From: Gautham R Shenoy <ego@in.ibm.com>
Date: Fri, 25 Jan 2008 20:08:01 +0000 (+0100)
Subject: cpu-hotplug: refcount based cpu hotplug
X-Git-Tag: v2.6.25-rc1~1237^2~86
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d221938c049f4845da13c8593132595a6b9222a8;p=pandora-kernel.git

cpu-hotplug: refcount based cpu hotplug

This patch implements a Refcount + Waitqueue based model for
cpu-hotplug.

Now, a thread which wants to prevent cpu-hotplug, will bump up a global
refcount and the thread which wants to perform a cpu-hotplug operation
will block till the global refcount goes to zero.

The readers, if any, during an ongoing cpu-hotplug operation are blocked
until the cpu-hotplug operation is over.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Paul Jackson <pj@sgi.com> [For !CONFIG_HOTPLUG_CPU ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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