On Fri, Jan 13, 2017 at 06:19:28AM -0700, Jan Beulich wrote: > >>> On 13.01.17 at 13:49, <daniel.ki...@oracle.com> wrote: > > On Fri, Jan 13, 2017 at 05:35:35AM -0700, Jan Beulich wrote: > >> >>> On 13.01.17 at 13:14, <daniel.ki...@oracle.com> wrote: > >> > Jan, so, __XEN_LATEST_INTERFACE_VERSION__ is used only for Xen internal > >> > purposes > >> > (eg. for xl build, etc.) and should not be used as a reference point > >> > externally, > >> > e.g. in kexec-tools? > >> > >> It's certainly meant for external consumption (see my original reply > >> to Eric), but if at all possible you should not use it for (build time, > >> obviously) feature detection. > > > > So, AIUI, __XEN_LATEST_INTERFACE_VERSION__ should be used when e.g. > > structure > > layout passed to a given hypercall changes and it is not possible to detect > > such change in other way. Right? > > No, structure _layout_ must not change (other than in tools only > interfaces). But structure field naming occasionally changes. While > that retains binary compatibility, source code requires changes in > such a case, and that's what the symbol is meant to help with.
Thanks, make sense. Daniel _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
