Re: [PATCH 1/2] vmalloc: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR

[Dmitry Antipov]

On 02/28/2012 01:44 PM, Dan Carpenter wrote:
> On Tue, Feb 28, 2012 at 01:33:59PM +0400, Dmitry Antipov wrote:
> >   - Fix vmap() to return ZERO_SIZE_PTR if 0 pages are requested;
> >   - fix __vmalloc_node_range() to return ZERO_SIZE_PTR if 0 bytes
> >     are requested;
> >   - fix __vunmap() to check passed pointer with ZERO_OR_NULL_PTR.
>
> Why?

1) it was requested by the subsystem (co?)maintainer, see http://lkml.org/lkml/2012/1/27/475;
2) this looks to be a convenient way to trace/debug zero-size allocation errors (although
   I don't advocate it as a best way).

Dmitry
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