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SubjectRe: [PATCH] kexec for ia64
On Mon, 2006-03-13 at 22:44 -0800, Andrew Morton wrote:
> Khalid Aziz <> wrote:
> > + int cpu;
> > +
> > + for_each_online_cpu(cpu) {
> > + if (cpu != smp_processor_id())
> > + cpu_down(cpu);
> > + }
> > +#else
> > + smp_call_function(kexec_stop_this_cpu, (void *)image->start, 0, 0);
> > +#endif
> > +#endif
> Why is different code needed for hotplug cpu?

Hi Andrew,

It is preferable to use cpu_down() to shoot down a cpu, but this
function is available only with CONFIG_HOTPLUG_CPU. If
CONFIG_HOTPLUG_CPU is not enabled, only other way to shut down slave
CPUs in a state where they would come back up when the new kernel boots
up and sends them IPI is to hold them in a fake rendezvous which is what
the function kexec_stop_this_cpu() does. So the choices are either to
keep both ways of shutting down CPUs or go with kexec_stop_this_cpu()
for all cases.

Thanks for the comments. I will move declarations to header files as you


Khalid Aziz Open Source and Linux Organization
(970)898-9214 Hewlett-Packard Fort Collins, CO

"The Linux kernel is subject to relentless development"
- Alessandro Rubini

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