From: Gautham R Shenoy <ego@in.ibm.com>
Date: Fri, 25 Jan 2008 20:08:02 +0000 (+0100)
Subject: cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
X-Git-Tag: v2.6.25-rc1~1237^2~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86ef5c9a8edd78e6bf92879f32329d89b2d55b5a;p=pandora-kernel.git

cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()

Replace all lock_cpu_hotplug/unlock_cpu_hotplug from the kernel and use
get_online_cpus and put_online_cpus instead as it highlights the
refcount semantics in these operations.

The new API guarantees protection against the cpu-hotplug operation, but
it doesn't guarantee serialized access to any of the local data
structures. Hence the changes needs to be reviewed.

In case of pseries_add_processor/pseries_remove_processor, use
cpu_maps_update_begin()/cpu_maps_update_done() as we're modifying the
cpu_present_map there.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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