linux-kernel - Re: SLUB: Return ZERO_SIZE

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Message-ID: <84144f020706040937xb06535em543fa887ad65ee8f@mail.gmail.com>
Date:	Mon, 4 Jun 2007 19:37:01 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"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, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> Well, the red-zones won't catch readers, and more importantly, even for
> writers they are *really* inconvenient, because it will just tell you
> something bad happened, it won't tell you *where* it happened.

True.

On 6/4/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> Since comparing the addresses of two zero-sized allocations is insane and
> not done _anyway_, it's just much better to return an invalid address.

Then we might as well return your regular NULL pointer for zero-length
allocations as you can't do anything sane with ZERO_SIZE_PTR either.
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