* Re: ia64-cpu-hotplug-cpu_present.patch?
[not found] <20040427225741.2fe78d88.pj@sgi.com>
@ 2004-04-28 14:52 ` Ashok Raj
2004-04-28 16:05 ` ia64-cpu-hotplug-cpu_present.patch? Paul Jackson
0 siblings, 1 reply; 2+ messages in thread
From: Ashok Raj @ 2004-04-28 14:52 UTC (permalink / raw)
To: Paul Jackson; +Cc: akpm, ashok.raj, linux-kernel, linux-ia64
On Tue, Apr 27, 2004 at 10:57:41PM -0700, Paul Jackson wrote:
Hi Paul,
sorry for the trouble. I will try to address them, and will try to resolve the compile problem
you are having.
> I cannot find any mention of it on lkml or any other email list that
> either Google or I track.
>
> Is there some backdoor path to Andrew's patch directory I don't know of ;)?
I sent the patch to linux-ia64, but forgot to copy lkml. No... i did not buy crispy
cream for andrew.. although that did cross my mine :-)
Some of the points you raise, i will look into, but here is a quick summary fo Paul's top 10
list!.
cpu_present is required so that when cpu_up is called in smp_init() we dont call for all
possible cpu's but just for cpu's physically present.
cpu_possible - indicates cpu may be available, but may not be present in the system. Hence
different from phys_cpu_present_mask
cpu_possible wont change dynamically but present_map can change depending on the arrival of
cpu's in a system. I implemented it for only ia64, and expection is that ACPI or its equilvalent
would populate cpu_present_map dynamically.
In architectures that dont have cpu_hotplug capability, i have kept cpu_present and possible the same.
Once i take a look at the failures, i will send you an updated patch. again really sorry for the
inconvenience.
Cheers,
ashok
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