[Xen-ia64-devel] Re: xen-unstable broken due to CONFIG_SMP problem

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 Jan 2006, at 20:48, Magenheimer, Dan (HP Labs Fort Collins) wrote:

> Since this patch is really a hack, I thought I would
> solicit better patches first.  In particular, there
> are several hacks to compile !CONFIG_SMP on Xen/ia64...
> see config.h and note that most of smpboot.c is #ifdef
> CONFIG_SMP (but probably need not be).  Or, since
> Xen/x86 always is compiled with CONFIG_SMP, it might
> be best to fix CONFIG_SMP (flush_tlb_mask(), possibly
> other fixes) and also always compile Xen/ia64 with
> CONFIG_SMP.
>
> Any comments?  Any volunteers?
In this case the best and simplest fix will simply be to define 
cpu_online_map as:
cpumask_t cpu_online_map = CPU_MASK_CPU0.

Or, if you want to share the definition with SMP builds  then declare 
cpu_online_map unconditionally with no initialiser and then sometime 
during boot make sure you do cpu_online_map = 
cpumask_of_cpu(boot_cpu_id);
 -- Keir


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