linux-kernel - Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console

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Message-ID: <45FACD9F.6020604@goop.org>
Date:	Fri, 16 Mar 2007 10:02:23 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure
 for Xen console

Ingo Molnar wrote:
>> +	prod = intf->in_prod;
>> +	mb();
>> +	BUG_ON((prod - cons) > sizeof(intf->in));
>>     
>
> such mb()'s are typically a sign of "i have no clear idea what SMP 
> serialization rules apply here, but something is needed because 
> otherwise it breaks" ?

Hm, in this case its because it's sharing the memory with Xen, so
there's a particular ordering protocol.  It needs some comments.

    J

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