linux/mm/page_ext.c

170 	unsigned long pfn = page_to_pfn(page);
184 	index = pfn - round_down(node_start_pfn(page_to_nid(page)),
250 	unsigned long pfn = page_to_pfn(page);
251 	struct mem_section *section = __pfn_to_section(pfn);
263 	return get_entry(page_ext, pfn);
283 static int __meminit init_section_page_ext(unsigned long pfn, int nid)
289 	section = __pfn_to_section(pfn);
298 	 * The value stored in section->page_ext is (base - pfn)
310 	 * The passed "pfn" may not be aligned to SECTION.  For the calculation
313 	pfn &= PAGE_SECTION_MASK;
314 	section->page_ext = (void *)base - page_ext_size * pfn;
337 static void __free_page_ext(unsigned long pfn)
342 	ms = __pfn_to_section(pfn);
355 	base = get_entry(base, pfn);
359 static void __invalidate_page_ext(unsigned long pfn)
364 	ms = __pfn_to_section(pfn);
375 	unsigned long start, end, pfn;
381 	for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION)
382 		fail = init_section_page_ext(pfn, nid);
387 	end = pfn - PAGES_PER_SECTION;
388 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
389 		__free_page_ext(pfn);
397 	unsigned long start, end, pfn;
411 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
412 		__invalidate_page_ext(pfn);
416 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
417 		__free_page_ext(pfn);
450 	unsigned long pfn;
464 		 * scan [start_pfn, the biggest section's pfn < end_pfn) here.
466 		for (pfn = start_pfn; pfn < end_pfn;
467 			pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) {
469 			if (!pfn_valid(pfn))
474 			 * -------------pfn-------------->
477 			if (pfn_to_nid(pfn) != nid)
479 			if (init_section_page_ext(pfn, nid))
501  * @pfn: PFN of the page we're interested in.
503  * Must be called with RCU read lock taken and @pfn must be valid.
507 struct page_ext *page_ext_lookup(unsigned long pfn)
509 	return lookup_page_ext(pfn_to_page(pfn));