> > > I mean
> 
> there is the code to handle the first gap specially only for
> non-topdown case but

where?  in the patch i posted?
it isn't my intention.  maybe a bug.

> > > we don't need to search space in the gap between map start and
> > > first entry in topdown (non-fixed mapping) case.
> 
> so, it would be ok.

yes, but it's better not to have such assumptions about
upper layer behaviors, IMO.

> btw, is the change in uvmspace_exec() really necessary?

no.  thanks for pointing.

YAMAMOTO Takashi