linux-kernel - Re: [PATCH 1/2] vmalloc: use ZERO_SIZE_PTR / ZERO_OR_NULL

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Message-ID: <4F4CC19D.9040608@linaro.org>
Date:	Tue, 28 Feb 2012 15:59:25 +0400
From:	Dmitry Antipov <dmitry.antipov@...aro.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Rusty Russell <rusty.russell@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [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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