On Mon, 11 Feb 2019, John Hubbard wrote: > But anyway, Jan's proposal a bit earlier today [1] is finally sinking into > my head--if we actually go that way, and prevent the caller from setting up > a problematic gup pin in the first place, then that may make this point sort > of moot. Ok well can be document how we think it would work somewhere? Long term mapping a page cache page could a problem and we need to explain that somewhere. > > ie indicate to the FS that is should not attempt to remap physical > > memory addresses backing this VMA. If the FS can't do that it must > > fail. > > > > Yes. Duration is probably less important than the fact that the page > is specially treated. Yup.
