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Re: [Qemu-ppc] [PATCH 5/5] spapr: drop DIV_ROUND_UP() from xics_max_serv

From: Greg Kurz
Subject: Re: [Qemu-ppc] [PATCH 5/5] spapr: drop DIV_ROUND_UP() from xics_max_server_number()
Date: Thu, 15 Feb 2018 17:08:57 +0100

On Thu, 15 Feb 2018 15:08:18 +1100
David Gibson <address@hidden> wrote:

> On Wed, Feb 14, 2018 at 08:41:03PM +0100, Greg Kurz wrote:


> > 
> > It breaks migration of pre-2.7 machine types with unusual CPU topologies,
> > but I guess this is an acceptable trade-off.  
> No, not really.  Weird topologies are still allowed on old machine
> types for backwards compatibility, and we shouldn't break that.  I
> like the idea of consolidating this calculation, but we can't do it by
> just breaking the older machines (at least not until they're formally
> deprecated).

Heh, I had put this patch at the end because I was expecting you might
nack it :)

Per curiosity, when/how do we decide that an older machine type may be formally
deprecated ?

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