linux-kernel - Re: SLUB: Return ZERO_SIZE

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Message-ID: <84144f020706041002t39142548l29cff861461dd7d7@mail.gmail.com>
Date:	Mon, 4 Jun 2007 20:02:09 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Roland Dreier" <rdreier@...co.com>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Christoph Lameter" <clameter@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, jeremy@...p.org
Subject: Re: SLUB: Return ZERO_SIZE_PTR for kmalloc(0)

On 6/4/07, Roland Dreier <rdreier@...co.com> wrote:
> No, because as was mentioned earlier in the thread, we want code to be
> able to handle 0-sized allocations without special cases.  The goal is
> that code like
>
>         buf = kmalloc(nobj * obj_size);
>         if (buf == NULL)
>                 return -ENOMEM;
>
> should work fine if nobj happens to be 0.  But we do want to get an
> oops if the code actually tries to read or write *buf.

Aah, missed that part of the discussion. Sorry for the noise ;-)
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