On 2024/7/30 23:12, Alexander H Duyck wrote:

...

quoted

        }

        nc->pagecnt_bias--;
        nc->remaining = remaining - fragsz;

        return encoded_page_address(encoded_va) +
                (page_frag_cache_page_size(encoded_va) - remaining);

Parenthesis here shouldn't be needed, addition and subtractions
operations can happen in any order with the result coming out the same.

I am playing safe to avoid overflow here, as I am not sure if the allocator
will give us the last page. For example, '0xfffffffffffff000 + 0x1000' will
have a overflow.