Ia64 kdump patch

[nanhai.zou at intel.com (Zou, Nanhai)]

> -----Original Message-----
> From: Jay Lan [mailto:jlan at sgi.com]
> Sent: 2006Äê8ÔÂ4ÈÕ 9:47
> To: Zou, Nanhai
> Cc: Jay Lan; fastboot at lists.osdl.org; Horms; Linux-IA64; khalid_aziz at hp.com
> Subject: Re: Ia64 kdump patch
> 
> Zou Nan hai wrote:
> > On Fri, 2006-07-28 at 05:41, Jay Lan wrote:
> >
> >>Hi,
> >>
> >>I applied the patch to 2.6.18-rc2. However, compilation failed
> >>at machine_shutdown() of arch/ia64/kernel/machine_kexec.c on
> >>an sn2 machine.
> >>
> >>It was easy to figure out irq_descp() is gone and idesc->handle
> >>is replaced with idesc->chip. But this code in machine_shutdown()
> >>caused an error:
> >>
> >>...
> >>if (cpu != smp_processor_id())
> >>cpu_down(cpu);
> >>}
> >>}
> >>#elif defined(CONFIG_SMP)
> >>smp_call_function(kexec_stop_this_cpu, (void *)image->start, 0, 0); <===
> >>#endif
> >>
> >>'image' is undefined in the code. Was it a global? Where was it
> >>declared?
> >>
> >>Thanks,
> >>- jay
> >>
> >
> >   Hi, can you try if it works with CONFIG_HOTPLUG_CPU enabled?
> >   Thanks
> >   Zou Nan hai
> 
> Sorry i have been pulled away on something else...
> With CONFIG_HOTPLUG_CPU enabled, the problem code would not get
> compiled, thus i was able to create a kernel rpm. Unfortunately
> i failed to boot the sn2 kernel...
> 
> So i switched to my reference box, an ia64 HP zx box. It booted
> up OK (tiger defconfig). Then i got stuck on a stupid quesiton:
> I was not able to run the 'kexec' command to load the kernel
> specified in the '-p' parameter. What kernel was i supposed
> to specify there? The one i built? Or, a reqular kernel that
> proves to work?
> 
> Thanks,
>   - jay
 Forget to mention,
 If you are using same kernel as first and crash kernel, you'd better pass an additional 
 "maxcpus=1" kernel parameter to the second kernel.

Thanks
Zou Nan hai