_ext()
262 static void __free_page_ext(unsigned long pfn)  in __free_page_ext()  argument
267 	ms = __pfn_to_section(pfn);  in __free_page_ext()
270 	base = ms->page_ext + pfn;  in __free_page_ext()
279 	unsigned long start, end, pfn;  in online_page_ext()  local
295 	for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {  in online_page_ext()
296 		if (!pfn_present(pfn))  in online_page_ext()
298 		fail = init_section_page_ext(pfn, nid);  in online_page_ext()
304 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)  in online_page_ext()
305 		__free_page_ext(pfn);  in online_page_ext()
313 	unsigned long start, end, pfn;  in offline_page_ext()  local
318 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)  in offline_page_ext()
319 		__free_page_ext(pfn);  in offline_page_ext()
357 	unsigned long pfn;  in page_ext_init()  local
373 		for (pfn = start_pfn; pfn < end_pfn;  in page_ext_init()
374 			pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {  in page_ext_init()
376 			if (!pfn_valid(pfn))  in page_ext_init()
384 			if (pfn_to_nid(pfn) != nid)  in page_ext_init()
386 			if (init_section_page_ext(pfn, nid))  in page_ext_init()