[ Sorry, AFK there for a while ] On Tue, Sep 20, 2016 at 2:03 PM, Al Viro <v...@zeniv.linux.org.uk> wrote: > > What proper mappings? If you manage to mmap something at (void*)-PAGE_SIZE, > you are very deep in trouble regardless. We use IS_ERR() on userland > pointers and any architecture where that would be possible would be confused > as hell.
Ack, you've convinced me. Will apply the patch. Linus