Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits

[Christophe Leroy]

> > > diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h
> > > index 49796b7756af..cd3b8c154d9b 100644
> > > --- a/include/uapi/linux/personality.h
> > > +++ b/include/uapi/linux/personality.h
> > > @@ -22,6 +22,7 @@ enum {
> > >   	WHOLE_SECONDS =		0x2000000,
> > >   	STICKY_TIMEOUTS	=	0x4000000,
> > >   	ADDR_LIMIT_3GB = 	0x8000000,
> > > +	ADDR_LIMIT_47BIT = 	0x10000000,
> > >   };
> >
> > I wonder if ADDR_LIMIT_128T would be clearer?
>
> I don't follow, what does 128T represent?

128T is 128 Terabytes, that's the maximum size achievable with a 47BIT 
address, that naming would be more consistant with the ADDR_LIMIT_3GB 
just above that means a 3 Gigabytes limit.

Christophe