linux-kernel - Re: [PATCH] Export symbol ksize()

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Message-ID: <alpine.DEB.1.10.0902171115010.29986@qirst.com>
Date:	Tue, 17 Feb 2009 11:17:19 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-crypto@...r.kernel.org, Geert.Uytterhoeven@...ycom.com
Subject: Re: [PATCH] Export symbol ksize()

On Sun, 15 Feb 2009, Matt Mackall wrote:

> And it -is- a category error. The fact that kmalloc is implemented on
> top of kmem_cache_alloc is an implementation detail that callers should
> not assume. They shouldn't call kfree() on kmem_cache_alloc objects
> (even though it might just happen to work), nor should they call
> ksize().

ksize does not take a kmem_cache pointer and it is mainly used for
figuring out how much space kmalloc really allocated for an object. As
such its more part of the kmalloc/kfree set of calls than the
kmem_cache_* calls.

We could add another call

	kmem_cache_size()

for symmetries sake.


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