ZRAM_FLAG_SHIFT
return zram->table[index].attr.flags & (BIT(ZRAM_FLAG_SHIFT) - 1);
unsigned long flags = zram->table[index].attr.flags >> ZRAM_FLAG_SHIFT;
zram->table[index].attr.flags = (flags << ZRAM_FLAG_SHIFT) | size;
ZRAM_SAME = ZRAM_FLAG_SHIFT, /* Page consists the same element */