From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 13 Oct 2008 17:15:23 +0000 (+0000)
Subject: x86: improve UP kernel when CPU-hotplug and SMP is enabled
X-Git-Tag: v2.6.27.2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f558a0f3f28dcdb969d56ce9bad1391d001c3b31;p=pandora-kernel.git

x86: improve UP kernel when CPU-hotplug and SMP is enabled

commit 649c6653fa94ec8f3ea32b19c97b790ec4e8e4ac upstream

num_possible_cpus() can be > 1 when disabled CPUs have been accounted.

Disabled CPUs are not in the cpu_present_map, so we can use
num_present_cpus() as a safe indicator to switch to UP alternatives.

Reported-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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