>This doesn't need to be fixed on x86 -- the int3 handler will return
>silently if the debugger is not configured. It would be nice if the ia64
>handler would do the same. If that is not possible then change only ia64
>code and if you need to be able to probe gdbstub configuration then add a
>public function to do that rather than grope at internal state. The same
>goes for powerpc, *if* it is broken in the first place.
I know the int3 hanlder return well on x86 if it is not configured.
But the route may be not safe. The debugger_trap is called after hypervisor
panic and dom0 panic. So I want to avoid the needless route for kexec/kdump.
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