Re: [RFC 0/4] CONFIG_STABLE to switch off development checks

Jeremy Fitzhardinge
2007-06-02T16:28:50Z

Dave Kleikamp wrote:
> I'm on Christoph's side here. I don't think it makes sense for any code
> to ask to allocate zero bytes of memory and expect valid memory to be
> returned.
>

Yes, everyone agrees on that. If you do kmalloc(0), its never OK to
dereference the result. The question is whether kmalloc(0) should complain.

> Would a compromise be to return a pointer to some known invalid region?
> This way the kmalloc(0) call would appear successful to the caller, but
> any access to the memory would result in an exception.
>

Yes, that's what Christoph has posted. I'm slightly concerned about
kmalloc() returning the same non-NULL address multiple times, but it
seems sound otherwise.

J