[Xen-devel] Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes

[Zachary Amsden <zach@xxxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>   
> > I don't like this because now a kernel compiled with both CONFIG_XEN
> > and CONFIG_VMI has "nosegneg" turned on.  We don't actually require
> > this for performance or correctness, so it would be nice to be able to
> > dynamically turn it off instead of having it forced. 
> >     
> Any suggestions about how to do this?  It seems hard to have a note
> dynamically appear and disappear in the vsyscall.so.
>
> I wasn't terribly concerned about this, since there is effectively zero
> performance difference between the two library implementations.
>   
I'm not super concerned either, but I still don't like it.  There 
already is dynamic replacement for vsyscall.so, so you could have just 
dropped in an an-note-ated version.
Zach

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