Messages in this thread | | | Date | Tue, 28 Feb 2012 15:59:25 +0400 | From | Dmitry Antipov <> | Subject | Re: [PATCH 1/2] vmalloc: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR |
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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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