linux-kernel - Re: [PATCH -v2 5/5] x86: use dmi check to treat disabled cpus as hotplug cpus.

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Date:	Tue, 12 Jan 2010 18:06:03 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v2 5/5] x86: use dmi check to treat disabled cpus as
 hotplug cpus.

On Tue, 2010-01-12 at 17:55 -0800, Yinghai Lu wrote:
> you mean this blacklist could be too long?

yes.

> 
> switch to whitelist for the box can treat disabled cpus as hotplug
> cpus?

Do we really need all this? Systems which support physical hotplug
typically have lot's of cpu's (mostly will have atleast > 8). Even if we
really need to identify, then perhaps we can check if ACPI has any hints
regarding the physical hotplug support at boot time (we should check
with Andi Kleen or Len Brown on this).

For now, I think we can keep it simple by using the detected enabled
cpu's.

thanks,
suresh

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