Re: [Xen-devel] [PATCH] libxl: add option for discard support to xl disk configuration

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-01-30 at 11:32 +0000, Ian Jackson wrote:
> Ian Campbell writes ("Re: [PATCH] libxl: add option for discard support to xl 
> disk configuration"):
> > There is no need to make the actual field conditional -- that would
> > actually be wrong since it would modify the ABI depending on what the
> > application asked for, meaning it would differ from how libxl was
> > actually built. An application which us using an ABI before 4.5 simply
> > won't think to touch this field.
> 
> You mean an application which is using an API (P not B) before 4.5.

Yes, sorry.

> I.e. the API is forward-compatible but the ABI is compatible only
> within a Xen release.

Correct.

Ian.


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