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RE: [Xen-ia64-devel] [PATCH] Cleanup hypercall.h

To: "Williamson, Alex (Linux Kernel Dev)" <alex.williamson@xxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: RE: [Xen-ia64-devel] [PATCH] Cleanup hypercall.h
From: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Date: Tue, 28 Feb 2006 09:34:11 -0800
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Thread-topic: [Xen-ia64-devel] [PATCH] Cleanup hypercall.h
> > Seems it's similar issue as previous one (cpu_online_map). For x86,
> >  CONFIG_SMP is the base and always on, so it's very likely for 
> > common code to access variables defined only under CONFIG_SMP. 
> > Should we enable CONFIG_SMP by default, once it gets more stable?
> > 
> > Tristan, how about your opinion? Is it time for changing that now?
> 
>    You're right, with CONFIG_SMP, it looks like xen-unstable 
> will build.
> Given the statement from Keir that UP isn't supported on xen/i386, I'm
> in favor of making SMP the default config for xen/ia64.  Ultimately we
> need to go there anyway, and with all the recent patches, SMP 
> is pretty
> well function.  Thanks,

If there's any question of stability, perhaps we can turn
on CONFIG_SMP at compile-time but turn it off (at least for
now) at run-time (e.g. implement "nosmp" but turn it on by
default for now).

Dan

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