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

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

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.

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

Ian.

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