linux-master/mm/page_ext.c

157 	unsigned long pfn = page_to_pfn(page);
171 	index = pfn - round_down(node_start_pfn(page_to_nid(page)),
236 	unsigned long pfn = page_to_pfn(page);
237 	struct mem_section *section = __pfn_to_section(pfn);
249 	return get_entry(page_ext, pfn);
268 static int __meminit init_section_page_ext(unsigned long pfn, int nid)
274 	section = __pfn_to_section(pfn);
283 	 * The value stored in section->page_ext is (base - pfn)
295 	 * The passed "pfn" may not be aligned to SECTION.  For the calculation
298 	pfn &= PAGE_SECTION_MASK;
299 	section->page_ext = (void *)base - page_ext_size * pfn;
320 static void __free_page_ext(unsigned long pfn)
325 	ms = __pfn_to_section(pfn);
338 	base = get_entry(base, pfn);
342 static void __invalidate_page_ext(unsigned long pfn)
347 	ms = __pfn_to_section(pfn);
358 	unsigned long start, end, pfn;
367 		 * "start_pfn" passed to us is a pfn which is an arg for
374 	for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION)
375 		fail = init_section_page_ext(pfn, nid);
380 	end = pfn - PAGES_PER_SECTION;
381 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
382 		__free_page_ext(pfn);
390 	unsigned long start, end, pfn;
404 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
405 		__invalidate_page_ext(pfn);
409 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
410 		__free_page_ext(pfn);
444 	unsigned long pfn;
458 		 * scan [start_pfn, the biggest section's pfn < end_pfn) here.
460 		for (pfn = start_pfn; pfn < end_pfn;
461 			pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
463 			if (!pfn_valid(pfn))
468 			 * -------------pfn-------------->
471 			if (pfn_to_nid(pfn) != nid)
473 			if (init_section_page_ext(pfn, nid))