hi,

> > We are clearly talking at cross-purposes, but I still don't see where
> > or why.  Perhaps you could explain once more what the intended purpose
> > of your patch is?
> 
> my purposes are:
> - being more mp-safe.
> - preparing to implement lazy mapping of loaned pages, which can need to
>   change a state (mapped/unmapped) of shared mbuf.

have you been convinced?  or just too busy?

YAMAMOTO Takashi