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Re: [Xen-devel] [PATCH 05/12] tools/migration: Drop IHDR_VERSION constant from libxc and python


  • To: Ian Jackson <ian.jackson@xxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 15 Jan 2020 15:29:41 +0000
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  • Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
  • Delivery-date: Wed, 15 Jan 2020 15:29:55 +0000
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On 14/01/2020 16:05, Ian Jackson wrote:
> Andrew Cooper writes ("[PATCH 05/12] tools/migration: Drop IHDR_VERSION 
> constant from libxc and python"):
>> Migration v3 is in the process of being introduced, meaning that the code has
>> to cope with both versions.  Use an explicit 2 for now.
>>
>> For the verify-stream-v2 and convert-legacy-stream scripts, update text to 
>> say
>> "v2 (or later)".  What matters is the distinction vs legacy streams.
> How about introducing
>   enum { IHDR_VERSION_2 = 2 }
> or some such ?
>
> In C it can be hard otherwise to find all the relevant tests.  Being
> able to grep for IHDR_VERSION would help.  So I would prefer manifest
> constants of some kind to unvarnished integers.

There is exactly (and only ever) one place where this constant is
checked.  This is a consequence of it being read out of a pipe.

It is highly unlikely that the code will gain a second check.

~Andrew

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