From 443c6f145de813518c36ac6b6e4e08d9445337e7 Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@linux.intel.com>
Date: Wed, 23 Dec 2009 21:00:47 +0100
Subject: [PATCH] SYSCTL: Add a mutex to the page_alloc zone order sysctl

The zone list code clearly cannot tolerate concurrent writers (I couldn't
find any locks for that), so simply add a global mutex. No need for RCU
in this case.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
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