On Tue, 3 Oct 2017, Richard Weinberger wrote: > On Mon, Oct 2, 2017 at 12:29 AM, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> wrote: > > On Sun, 1 Oct 2017, Christoph Hellwig wrote: > > > >> up_read(&mm->mmap_sem) in the fault path is a still a complete > >> no-go, > >> > >> NAK > > > > Care to elaborate? > > > > What about mm/filemap.c:__lock_page_or_retry() then? > > As soon you up_read() in the page fault path other tasks will race > with you before > you're able to grab the write lock. But I _know_ that. Could you highlight an area in my code where this is not accounted for? Nicolas
