BITS_PER_PAGE_MASK
bit_offset = bm_fo & ~BITS_PER_PAGE_MASK;
PAGE_SIZE*8, bm_fo & BITS_PER_PAGE_MASK);
PAGE_SIZE*8, bm_fo & BITS_PER_PAGE_MASK);
c += (0 == __test_and_set_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr));
c -= (0 != __test_and_clear_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr));
i = test_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr) ? 1 : 0;
tmp = (b->bm_bits & BITS_PER_PAGE_MASK);
tmp = (b->bm_bits & BITS_PER_PAGE_MASK);
last_word = ((b->bm_bits - 1) & BITS_PER_PAGE_MASK) >> LN2_BPL;