linux-kernel - Re: [Xen-devel] [PATCH 1/3] x86: calculate precisely the memory needed by init_memory

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Message-ID: <19963.35531.684825.285975@mariner.uk.xensource.com>
Date:	Fri, 17 Jun 2011 18:11:39 +0100
From:	Ian Jackson <Ian.Jackson@...citrix.com>
To:	<stefano.stabellini@...citrix.com>
CC:	<hpa@...or.com>, <xen-devel@...ts.xensource.com>,
	<konrad.wilk@...cle.com>, <linux-kernel@...r.kernel.org>,
	<mingo@...e.hu>, <hpa@...ux.intel.com>, <yinghai@...nel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] x86: calculate precisely the memory needed
	by init_memory_mapping

stefano.stabellini@...citrix.com writes ("[Xen-devel] [PATCH 1/3] x86: calculate precisely the memory needed by init_memory_mapping"):
> +	if (pgt_buf_end != pgt_buf_top)
> +		printk(KERN_DEBUG "initial kernel pagetable allocation wasted %lx"
> +				" pages\n", pgt_buf_top - pgt_buf_end);

If (due to a bug) pgt_buf_end > pgt_buf_top, this will printk a
message about wasting a negative number of pages, rather than
crashing.  Is there something else that will catch this case ?

Ian.
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