Justus Winter, le Thu 15 May 2014 12:32:41 +0200, a écrit : > Quoting Samuel Thibault (2014-05-15 02:13:13) > > Justus Winter, le Fri 02 May 2014 21:33:01 +0200, a écrit : > > > io_map_cached is like io_map, but reuses the old mapping if it is > > > applicable. > > > > But AIUI, if it is not applicable, it does not unmap the previous > > mapping, so we lose virtual memory. > > > > A really transparent io_map_cached seems not really feasible, since you > > never know what the caller will do with the pointer. > > Right, I did this b/c I didn't know how to do this properly.
> accessing this physical address with phystokv() fails b/c it is > outside the mapped range Ok. I'd say then to just use io_map once for accessing that (AIUI one knows the needed size), and then free the mapped memory region after that with kmem_free. Samuel
