linux-master/mm/page_alloc.c

377 	unsigned long bitidx, word_bitidx;
381 	bitidx = pfn_to_bitidx(page, pfn);
382 	word_bitidx = bitidx / BITS_PER_LONG;
383 	bitidx &= (BITS_PER_LONG-1);
390 	return (word >> bitidx) & mask;
411 	unsigned long bitidx, word_bitidx;
418 	bitidx = pfn_to_bitidx(page, pfn);
419 	word_bitidx = bitidx / BITS_PER_LONG;
420 	bitidx &= (BITS_PER_LONG-1);
424 	mask <<= bitidx;
425 	flags <<= bitidx;