From df7c8e845e8e2030e8ae947e0ace56d184d0e9a0 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 19 Mar 2009 15:22:20 +1030
Subject: [PATCH] cpumask: remove cpumask allocation from idle_balance

Impact: fix circular locking

Steven reports a circular locking from alloc_cpumask_var doing
a wakeup. We get rid of this using the tried-and-true technique
of using a per-cpu cpumask_var_t rather than doing an alloc
every time.

Simpler and more robust than a rare, implicit allocation within
an atomic codepath.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <alpine.DEB.2.00.0903181729360.31583@gandalf.stny.rr.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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