lkml.org 
[lkml]   [2006]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] kexec for ia64
From
Date
On Mon, 2006-03-13 at 22:44 -0800, Andrew Morton wrote:
> Khalid Aziz <khalid_aziz@hp.com> 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
suggested.

--
Khalid

====================================================================
Khalid Aziz Open Source and Linux Organization
(970)898-9214 Hewlett-Packard
khalid.aziz@hp.com Fort Collins, CO
"The Linux kernel is subject to relentless development"
- Alessandro Rubini

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-03-14 17:02    [from the cache]
©2003-2011 Jasper Spaans