From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH 08 of 15] hvmloader: Add a simple "scratch
	allocator"
Date: Thu, 2 Jun 2011 15:43:31 -0400
Message-ID: <20110602194331.GA32344@dumpdata.com>
References: <patchbomb.1306921195@cosworth.uk.xensource.com>
	<3c920f4ec4f24e1c1347.1306921203@cosworth.uk.xensource.com>
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> +void *scratch_alloc(uint32_t size, uint32_t align)
> +{
> +    uint32_t s, e;
> +
> +    /* Align to at least one kilobyte. */
> +    if ( align < 1024 )
> +        align = 1024;
> +
> +    s = (scratch_start + align - 1) & ~(align - 1);
> +    e = s + size - 1;
> +
> +    BUG_ON(e < s);
> +
> +    scratch_start = e;
> +
> +    return (void *)(unsigned long)s;

Why the double cast?