Re: [PATCH 1/3] slab: introduce krealloc

[Christoph Lameter <clameter@sgi.com>]

On Wed, 21 Feb 2007, Pekka J Enberg wrote:

> +void *krealloc(const void *p, size_t new_size, gfp_t flags)
> +{
> +	void *ret;
> +
> +	if (unlikely(!p))
> +		return kmalloc_track_caller(new_size, flags);
> +
> +	if (unlikely(!new_size)) {
> +		kfree(p);
> +		return NULL;
> +	}
> +
> +	ret = kmalloc_track_caller(new_size, flags);
> +	if (!ret)
> +		return NULL;
> +
> +	memcpy(ret, p, min(new_size, ksize(p)));
> +	kfree(p);
> +	return ret;
> +}
> +EXPORT_SYMBOL(krealloc);

Well could you check ksize for the old object first and if ksize <= new 
size then just skip the copy? I think this may allow you 
to get rid of the ksize callers.