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