From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH v4 --for 4.6 COLOPre 13/25] migration/save:
 pass checkpointed_stream from libxl to libxc
Date: Thu, 16 Jul 2015 17:10:40 +0100
Message-ID: <20150716161040.GZ12455@zion.uk.xensource.com>
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To: Yang Hongyang <yanghy@cn.fujitsu.com>
Cc: wei.liu2@citrix.com, Ian Campbell <Ian.Campbell@citrix.com>, wency@cn.fujitsu.com, andrew.cooper3@citrix.com, yunhong.jiang@intel.com, eddie.dong@intel.com, xen-devel@lists.xen.org, guijianfeng@cn.fujitsu.com, rshriram@cs.ubc.ca, Ian Jackson <Ian.Jackson@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, Jul 15, 2015 at 03:45:39PM +0800, Yang Hongyang wrote:
> Pass checkpointed_stream from libxl to libxc.
> It won't affact legacy migration because legacy migration
> won't use this param.
> 
> Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Andrew Cooper <andrew.cooper3@citrix.com>
> ---
[...]
>  
> +    if (dss->checkpointed_stream && !r_info) {

Please explicitly check for _NONE type instead of relying it of being 0.
Arguably the actual value is not going to change in the future but it's
better to be explicit.

Wei.

> +        LOG(ERROR, "Migration stream is checkpointed, but there's no "
> +                   "checkpoint info!");
> +        goto out;
> +    }
> +
>      dss->rc = 0;
>      logdirty_init(&dss->logdirty);
>      dsps->ao = ao;