Re: Intel P6 vs P7 system call performance

[Matti Aarnio]

On Tue, Dec 17, 2002 at 09:07:21AM -0800, Linus Torvalds wrote:
> On Tue, 17 Dec 2002, Hugh Dickins wrote:
> > I thought that last page was intentionally left invalid?
> 
> It was. But I thought it made sense to use, as it's the only really
> "special" page.

  In couple of occasions I have caught myself from pre-decrementing
  a char pointer which "just happened" to be NULL.

  Please keep the last page, as well as a few of the first pages as
  NULL-pointer poisons.

> But yes, we should decide on this quickly - it's easy to change right now,
> but..
> 
> 		Linus

/Matti Aarnio