On Sat, Apr 11, 2020 at 2:48 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > I wasn't entirely forthcoming ... I actually want to introduce a new > > #define page_offset(page, x) ((unsigned long)(x) & (page_size(page) - 1)) No, no, no. THAT would be confusing. Re-using a name (even if you renamed it) for something new and completely different is just bad taste. It would also be a horrible problem - again - for any stable backport etc. Just call that "offset_in_page()" and be done with it. Linus